LS rebuild kits › LZ1
LZ1 Rebuild Kit
6.0L aluminum hybrid, Gen IV, AFM (2010–2013 hybrid trucks/SUVs). Every kit below is spec'd for the LZ1 specifically — not a one-size "LS1/LQ4/5.3" overhaul set — and every part is checked against the others before it ships.
★★★★★ 5.0 · 20 Google reviews · Bullet LSX Engines, Glendale AZ · 602-510-9021
Build my LZ1 kitHave us build the engineWhat's specific to the LZ1
- Two factory ring packs. LZ1 engines left GM with different pistons, so we list both ring sets (1.5 / 1.5 / 3.0mm or 1.2 / 1.5 / 2.5mm) and tell you what to measure before you order.
- AFM / DOD engine. A stock-cam refresh keeps your AFM lifters; any performance cam needs the AFM delete (non-AFM lifters, delete valley cover, plugged lifter oil galley) and an AFM-off tune — the builder adds the hardware automatically.
- Cathedral port heads, ~64cc chambers. Cams, pistons (valve-pocket angle) and rockers are matched to the port — a cathedral-port grind is the baseline.
- 58x crank reluctor. Any replacement crank or timing set keeps the signal your computer expects.
- Factory 6.098" rods. Forged-rod kits use 6.125" rods with pistons to match — we pair them so deck clearance comes out right.
- Aluminum Gen IV block — resleeve-ready. Darton MID sleeves take it to a 4.125" bore and up to a 4.125" stroke.
| Displacement | Bore × stroke | Block | Heads | Max overbore |
|---|---|---|---|---|
| 6.0L / 364 ci | 4.000" × 3.622" | Aluminum, Gen IV, AFM | cathedral port, 64cc | 4.010" |
LZ1 kits and prices
Prices are live from our builder. Open any kit in the builder to swap parts — every change is re-checked for fit.
LZ1 Refresh kit$1,441
Main, rod and cam bearings, a standard-bore ring set matched to your ring grooves, full gasket set, crank seals, oil pump and timing set — for an engine that measures in spec and needs no machining. · 10.9:1
What's in it (9 parts)
| Part | Brand / part # | Price |
|---|---|---|
| Main Bearings King SI Series Main Bearing Set, LS Gen III/IV, Standard | King Bearings · KIB-MB5293SI | $40 |
| Rod Bearings King SI Series Rod Bearing Set, LS, Standard (8) | King Bearings · KIB-CR807-SI | $29 |
| Cam Bearings Dura-Bond CHP-25 High Performance Cam Bearing Set, Gen IV LS | Dura-Bond · DUR-CHP25 | $55 |
| Piston Rings Mahle Original Premium ring set, standard 4.000" bore — 1.5 / 1.5 / 3.0mm (original Gen III 6.0 / early LS2 pistons — measure: 1.5mm top ring) | Mahle · MAH-41858CP | $81 |
| Gaskets & Seals Texas Speed gasket kit — 6.0 Gen IV cathedral (LS2 / LFA / LZ1 / LC8): head, intake, timing cover, oil pan, valley, water pump & valve cover gaskets, TSP front seal + GM rear cover with rear main seal | Texas Speed & Performance · TSP-KIT-G4-60C | $487 |
| Crank Seals Front & rear main seals — included in your gasket set (Texas Speed kit: TSP front seal + GM rear cover with seal) | Included · SEALS-GASKETSET | incl. |
| Timing Set VVT timing set for your factory VVT cam — GM 12606358 VVT cam sprocket, GM 12682000 VVT cam bolt/valve, IWIS HD seamless chain (ROL-NA-3SR60-2), GM 12626407 VVT tensioner, GM 12556582 crank sprocket | Bullet LSX Engines · BLSX-VVT-TIMING | $486 |
| Oil Pump Melling High Pressure Oil Pump, 97+ LS | Melling · MEL-10295 | $156 |
| Assembly Lube, Plastigage & Break-in Oil Assembly supplies: Royal Purple Max-Tuff Assembly Lube + Plastigage green (.001"–.003"), 2 strips + Driven BR30 5W-30 Break-In Oil, 6 quarts | Royal Purple / Sealed Power / Driven Racing · RYP-41330, SLP-SPG1-2, DRV-01806-6 | $107 |
Refresh kit: check bearing clearances, ring end gaps and cam/lifter wear at install — parts are standard size for an engine that doesn't need machining
LZ1 Refresh + cam kit$2,446
Everything in the refresh kit plus a cam picked for your heads, valve springs, lifters, pushrods and a rocker trunnion upgrade. · est. 475 hp · 10.9:1
What's in it (17 parts)
| Part | Brand / part # | Price |
|---|---|---|
| Main Bearings King SI Series Main Bearing Set, LS Gen III/IV, Standard | King Bearings · KIB-MB5293SI | $40 |
| Rod Bearings King SI Series Rod Bearing Set, LS, Standard (8) | King Bearings · KIB-CR807-SI | $29 |
| Cam Bearings Dura-Bond CHP-25 High Performance Cam Bearing Set, Gen IV LS | Dura-Bond · DUR-CHP25 | $55 |
| Piston Rings Mahle Original Premium ring set, standard 4.000" bore — 1.5 / 1.5 / 3.0mm (original Gen III 6.0 / early LS2 pistons — measure: 1.5mm top ring) | Mahle · MAH-41858CP | $81 |
| Gaskets & Seals Texas Speed gasket kit — 6.0 Gen IV cathedral (LS2 / LFA / LZ1 / LC8): head, intake, timing cover, oil pan, valley, water pump & valve cover gaskets, TSP front seal + GM rear cover with rear main seal — less the timing cover gasket & front seal, valley gasket (comes with your new cover) | Texas Speed & Performance · TSP-KIT-G4-60C | $360 |
| Crank Seals Front & rear main seals — included in your gasket set (Texas Speed kit: TSP front seal + GM rear cover with seal) | Included · SEALS-GASKETSET | incl. |
| Camshaft TSP OnDGas Stage 1 Camshaft | Texas Speed & Performance · TSP-OnDGas-Stg1 | $420 |
| Valve Spring Kit TSP VS2225 .625" LS Beehive Valve Springs (16) — uses your stock retainers & locks | Texas Speed & Performance · TSP-VS2225-16 | $227 |
| Timing Set Rollmaster LS3 Single-Roller Timing Set, 4x, 3-bolt cam | Rollmaster · ROL-NA-CS1190 | $184 |
| Lifters GM/Delphi LS7-Style Lifters, Set of 16 | GM · DEL-25341990-16 | $210 |
| Pushrods TSP 7.400" 5/16" chromoly pushrods, Set of 16 — standard LS length | Texas Speed & Performance · TSP-7400-16 | $127 |
| Rocker Arms TSP trunnion upgrade kit for your stock GM rockers (LS / LT) — you or your shop press them in | Texas Speed & Performance · TSP-TrunnionUpgrade | $150 |
| Oil Pump Melling High Pressure Oil Pump, 97+ LS | Melling · MEL-10295 | $156 |
| Valley Cover TSP Gen IV valley cover with PCV (like GM 12599296 LS3) — non-AFM; the standard AFM/DOD delete cover for Gen IV engines | Texas Speed & Performance · TSP-LS3-VC | $120 |
| Timing Cover GM Gen IV LS2/LS3 Timing Cover Assembly, Non-VVT — complete with gasket & seal; the VVT delete cover | GM · GM-12633906 | $135 |
| Assembly Lube, Plastigage & Break-in Oil Assembly supplies: Royal Purple Max-Tuff Assembly Lube + Plastigage green (.001"–.003"), 2 strips + Driven BR30 5W-30 Break-In Oil, 6 quarts | Royal Purple / Sealed Power / Driven Racing · RYP-41330, SLP-SPG1-2, DRV-01806-6 | $107 |
| Required GM 12588670 LS2 timing chain dampener (GM-12588670) — the tensioner for every non-VVT timing set | $44 |
Your engine has AFM/DOD — a performance cam needs the AFM delete (non-AFM lifters, delete valley cover, plugged lifter oil galley) and an AFM-off tune
Refresh kit: check bearing clearances, ring end gaps and cam/lifter wear at install — parts are standard size for an engine that doesn't need machining
LZ1 Rebuild parts kit$1,655
For a block that gets machined: everything to rebuild it at stock power, with a spec sheet for your machine shop. Keeps your crank, rods, pistons and heads. · est. 425 hp · 10.9:1
What's in it (18 parts)
| Part | Brand / part # | Price |
|---|---|---|
| Main Bearings King SI Series Main Bearing Set, LS Gen III/IV, Standard | King Bearings · KIB-MB5293SI | $40 |
| Rod Bearings King SI Series Rod Bearing Set, LS, Standard (8) | King Bearings · KIB-CR807-SI | $29 |
| Cam Bearings Dura-Bond CHP-25 High Performance Cam Bearing Set, Gen IV LS | Dura-Bond · DUR-CHP25 | $55 |
| Piston Rings Mahle Original Premium ring set, standard 4.000" bore — 1.5 / 1.5 / 3.0mm (original Gen III 6.0 / early LS2 pistons — measure: 1.5mm top ring) | Mahle · MAH-41858CP | $81 |
| Crank Seals TSP front crank seal — rear main seal comes installed in your new GM rear cover | Texas Speed & Performance · TSP-FCS-ONLY | $20 |
| Block Plugs Summit LS Block Plug Kit — threaded coolant & oil plugs, oil plug & barbell, Gen III/IV (SUM-G1584) | Summit Racing · SUM-G1584 | $18 |
| Head Gaskets TSP OE-Style LS2/LQ4 6.0L Head Gasket .051", 4.040" Bore (pair) | Texas Speed & Performance · TSP-HG9227 | $110 |
| Head Studs / Bolts TSP Gen IV Cylinder Head Bolt Kit | Texas Speed & Performance · TSP-HB0568-KIT | $80 |
| Valve Spring Kit No spring kit needed — your cam runs the factory valve springs | Bullet LSX Engines · NO-SPRING-KIT | incl. |
| Cam Retainer Plate TSP LS Camshaft Retainer Plate & Bolts Kit | Texas Speed & Performance · TSP-CP9016 | $28 |
| Timing Set VVT timing set for your factory VVT cam — GM 12606358 VVT cam sprocket, GM 12682000 VVT cam bolt/valve, IWIS HD seamless chain (ROL-NA-3SR60-2), GM 12626407 VVT tensioner, GM 12556582 crank sprocket | Bullet LSX Engines · BLSX-VVT-TIMING | $486 |
| Lifter Trays GM LS2/LS3/LS7/L98 Lifter Trays (set of 4) | GM · GM-12595365-4 | $49 |
| Rocker Arms TSP trunnion upgrade kit for your stock GM rockers (LS / LT) — you or your shop press them in | Texas Speed & Performance · TSP-TrunnionUpgrade | $150 |
| Oil Filter ACDelco PF48 Oil Filter — standard LS, fits every LS block | ACDelco · ACD-PF48 | $9 |
| Oil Pump Melling High Pressure Oil Pump, 97+ LS | Melling · MEL-10295 | $156 |
| Rear Main Cover GM LS Rear Cover Assembly — new plate with rear main seal, gasket & bolts (LS1/LS2/LS3/LS6/LS7) | GM · GM-12639250 | $80 |
| Cover Gaskets Cover gaskets: LS valve cover gaskets (pair) + Gen IV valley cover gasket & O-ring kit + LS timing cover gasket + LS oil pan gasket (upper pan to block) | Cometic / Texas Speed & Performance · CometicValveCoverGasket, TSP-Valley0141, CometicLSTimingCoverGasket, COM-C5173 | $157 |
| Assembly Lube, Plastigage & Break-in Oil Assembly supplies: Royal Purple Max-Tuff Assembly Lube + Plastigage green (.001"–.003"), 2 strips + Driven BR30 5W-30 Break-In Oil, 6 quarts | Royal Purple / Sealed Power / Driven Racing · RYP-41330, SLP-SPG1-2, DRV-01806-6 | $107 |
Re-used from your engine: Crankshaft, Connecting Rods, Pistons, Cylinder Heads, Camshaft, Lifters, Pushrods, Oil Pan Package, Valley Cover, Timing Cover, Valve Covers, Harmonic Balancer.
LZ1 Forged bottom-end kit$4,314
Your crank with forged rods and forged pistons, bearings, rings, gaskets and oiling — ready for a big cam or boost. · est. 500 hp · 10.6:1
What's in it (25 parts)
| Part | Brand / part # | Price |
|---|---|---|
| Main Bearings Clevite P-Series Main Bearing Set MS-2199P, LS Gen III/IV, Standard | Clevite · Clevite P series main LS | $108 |
| Connecting Rods Summit Racing Pro LS H-Beam 6.125" Rods, .927" floating pin, ARP 2000 bolts, stroker clearanced, Set of 8 | Summit Racing · SUM-LS6125927 | $700 |
| Rod Bearings Clevite P-Series Rod Bearing Set CB-663P(8), LS, Standard | Clevite · Clevite P series rod LS | $38 |
| Pistons CP-Carrillo Bullet LS Piston Set (8) — 4.005" bore, 3.622" stroke, 6.125" rod, -2.7cc flat top, pins & steel top-ring set | CP-Carrillo · BLS1011-005 | $956 |
| Cam Bearings Dura-Bond CHP-25 High Performance Cam Bearing Set, Gen IV LS | Dura-Bond · DUR-CHP25 | $55 |
| Crank Seals TSP front crank seal — rear main seal comes installed in your new GM rear cover | Texas Speed & Performance · TSP-FCS-ONLY | $20 |
| Block Plugs Summit LS Block Plug Kit — threaded coolant & oil plugs, oil plug & barbell, Gen III/IV (SUM-G1584) | Summit Racing · SUM-G1584 | $18 |
| Head Gaskets TSP OE-Style LS2/LQ4 6.0L Head Gasket .051", 4.040" Bore (pair) | Texas Speed & Performance · TSP-HG9227 | $110 |
| Head Studs / Bolts TSP Gen IV Cylinder Head Bolt Kit | Texas Speed & Performance · TSP-HB0568-KIT | $80 |
| Camshaft TSP 220R Camshaft, 220/220 .600"/.600" 112 LSA | Texas Speed & Performance · TSP-220R6112 | $420 |
| Valve Spring Kit TSP .660" Polished Dual Spring Kit — PAC springs, titanium retainers, PRC integrated seat/seals (16) | Texas Speed & Performance · TSP-PACPOL660SPRINGKIT | $360 |
| Cam Retainer Plate TSP LS Camshaft Retainer Plate & Bolts Kit | Texas Speed & Performance · TSP-CP9016 | $28 |
| Timing Set Rollmaster LS3 Single-Roller Timing Set, 4x, 3-bolt cam | Rollmaster · ROL-NA-CS1190 | $184 |
| Lifters GM/Delphi LS7-Style Lifters, Set of 16 | GM · DEL-25341990-16 | $210 |
| Lifter Trays GM LS2/LS3/LS7/L98 Lifter Trays (set of 4) | GM · GM-12595365-4 | $49 |
| Pushrods TSP 7.400" 5/16" chromoly pushrods, Set of 16 — standard LS length | Texas Speed & Performance · TSP-7400-16 | $127 |
| Rocker Arms TSP trunnion upgrade kit for your stock GM rockers (LS / LT) — you or your shop press them in | Texas Speed & Performance · TSP-TrunnionUpgrade | $150 |
| Oil Filter ACDelco PF48 Oil Filter — standard LS, fits every LS block | ACDelco · ACD-PF48 | $9 |
| Oil Pump Melling High Pressure Oil Pump, 97+ LS | Melling · MEL-10295 | $156 |
| Valley Cover TSP Gen IV valley cover with PCV (like GM 12599296 LS3) — non-AFM; the standard AFM/DOD delete cover for Gen IV engines | Texas Speed & Performance · TSP-LS3-VC | $120 |
| Timing Cover GM Gen IV LS2/LS3 Timing Cover Assembly, Non-VVT — complete with gasket & seal; the VVT delete cover | GM · GM-12633906 | $135 |
| Rear Main Cover GM LS Rear Cover Assembly — new plate with rear main seal, gasket & bolts (LS1/LS2/LS3/LS6/LS7) | GM · GM-12639250 | $80 |
| Cover Gaskets Cover gaskets: LS valve cover gaskets (pair) + LS oil pan gasket (upper pan to block) | Cometic · CometicValveCoverGasket, COM-C5173 | $50 |
| Assembly Lube, Plastigage & Break-in Oil Assembly supplies: Royal Purple Max-Tuff Assembly Lube + Plastigage green (.001"–.003"), 2 strips + Driven BR30 5W-30 Break-In Oil, 6 quarts | Royal Purple / Sealed Power / Driven Racing · RYP-41330, SLP-SPG1-2, DRV-01806-6 | $107 |
| Required GM 12588670 LS2 timing chain dampener (GM-12588670) — the tensioner for every non-VVT timing set | $44 |
Re-used from your engine: Crankshaft, Cylinder Heads, Oil Pan Package, Valve Covers, Harmonic Balancer.
Your engine has AFM/DOD — a performance cam needs the AFM delete (non-AFM lifters, delete valley cover, plugged lifter oil galley) and an AFM-off tune
Pistons are 4.005" — your machine shop bores and hones the block to match (not part of this kit)
LZ1 Stroker kit$6,993
Forged 4.000" crank (4.125" on the LS7), forged rods and pistons, bearings, gaskets and oiling — the most cubic inches your block takes. · est. 570 hp · 10.9:1
What's in it (28 parts)
| Part | Brand / part # | Price |
|---|---|---|
| Crankshaft TSP 4340 Forged LS Crankshaft, 4.000" Stroke, 2.100" Pin, 6-Bolt, Wet Sump | Texas Speed & Performance · TSP-4002100WR-X | $969 |
| Main Bearings King XP Series Main Bearing Set, LS Gen III/IV, Standard | King Bearings · KIB-MB5013XP | $126 |
| Connecting Rods Summit Racing Pro LS H-Beam 6.125" Rods, .927" floating pin, ARP 2000 bolts, stroker clearanced, Set of 8 | Summit Racing · SUM-LS6125927 | $700 |
| Rod Bearings King XP Series Rod Bearing Set, LS, Standard (8) | King Bearings · KIB-CR807XPN | $70 |
| Pistons CP-Carrillo Bullet LS Piston Set (8) — 4.010" bore, 4.000" stroke, 6.125" rod, -8cc dish, pins & steel top-ring set | CP-Carrillo · BLS1117-010 | $1,016 |
| Cam Bearings Dura-Bond CHP-25 High Performance Cam Bearing Set, Gen IV LS | Dura-Bond · DUR-CHP25 | $55 |
| Crank Seals TSP front crank seal — rear main seal comes installed in your new GM rear cover | Texas Speed & Performance · TSP-FCS-ONLY | $20 |
| Block Plugs Summit LS Block Plug Kit — threaded coolant & oil plugs, oil plug & barbell, Gen III/IV (SUM-G1584) | Summit Racing · SUM-G1584 | $18 |
| Head Gaskets TSP OE-Style LS2/LQ4 6.0L Head Gasket .051", 4.040" Bore (pair) | Texas Speed & Performance · TSP-HG9227 | $110 |
| Head Studs / Bolts TSP Gen IV Cylinder Head Bolt Kit | Texas Speed & Performance · TSP-HB0568-KIT | $80 |
| Camshaft TSP Cathedral Stroker Cam, Stage 1, 235/250 — 402+ ci cathedral | Texas Speed & Performance · TSP-CathStroker-Stg1 | $420 |
| Valve Spring Kit TSP .660" Polished Dual Spring Kit — PAC springs, titanium retainers, PRC integrated seat/seals (16) | Texas Speed & Performance · TSP-PACPOL660SPRINGKIT | $360 |
| Cam Retainer Plate TSP LS Camshaft Retainer Plate & Bolts Kit | Texas Speed & Performance · TSP-CP9016 | $28 |
| Timing Set Rollmaster LS3 Single-Roller Timing Set, 4x, 3-bolt cam | Rollmaster · ROL-NA-CS1190 | $184 |
| Lifters GM/Delphi LS7-Style Lifters, Set of 16 | GM · DEL-25341990-16 | $210 |
| Lifter Trays GM LS2/LS3/LS7/L98 Lifter Trays (set of 4) | GM · GM-12595365-4 | $49 |
| Pushrods TSP 7.400" 5/16" chromoly pushrods, Set of 16 — standard LS length | Texas Speed & Performance · TSP-7400-16 | $127 |
| Rocker Arms TSP trunnion upgrade kit for your stock GM rockers (LS / LT) — you or your shop press them in | Texas Speed & Performance · TSP-TrunnionUpgrade | $150 |
| Oil Filter ACDelco PF48 Oil Filter — standard LS, fits every LS block | ACDelco · ACD-PF48 | $9 |
| Oil Pump Melling High Pressure Oil Pump, 97+ LS | Melling · MEL-10295 | $156 |
| Oil Control — Baffle, Windage Tray & Crank Scraper Improved Racing EGM-241 aluminum windage tray — clears up to a 4.000" stroke with factory or aftermarket rods; most factory LS pans, GM retro-fit pan and Holley 302-1; factory or ARP main studs | Improved Racing · IRP-EGM-241 | $149 |
| Valley Cover TSP Gen IV valley cover with PCV (like GM 12599296 LS3) — non-AFM; the standard AFM/DOD delete cover for Gen IV engines | Texas Speed & Performance · TSP-LS3-VC | $120 |
| Timing Cover GM Gen IV LS2/LS3 Timing Cover Assembly, Non-VVT — complete with gasket & seal; the VVT delete cover | GM · GM-12633906 | $135 |
| Rear Main Cover GM LS Rear Cover Assembly — new plate with rear main seal, gasket & bolts (LS1/LS2/LS3/LS6/LS7) | GM · GM-12639250 | $80 |
| Cover Gaskets Cover gaskets: LS valve cover gaskets (pair) + LS oil pan gasket (upper pan to block) | Cometic · CometicValveCoverGasket, COM-C5173 | $50 |
| Assembly Lube, Plastigage & Break-in Oil Assembly supplies: Royal Purple Max-Tuff Assembly Lube + Plastigage green (.001"–.003"), 2 strips + Driven BR30 5W-30 Break-In Oil, 6 quarts | Royal Purple / Sealed Power / Driven Racing · RYP-41330, SLP-SPG1-2, DRV-01806-6 | $107 |
| Required PRC CNC porting of core heads (cathedral port) [PRC LS6 Porting Service] — mail-in, heads ship to PRC | $1,450 | |
| Required GM 12588670 LS2 timing chain dampener (GM-12588670) — the tensioner for every non-VVT timing set | $44 |
Re-used from your engine: Cylinder Heads, Oil Pan Package, Valve Covers, Harmonic Balancer.
Your engine has AFM/DOD — a performance cam needs the AFM delete (non-AFM lifters, delete valley cover, plugged lifter oil galley) and an AFM-off tune
Pistons are 4.010" — your machine shop bores and hones the block to match (not part of this kit)
Questions
What's in a LZ1 refresh kit?
Main, rod and cam bearings, a standard-bore ring set matched to the LZ1's ring grooves, a full gasket set, crank seals, an oil pump and a timing set. Anything you want to keep — covers, oil pan, balancer — you mark "re-use mine" at no charge.
Which piston rings fit a LZ1?
Mahle Original Premium ring set, standard 4.000" bore — 1.5 / 1.5 / 3.0mm (original Gen III 6.0 / early LS2 pistons — measure: 1.5mm top ring) — or — Mahle Original Premium ring set, standard 4.000" bore — 1.2 / 1.5 / 2.5mm (Gen IV 6.0, and late/replacement LQ4-LQ9-LS2 pistons — measure: 1.2mm top ring)
Can I just buy the parts and have my own shop build it?
Yes — every kit drop-ships from our suppliers and comes with a machine-shop spec sheet (bore, deck, clearances) and assembly torque specs. Or have Bullet LSX Engines machine and build it in Glendale, AZ.
How do I find my RPO code?
It's on the Service Parts Identification sticker (glove box, console lid or spare-tire cover), or match the 8th digit of the VIN.