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Instruction Sheets for Part Number SUM-PR36L07012
Summit Racing™ Pro LS Piston and Rod Kits SUM-PR36L07012
Part Number: SUM-PR36L07012
Summit Racing™ Pro LS Piston and Rod Kits
Pro LS 4340 Piston and Rod Kit, 377 Cid., 4.070 bore, 3.622 stroke, 6.125 rod, 12cc dish, 9.9:1 @ 65cc, 9.4:1 @ 70cc, File-Fit Rings
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Estimated Ship Date: Monday 10/19/2026 Would you rather pick it up?
Kit/Combo Contents
Summit Racing SUM-136SN9045070 - Summit Racing™ Pro LS Piston Rings
Piston Rings, Gas Nitrided Steel Top, Martensitic Ductile Napier second, Std. Tension oil, File fit for 4.070 in. bore, 1.2mm, 1.2mm, 3.0mm, Set
Kit Item Quantity: 1
Summit Racing SUM-299927407012 - Summit Racing™ Pro LS Forged Pistons
Pro LS 2618 Forged Piston, 4.070 bore, 1.299 C.H., 12cc Dish, Std. Stroke, 6.125 .927 Rod, NA/Boost/Nitrous, Cathedral/Rect. 6.2 LS3 L92 LS9, Set of 8
Kit Item Quantity: 1
Summit Racing SUM-LS6125927 - Summit Racing™ Pro LS Connecting Rods
Pro LS 4340 Forged Steel H-Beam Connecting Rod, 6.125 in. Length, .927 Floating Pin, ARP 2000 7/16 in. 12 pt. Bolts, Stroker Clearanced, LS1, Set of 8
Kit Item Quantity: 1
Overview
Brand:
Manufacturer's Part Number:
SUM-PR36L07012
Part Type:
Product Line:
Summit Racing Part Number:
SUM-PR36L07012
Actual Engine Displacement:
6.2L/377
Bore (in.):
4.070 in.
Bore (mm):
103.380mm
Engine Stroke (in.):
3.622 in.
Balanced:
No
Piston Material:
Forged aluminum
Piston Style:
Dish, with two valve reliefs
Harmonic Balancer Included:
No
Flexplate Included:
No
Flywheel Included:
No
Pistons Included:
Yes
Piston Head Volume (cc):
+12.00cc
Wrist Pin Style:
Press-fit or floating
Piston Rings Included:
Yes
Piston Ring Facing Material:
Nitride
Piston and Ring Oversize (in.):
0.005 in.
Piston and Ring Oversize (mm):
0.130mm
Crankshaft Included:
No
Connecting Rods Included:
Yes
Connecting Rod Length Center to Center (in.):
6.125 in.
Connecting Rod Material:
Forged 4340 steel
Connecting Rod Beam Style:
H-beam
Rod Bearings Included:
No
Main Bearings Included:
No
Cam Bearings Included:
No
Gaskets Included:
No
Oil Pump Included:
No
Camshaft Included:
No
Lifters Included:
No
Timing Chain and Gears Included:
No
Plastigage Included:
No
Assembly Lubricant Included:
No
Quantity:
Sold as a kit.
Notes:
File-fit rings included. Optional thick tool steel pin upgrade recommended at 1,000 hp boosted or 300+ nitrous. (see recommended parts tab)
Summit Racing™ Pro LS Piston and Rod Kits
Summit Racing™ Pro LS piston and rod kits deliver industry-leading fit, finish, and durability at an affordable price. These assemblies are tested to over 1,200 hp in turbo applications. They're available in a broad range of fitment and performance options.
Standard features and specs may include:
* 4340 forged H-beam connecting rods
* Designed for 5,000 ft./min. average piston speed in street and drag applications
* 7/16 ARP 2000 rod bolts with 200,000 psi tensile strength; dual-ribbed caps for maximum strength
* Added stroker clearance and balanced to within +/- 1 gram per end
* Full-floating and precision-honed in the USA to +/- .0001 in.
* 2618 forged aluminum pistons
* Ultra-modern 2618 alloy forgings for boost and nitrous with maximum ring land thickness
* Pressure-fed pin oiling with durable chromium steel wrist pins
* Specially profiled and coated piston skirts for stroker applications with tight piston-to-wall clearance
* Generous valve reliefs for extra piston-to-valve clearance accommodate cathedral and rectangle heads
* Precision wrist pins and retainers
* Premium steel piston rings
* Steel top rings designed for maximum life with boost and nitrous
* File-fit rings for maximum ring seal, reduced friction, and tensions optimized for wet-sump engines
* Martensitic ductile Napier-hook second rings for strength and maximum oil control
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