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The LSSA 7.0L is an LS7 based spec engine intended to compete against 410 sprintcar engines. The LSSA 7.0L configuration has a target power of 875 - 950 HP, and component cost of less than $40,000.
1. Block
Blocks allowed:
Block lightening of any kind is not allowed. All mounts must remain.
Oversized and roller cam bearings are not allowed.
2. Crankshaft
Crankshafts allowed:
Stroke length must be 4.000” +/-0.005”.
No lightening, counterweight knife edging, or counterweight polishing is allowed. Balancing is allowed.
3. Connecting Rods
Connecting rod length must be 6.125.
Connecting rods and bolts must be magnetic steel.
4. Pistons/Rings
Any forged or cast aluminum piston is allowed.
Engines must not exceed 14.0:1 compression ratio with the heads and gasket installed.
5. Valvetrain
Only lifters with .842 diameter are allowed.
Push rods must be maximum 3/8” diameter.
Rockers must not exceed 1.82:1 ratio.
Maximum lift at the valve is .775”.
Exhaust vales must be stainless steel, no titanium.
6. Cylinder Heads
Only the following unmodified cylinder heads per manufacture’s specification are allowed.
Angle milling, material removal or addition in any area of head is not allowed.
No porting, grinding or polishing of any kind is allowed.
The seats and guides may be replaced.
Valve springs must be magnetic steel.
7. Intake: Naturally aspirated induction only. Air intake must utilize a shared volume (not individual runner) design with no more than four throttle valves.
8. Fuel Delivery System
Two fuel delivery system types are allowed
8a. Mechanical Injection
Eight maximum injectors.
No more than one fuel metering barrel valve.
8b. Electronic Injection
Eight maximum injectors.
Engine Control Units (ECU) allowed:
Angle milling, material removal or addition in any area of head is not allowed.
No porting, grinding or polishing of any kind is allowed.
9. Fuel
Racing methanol only. Gasoline is not allowed.
Nitro, nitrous oxide, or any other oxidizer, with the exception of methanol, is not allowed.
No fuel additives, other than upper cylinder lubricants, are allowed. Fuel is subject to inspection at any time
10. Oiling System
Oiling system may be wet sump or dry sump. Dry sump systems are recommended to provide adequate scavenge capacity.
11. Ignition
11b. Electronic Spark-only control of OE style coils per plug
An MSD #6012, MSD #6014, MSD #6014CT or MSD #60143, or any ECU in section (8b.) is required.
Only OE or physically compatible OE replacement coil packs are allowed.
Only nominal 12V lithium-ion, Iron-phosphate, or NMC batteries are allowed. The battery must be securely hard mounted and shielded in the same area designated for ballast mounting. Batteries must weigh a maximum of 5 pounds. Bus voltage must read less than 14.8 V at any time.
On board starters are not allowed.
No electronic traction control devices are allowed.
The ignition firing order must remain stock LS7.
12. Exhaust:
Tri Y headers are not allowed.
Mufflers may be required per track or series rules.
13. Water Pump & Radiator
Any mechanically driven water pump is allowed.
Electric water pumps are not allowed.
14. Fuel Pump
A mechanical, belt driven, or cam driven fuel pump is allowed.
Electric fuel pumps are not allowed.
15. Exotic Materials
No Titanium, Inconel, Ceramics, DLC, or Nikasil components are allowed, except where explicitly specified.
Titanium intake valves are allowed.
Titanium valve retainers are allowed.
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