Langadorf

I'm trying to identify which brand pistons I have and what sorta spec they have. I think they might be TRWs but don't know for sure. The only marking I can see on the top of the pistons are the numbers L2491. There are also some smaller numbers on them but they are different on every piston. The pistons are flat top with 2 valve reliefs. Any help would be appreciated.

Thanks

gravismaximus

did you try calling jegs, or summit and see if the numbers match anything. also just so you now those valve relifes are called eyebrows, good luck :chevy

jackson

L2491 is an aftermarket TRW/Speed-Pro forged piston with comp dist 1.430 and is flat top but has minus (-) 3.4cc volume. For a 5.7" rod in 4" bore with 3.75" stroke. Makes 377" or 383" or 388" stroker (depending if they're std or 0.030 or 0.060). 30 over makes 9.5:1 w/ 76cc heads or 10.75:1 w/ 64 cc heads ... also depending on deck height & gasket. Basically a very good stroker piston.

PS with a std 9.025" deck height, this piston will be 0.020" down in the hole.




[Modified by jackson, 12:51 AM 9/25/2002]

Langadorf

Thanks for the info!