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Tim H 05-18-2018 12:51 PM
Class Racer Info
 
Using the very helpful site that Dwight has provided, I have a question regarding piston compression height. As an example one of the listed repl. pistons for a 1969 Chevy 350/300 is the TRW L2256F. TRW lists the compression height @ 1.563 " however the NHRA tech spec is 1.535". I am missing something ?

Race Clean 05-18-2018 02:37 PM
Re: Class Racer Info
 
No,only that you are good by .002 on that part of the side
You can still get the desired Deck clearance!

jmantle 05-21-2018 04:56 PM
Re: Class Racer Info
 
Quote:
Originally Posted by Tim H (Post 563382)
Using the very helpful site that Dwight has provided, I have a question regarding piston compression height. As an example one of the listed repl. pistons for a 1969 Chevy 350/300 is the TRW L2256F. TRW lists the compression height @ 1.563 " however the NHRA tech spec is 1.535". I am missing something ?
NHRA lists the minimum accepted pin height. Most replacement pistons will exceed this dimension but still give you room to deck the block.

Jim Mantle V/SA 6632


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