Quote:

Quote:

https://board.moparts.org/ubbthreads/show...rue#Post4933738

Use eigher a KB162 piston or a 2316 Federal mogul/TRW to keep your compression height correct. Anything less than these are a waist of money and super-low compression. Even with these pistons and an 85CC or so head, your barely at 9:1.

Follow the link on a Purestock 383 thread.



NEITHER of these pistons will get you the CORRECT compression height , the KB162 is deeper in the hole than the 2315 AND it's got a CANYON LIKE valve relief at 5cc .





I am running 162's and with the first build on ported 906's the car ran like crap. On teardown for the 2nd build we found 7.8:1 compression along several other issues!!! DO NOT believe the calculators and ESPECIALLY the magazine articles.

Running the same pistons with 516's with a fair amount of work and a more properly matched cam and a calculated and verified 9.2:1 comp ratio and the motor is no longer an issue for me. 400 on the nose for hp and 430+ tq. Not land speed records here, but a good motor for the street that does fine for cruising around town.

And definately make sure this builder knows mopars. Most of them SAY they do becasue they want the business, but a good one will take the time to listen and maybe even show you the various stages of the rebuild. This is very important!

'73 GK6 Challenger Rallye - 340 4-Speed