383 piston selection

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Apr 18, 2004 | 03:58 PM

#31

rskrause

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Joined: Dec 1969

Posts: 10,745

From: Buffalo, New York

Quote:

Originally posted by speedmiser
I'm in a similar boat with my 383 rebuild build - I've selected my cam, pistons and heads and want a compression ratio where I can stay on pump gas when N/A, but run a race gas mix (or all race gas if neccesssary) when spraying 250-300 shot.

Cam 236/248 comp XE on 114 - with 1.7/1.6 rockers 600/600 lift
Wiseco flat tops - 5.4 cc dish (valve reiefs actually)
5.7 rod
61cc chamber AFR LT4

Problem is, when my engine was orginally built 5 years ago, neither I, nor the machinist remebers if the block has been decked. I dont think it has, so I'd like to take it to .005 this time, but I've got to make sure it will live at zero.

Rich - can you tell me what the DCR would be with .005 and 0.0 deck height?

I've calculated the static to be 11.315 and 11.46 respectively.

Any help would be appreciated.

BTW - I'm currently running the 236/248 cam, and am pretty fixed on the rod and piston choice - but the head chambers can be 56-74, as long as I dont wait to long to place the order change.

I get 8.64 with zero deck and 8.54 with a deck of 0.005". That's with a 0.040" gasket. I assumed a 112 degree LSA and a 108 degree intake center line.

Rich

Last edited by rskrause; Apr 18, 2004 at 04:02 PM.