383 pistons
Thread Starter
Instructor
Joined: Mar 2002
Posts: 140
Likes: 1
From: east hampton ct
383 pistons
Its time to order pistons for a 383 project and I am unsure what size dish to get. The engine uses 64 cc camel back heads with a XE 262 cam. In the future the engine may get a little more cam but nothing with a large amount of overlap. From the info I have it seems like a 12cc dish will get me 9.7 to 1 while a 18 cc dish will get me 9.1 to 1. Are the catalogs listing compression ratio with 0 deck height. I would like to run around 9.5 to 1. I don't care if I have to use 93 octane but I fear building a motor that has to have the timing set way back due to detonation. What should I use?
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Re: 383 pistons (28buick)
-18.
I suppose this chart needs some explanation. It shows the increase in power in % of a C/R increase. EXAMPLE: If the original CR is 9:1 on right of chart & it is increased (A line) to 12:1 (B line) on left of chart, then the increase in power is about 4.5%. If the power is increased from 9.5 to 10, the increase is about .08%.
-18 can get you 9.3 which is a good no. for your iron heads.
I suppose this chart needs some explanation. It shows the increase in power in % of a C/R increase. EXAMPLE: If the original CR is 9:1 on right of chart & it is increased (A line) to 12:1 (B line) on left of chart, then the increase in power is about 4.5%. If the power is increased from 9.5 to 10, the increase is about .08%.
-18 can get you 9.3 which is a good no. for your iron heads.
Team Owner
Joined: Sep 2003
Posts: 88,393
Likes: 2
From: eville in
Re: 383 pistons (Ganey)
i'd go with the smaller dish, if your scared of 9.7 c/r add a thicker head gasket. you may want different heads later, easier to adjust compress
ion with camber CC and head gasket thickness
ion with camber CC and head gasket thickness
