Looking to find out how much of a difference heads with 51cc chambers would make on stock compression. I plan on using the thinner Impala gaskets to bump compression back up a little. Im looking at a set of heads/intake right now but I do not intend to supercharge/turbo, nor will anything be done with pistons for now to bump compression back up.

Aaron

 

51cc and a .026 gasket are going to make a big jump..... try the compression calculator.

 

12.1:1 .... that's a little steep my friend.

 

I guess Im a little confused. I thought the stock chambers were 48, and by increasing the chamber size to 51, wouldn't that lower my compression?

Aaron

 

Stock is more like 54 or so they vary, 51cc takes some milling. I am going to a 51.3 cc chamber with the Mr. Gasket .026 and am coming out with 11.5+ on a stock shortblock. See you at WIR after it is all back together, if the tuning goes well the May 5th RSD might be the first pass for the new combo.

 

Cool sounds good, I will see you there. What kind of heads are you going with. Stock castings? Who are you having port them?

Aaron

 

I am running a 48cc chamber...with stock short block and stock thickness gasket I was ~11.5:1

 

I had my heads cut down to 50.5cc combustion chambers and I used Felpro 0.039" head gaskets. It came to somewhere around 11.86CR on the stock shortblock according a compression calculator. This setup lasted 2 years shifting at 6800rpm. The engine cant take it, just make shure you run good gas in it all the time.

 

You guys going smaller on the chamber and using the Felpro or stock gaskets are doing it wrong. The ONLY way I would consider using the Felpro gasket would be on a block that is zero decked or VERY near zero. If you don't understand why I say this do a search on "quench" very important when trying to safely run high compression. Stock the pistons are .015-.025 down most being closer to the .025 number add a .026 gasket like the Mr. Gasket or Victor Rienz and you still have a far from optimal .051 quench thicker gaskets just make it worse.