LS-6 camshaft

[Chevy454]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bbbentley</div><div class="ubbcode-body">I did say it was a 375hp. That is 11.0:1. It is &quot;bone&quot;stock. Non modified 840 heads,4346 Holley,stock exhaust with transverse muffler. F70x14 bias ply tires. I do have an xtra rear end that has 4.88s,but hesitant to change as it is a later date casting. 3.31 is original.Car has traction bars. </div></div>
If its &quot;bone stock&quot; then you'd be darn lucky to actually be at 11:1 compression...the 840 chambers are bigger than the 108cc listed, the domes aren't 34cc, the deck height will be off, and most folks don't run the steel shim head gaskets. When I cc'd our L72 it came in at 10.2:1, and that was after a slight surfacing of the heads...and I know a guy that tore down an original L72 and it came in at 9.8:1.

My advice, go in hoping for low 13s, that way anything better is gravy...