LS Ford Focus
..Thank you
I bought a set of PRC 5.3 heads to try out. I cc'ed the combustion chambers and they ended up being 63cc. I checked my PTV clearance and I am able to use a .040 headgasket. This combination gets my compression ratio back to are around the stock 9.5, which sucks.
If my head gaskets come in tomorrow I am going to try and get it back together and get some numbers by friday. Im hoping to see 20 or so hp from the heads but who knows?
Also My collectors came in today. Im gonna machine some head flanges this weekend and try to start on my new headers and exhaust next week.
I am then gonna source and new 5.3 block and start building the bottom end.

The Best V8 Stories One Small Block at Time
I swapped the new heads on and after a little tuning i made 417 whp uncorrected. My previous uncorrected number was 378whp. Pretty awesome gains for just ported heads.
I then decided to swap out the 93 octane for e85. After some tuning I made 425 uncorrected. The e85 picked up a ton of midrange power and a decent amount up top. The tune needs more work but i had to go home early.
old heads vs new on 93 octane uncorrected

e85 vs 93












