My Leaning Tower
It is 10 to 1 compression. The guy that built the engine is Randy McDowell at Power Tech Racing engines in Ashland Ky. He has built engines for track and drag strip for over 30 years. He can build engines and make them within 2 to 3 horsepower just form the formulas he uses to build them. Its was 8:9:1 from the factory with dished pistons. Those pistons are 40 over flat tops. Plus how many engines have you built?
No one is raggin on your engine, man, so there's no need to get defensive or insulting. Unless your engine's pistons were not all the way to the top of the bore, that engine has at least .100" deck clearance. In other words, the pistons sit .100" down in the bore. Unless you're going to run an outside power adder such as forced induction or nitrous, you'll not get to 325 HP. Here's the deal there. The cylinder head on the slant six is the limiting factor. It was designed around the 170 and never redesigned around the 198 or the 225, so the larger engines got the 170 cylinder head. There's no amount of work you can do to a slant six head to achieve 325HP naturally aspirated and carbureted at your compression ratio level. You'd have to build a slant six so radical that it would not run on pump gas. A 13.5:1 225 bored .100 over with zero deck pistons and a totally ported head with huge valves and an equally huge camshaft MIGHT do it. Then again, it might not.
We're not raggin on your build I think it's nice. But if you've been told by someone that it's going to churn out 325HP, it ain't happenin. Also, "I seriously doubt" it has anywhere near 10.1 compression. Those pistons sit a LONG way in the hole at TDC. Even if the head's been milled so the combustion chamber is totally FLAT, you're not getting to 10.1, not happenin.
Now.......before you smart me off and ask me how many engines I've built, my answer is "I don't know" A damn LOT, I can tell you that. DO I know everything? Hell no I'm learning everyday, but I know what I've told you is correct. If you've paid for all you say someone has told you, my advice to you is to do your own research, measure your own compression. You'll find out the information you've been given is incorrect.
Again, we're not trying to rag on your build. I'm building a slant right now. We love them. We're trying to help you. The best thing to do is listen.
