High compression with aluminum heads and pump gas???????

Mad "Who determines that 11:1 is high compression?

Who determines a 6.123 is a long rod?

Compression is neither high or low. It is what it is. Just like rod length. "

71DodgeDemon340 said

How does he know nothing, i told him i wanted a strong street car to run on pump gas, and he suggested to stay around 10:1 comp, maybe he was just being on the conservative side, he suggested to shoot for 10:1 comp and not run a higher amount of comp

He is a reputable engine builder and builds engines for people all over the country, also has built a couple engines for baja racers

I guess what made him originally say that is i was going to use iron heads but they failed the leakdown test and leaked between the valve seat and head, so had to go the aluminum route

Click to expand...

Answer to both these is the OP's builder.
71 - If you want information on what many others are doing, or to understand how the parts combine to make an eingine run a certain way, it's a good post. If you're looking to validate what your guy said to you, it's hard because there are those of us that might push things higher, and others that would say you builder is nuts for going that high...lol. If you trust your builder, let him guide you. Ultimately you pay him, and if you're not happy he has to deal with you on it.

edit: - your original question was what do you look for for issues: cam choice, piston choice, and down the road timing andd carburetion tuning all are areas to watch out for.