building a mild Daily driver 318

RustyRatRod said
Chrysler was known for terrible machining tolerances. Very tall block decks, big combustion chambers and so on. So, all that equals much lower actual compression than advertised.

I'd readily believe that given what I've seen.

Factor service/performance changes over the years in with that too- there's basically no telling what you'll really see. Just because you see a small port 2bbl on a small block doesn't mean it's a 318 or stock. Some original motors can be even less convincing in their uniformity than a motor that's so mismatched even a rebuilder wouldn't have sent it out their door. Another piece that's usually left out of the puzzle is gasket thickness- I don't think any stock gasket I've seen come off was even near the size of the average replacement. I'd be surprised if most HG changes aren't enough to knock .2 off the CR by themselves.

bigcasey123 said
when i said 400-650 range i meant for the heads alnone not the whole build lol

Buying a good set of (stock) heads, having them redone, maybe a few other valvetrain components if you did well previously, would have no trouble eating that up.

Your compression should be matched with the rest of the build. No sense building a motor that can't quite run pump gas if you just want a no-headaches reasonable motor whatever it makes. What compression you should go after should be very much related to the rest of the build. Closed chambers, larger cams, and aluminum heads allow for higher compression than their opposites will on the same fuel.

bigcasey123 said
lol i found a mopar engines pdf on google. that wasnt really my source lol
and thats crazy hat its that far off. i wouldve guessed it to be slightly lower but still arund 9:1

and If you had to guess how much does it cost to get your heads milled

318willrun already mentioned what he paid. It's going to depend as prices will not be the same at every shop or in every area.