The 49 cc stuff is decent, but it’s flat milled, and there’s only about 50 Thousands left to angle mill. We got a set on that 303” they’re good, but if I had to do it over, I’d go with a 64 cc and angle mill them. Now, RHS makes a 49 cc 215 intake runner that is angle milled to 21 degree. But, they quit making them, but they can still be found. It’s a raised runner head. Good head. AFR has some great choices also. Brodix and Dart do too. I’d go with aluminum if that ain’t a problem. Don’t go huge on the runner size. You won’t like it.Thanka for the info. I will send bill miller and email.
I have tried to guess at the heads but really i think the bottom end needs to be built first then i can pick the heads out.
I am looking at the best pricing option that will get me around where the flow looks like it needs to be. Maybe ported eq heads or something that can be milled down enough. The only small chamber heads i could find were darts that come 49cc in an angle plug.
I have emailed some head porters from this forum and just waiting to hear back.
Ya it does i wouldnt have guessed those numbers.
I was getting my headflow recomendation from the calculators on wallace racing websight and figures about 255cfm up to 315(for max output 127.5%ve)And i just picked an off the shelf cam that i could find online and did the math for dynamic compression to allow me to run pump gas.
I imagen that pipemax programme is picking the optimal compression thats why the numbers are high and the recomended octane is 106?
Static Compression Ratio = 11.964So woth 11.9comp ratio its recomending 106? Dam thats higher then i would have hoped. Does it correct for dynamic compression or just static?
That thing, with that much head, needs a set of pistons, and a real cam, and it would make over 600 hp. Still a good piece. That’s the largest head I’d run a that cubic inch engine. The largest runner head in 23 degree figuration, on under 300” that I ran successfully, was 215 cc intake runner. But others have done well with larger heads, so who knows.
you may wish to revise spring pressure recommendations he wants a solid F/T camYou’ll be fine. And again, if running a 23 degree head, run the long rod. 8,500 rpm in that thing won’t be a problem. And the good stud mount rockers will handle that fine. You won’t need over 240#’s on the seat for pressure, and rockers made today handle that fine. Run 7/16 studs, and a girdle. Run lash caps.
Oh, they would be. Night and day difference today.Had a buddy (now deceased) who built 307's instead of 283's in the 70's. He said he like the extra torque and it would still spin to 7500 with the old shitty heads from back then. They were all 12 to 1 engines and with today's heads, cams and intakes might be a real HP screamer today.
I just took a 307 out of my son-in-law’s car, and replaced it with a 307, 60 over, with flattop 0.043, 0.043, 3 mm, 2 valve relief pistons, and his original block looks real straight, so we will keep it.So my Camaro's original 307 that I have sitting in the corner of my garage might not be completely useless after all.