Compression

33IMP said

You zeroed in on a big part of the difference in the two combos too. Aluminum heads with a (sort-of) modern chamber, and quench.
The 440 has a 70 year old chamber, piston down the hole a bit, NO quench, and a small dome. It SHOULDNT work on pump gas. Big gear (has had 4.56, 4.11, and 3.91) and a 4500 converter helps.
A typical 225 at .050, 3800 lb 3,23 street combo, would be a disaster at 10.5.

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Thanks and yea that’s a BINGO on many fronts people miss or forget about. Sometimes the balance of the parts can be loose and sometimes there going to be tight and bad at a minor thing you would t think about. How about the things that pop surprise you?

For me, waaaay back when, I was swapping iron for aluminum heads and the thick gasket got trashed by accident and I had to use a thin gasket. I was nervous about running the slug to head at (IIRC) .028 instead of the .050 gasket on a zero deck closed chambered head. I said screw it, ran it, loved it! Later when I took the engine apart, the quenched area was whistle clean.

One member here I expressed concerns with a zero deck 360 TF headed engine and a cam I thought was going to be to smal. He shook his head and said “Sont worry about it, your good to go, all day long! No worries!”

Thanks Keith!!!! @68cuda408

Yea man! It’s a go and go it does very well.