440-1 flow numbers

Jeremiah (jd) said

I have looked at quite a few of -1, -13 and Victor MW flow sheets. They all seem to go 370-390 CFM on the intake @.700-.800 and the exhaust goes 265-285 CFM. Depending on the setup they are good for 750-900hp. The higher RPM (8000+) 500-540" engines seem to make the most HP.

Thank you for sharing data!

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Bobzilla said

Does he have any comparison numbers on the same bench from a non-ported 440-1 head?

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When I was there today, he said he won't even waste the electricity to flow a set of unported 440-1 heads because they are so bad out of the box. He dug through old files today clear back to the 90s. I can't remember the exact numbers from the one set of unported 440-1 heads he found flow numbers on (using the same bench), but they were very low. So low that I can't even remember the numbers lol. Tim has many years experience with flow benches and engine dynos. The flow bench he bought he used for many years at our machinist's shop.

We also looked at 572-13 heads that were CNC and he finish ported, wow those things are BAD A$$. I don't want to misspeak about the flow numbers he got from a 572-13 head, but it was substantially better (obviously) than my -1 heads. I want to say peak was around 420 cfm at .800 lift. No wonder they make such good power. He said they needed a good bit of work to get there. Every set of heads out of the box that enters his shop needs a good bit of work to make good power, even when they are CNC. He said that includes B1 heads, they are no better out of the box.