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Old 06-29-2003, 11:45 AM
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Flow Numbers Question

I have a set of 492 SBC heads that flow 249 @ .500 @ 28". Can you estimate potential HP by flow? How do this number sound for home-ported heads? Also, how high can you stack spring shims? My springs call for 1.750 installed hieght but most of my pockets measure 1.850 to 1.900. Thanks,

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Old 06-29-2003, 12:32 PM
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If you were to have everything at the optimum, cam, compression, timing, intake, exhaust, carb, etc etc....
They should be capable of slightly over 500hp.

All this is based off Superflows hp calculation for air flow, theres so many variables you cant just look at air flow alone. So start subtracting from that.

Compare your heads to these. I think you did pretty good for a home port job.

http://www.airflowresearch.com/pages/190sbc_sh.htm

http://www.airflowresearch.com/

You could get a set of -.050 installed height keepers and use shims.

Last edited by Greg Latvala; 06-29-2003 at 12:54 PM.
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Old 06-29-2003, 02:40 PM
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That's a really great port job on a set of stock 157 runner length head's. What type on flow tester did you use?
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Old 06-29-2003, 02:48 PM
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I believe it's a SuperFlow bench. It was flowed by Wynne's Speed in Richland, MS. They're a good-sized, well-organized shop so I trust the numbers. I hope they work well - as much time and money I have in them!

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Old 06-29-2003, 06:31 PM
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You will like the heads, I have a set also thats why I asked.
I had a shop check the flow on mine and the equipment wasn't the greatest, I had a little higher #s on flow, guess they were correct. They were 264 on their stand. I pocket ported them, dimpled on the slow side and put a "D" shape roof on the ehxaust port.
I had them on a 406 with a CompCam 292H with 10.5:1 compression with dished pistons.
Use the Fel-pro 1014 marine head gaskets.
They have the steam holes in them.
You will be happy with them.
Good Luck,
George
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