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Old Yesterday, 08:40PM   #61
Steve C
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I offered that because I don't think he will find a 236-238 degree hyd flat tappet cam is going make peak power at 6200 rpm. Just my .02


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Old Yesterday, 11:48PM   #62
KrisR
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Quote:
Originally Posted by Steve C View Post
Not apples-to-apples but many years ago I did a .060-over 400 with raced ported d-port heads (about 280+ cfm ) with a Performer RPM intake & Brad Urban Holley rated at 926cfm, 1-7/8" headers and a 251 degree UltraDyne solid roller cam ground with a 108 lobe separation. On the dyno it made peak power at 6400 rpm and peak torque at 4800 rpm. The use of a single-plane intake would of pushed the peak power up 200-300 rpm.
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This is similar to what i'm expecting with my new camshaft in my 400, glad to hear that my thoughts aren't complete BS if someone has done something similar before

255/262 @ 0.050 on 108 with 0.625 lift after lash, 400, e-heads, single plane EFI intake, 5000 converter but 3.89 gears for now. Just getting the heads milled for 11.5 CR and setting up for new springs. Should be a healthy street car but at 3800lbs, it won't be turning the earth off its axis. Previous 242/248 hyd roller and 10.2 CR ran 11.7 @ 115 at that weight with a pretty horrid 60', so hopefully i'll get it back together and tested before we have some cool weather, it's averaging between 30-40degC lately (86-104degF).
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Old Today, 12:07AM   #63
Steve C
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The cam was a UltraDyne 284/295 R8
251/262 at .050"
.3883" lobe lift on both intake & exhaust with 1.65 rockers / .026" lash

This was over 20 years, looking at a dyno sheet it suggests it may have been peak power at 6200 rpm. So I'm not sure.

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Old Today, 01:54AM   #64
Gach
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Steve, what did it make for hp
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Old Today, 01:57AM   #65
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Quote:
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I offered that because I don't think he will find a 236-238 degree hyd flat tappet cam is going make peak power at 6200 rpm. Just my .02


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I agree
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