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Re: A Little Disappointed--Victor Heads
[Re: reknapp52]
#1275283
07/28/12 02:09 PM
07/28/12 02:09 PM
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Joined: Jan 2003
Posts: 16,930
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,930
NC
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Quote:
The intent was to gain a few MPH from my 447 low-deck in Super Gas (throttle-stop) racing...
I swapped out my 4:30 gears for a set of 4:56s, which netted 100-200 more RPM in the lights, and no difference in MPH.
What compression ratio are you running? What is the shift point and finish line rpm you are seeing?
In a "small" 447 CID and that much duration (280 at 0.050"), it should like 7500+ rpm. But the tight LSA (106) will favor mid range rather than peak hp (hp corresponds to mph). You added almost 10 deg at 0.050"
MP590: 303/303 at 0.020", 271/271 at 0.050", 106 LSA, 1.5 rockers
Roller: 308/308 at 0.020", 280/280 at 0.050", 106 LSA, 1.6 rockers
The unported Victor heads should flow better than your ported 915's (310 cfm vs 290 cfm?). But it is a shame to have heads with potential that is not used since the porting was not done. I assume these are the standard port (not max wedge) heads.
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