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Re: 496 to be DYNO'D!
Yes he did use the stock valves. I believe from his post that 270cc was what he ended up with. Here are the flow numbers Mark provided.
Flow @ 28 inches, 4.310 bore. .200 171 .300 233 .400 281 .500 317 .550 323. 270 CC runner.
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82 GMC High Sierra
VortecPro 496
12 Bolt, 3.42's
AFR 265
Holley 850
Performer RPM Air Gap
Hooker 2455's
TCI Turbo 400 Super Street Fighter
TRRC 12 Bolt
Eaton Posi
Mark Williams Axles
Cal-Tracs
Hoosier 30x10.5 Radial Slick
Full weight long box pickup
Current best- 11.33@117mph
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