[QUOTE]Originally posted by firebird45331
[B]That intrigues me that all things being the same the 383 only produced 20 more hp.

Firebird, Isn't it amazing that these guys working out of their own garage or backyard can come up with all this horsepower on the street,while the professionals with all the resorces they have at theit disposal,the finest at their fingertips, including test facilities and dynos, building a good street engine to run on pump gas, never come up with all this super horsepower.I would suggest to you that 95% of the time that H.P. is only in their imagination.

This is the comparision I was talking about.
1--350 C.I. ( stock bore) --600cfm Holley --Air Flow Research 195cc street heads--AFR Flopower rpm intake--AFR hydraulic
218/223dur-460/470lift cam--1 5/8 headers--9.0 compression Max HP. 420@5000-------Max Torque 435@ 3800

2--383 used the exact same setup
Max HP. 440@5000------Max Torque 470@3500

If You look at the last couple issues of Super Chevy, the articles on Major Mouse a 427 small block--Roller cam--Speed Demon 750 carb--Per.RPM AirGap intake---Comp pro magnum 1.6 roller rockers
Notice the only difference is the 2 sets of heads

Last month--- Edelbrock E-tec 170 aluminium heads -194/155 valves --Max HP 512 @ 5400-----Max Torque 570 @ 4000
This month---Brodix Race Rite 180 aluminium heads-202/160 valves--Max HP 515 @ 5400-----Max Torque 572 @ 4200
If You read the articles and study the charts you would see that even with the 427 small block, the smaller heads with the smaller valves were better for the street.