335 HP 396 290 Head Casting Build & Dyno Test

[Tim H]

Chev V8 Big Block Cylnder Head 3964290 Small plug Flow Data - unported
Data Source Int/Ex Valve .100 .200 .300 .400 .500 .600
Chevy 290 Oval Port Iron CHP 01
253.0 / 112.0 cc's, Exhaust = No Pipe 2.065"/1.725" 60/47 122/88 172/113 214/133 244/152 256/161
Chevy 290 Oval Port Iron CHP 02
253.0 / 112.0 cc's, Exhaust = Pipe 2.065"/1.725" 60/47 122/90 172/118 214/138 244/160 256/174
Special thanks to Stan Weiss for supplying data. This is only a small detail of information available on his website. It is worth the time to dig into his stuff at

[Glenn Briglio]

Flow test should be done with correct bore size or you could be getting incorrect data.

[HP HUNTER]

Originally Posted by Glenn Briglio

Flow test should be done with correct bore size or you could be getting incorrect data.

I will agree, but I'm just looking to see the gain, I will not buy a bore sleeve and top plate for this small bore project. I've been very impressed with your qualifying, great work!

[Dwight Southerland]

Did you pour the intake and exhaust ports for volume?

[HP HUNTER]

Originally Posted by Dwight Southerland

Did you pour the intake and exhaust ports for volume?

Not yet, but I certainly will pour them, when I'am done the intakes will pour less than they do now. I will not be doing any porting, and they were not ported previously.

[Adger Smith]

Mark,
since I'm not well informed about the stocker combinatons...
What year and body does the 335 HP 396 fit?
I found the small cam 1969 335 HP 427 in Dwights class tool section

[HP HUNTER]

Originally Posted by Adger Smith

Mark,
since I'm not well informed about the stocker combinatons...
What year and body does the 335 HP 396 fit?
I found the small cam 1969 335 HP 427 in Dwights class tool section

I believe its been factored down to 330 HP with an automatic, 1968 Nova, Camaro, Chevelle SS From GM 350 HP 396 .460/.480 lift. 335 HP 427 is .398 lift I believe.