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Robin

Member
Hi, I'm trying to find the flow chart for a 427 C3 Corvette 1970. the head casting N°3964291 HI PERF rectangle intake.
This is a matching N° car all that's missing is the Tri pack and manifold, Trying to find the flow N°s to sort a cam (no flow bench).
 

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member

Robin

Member
Hi Thanks!
The list shows BBC Chevy Rec port but the only flow listed is @ .600" lift, 331/201 no other readings.
 

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
you may have missed this

.100.200.300.400.500.600.700
Chevy 291 Rect. 3-angle VJ Meaux Racing SF600 Iron​
N/A2.19/1.88N/A-136-134/114200/153248-239/171281-261/184302-278/192316-287/196-------
Chevy 291 Rect. M Chips Iron​
N/A2.19/1.88N/A65/55147/110211/143245/172266/195284/209299/220-------
Chevy 291 Rect. Weingartner Racing Brez Iron​
N/A2.19/1.88
4.31
No Pipe
N/A-141/112207/139251/163288/180289/194291/197-------
Chevy 291 Rect. Weingartner Racing Iron​
N/A2.19/1.72
4.50
No Pipe
N/A67/54137/104205/132248/156287/174319/182323/187
 

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
this might be a good place to point out the noticeable increase in potential flow rates a decent aftermarket aluminum cylinder head potentially could provide, now obviously they cost significantly more and reduce the engine weight by at least 45-50 lbs, but most decent 315cc-345cc aluminum heads do cost well over $2600 --$4200 for a matched pair





 
Last edited:

Robin

Member
this might be a good place to point out the noticeable increase in potential flow rates a decent aftermarket aluminum cylinder head potentially could provide, now obviously they cost significantly more and reduce the engine weight by at least 45-50 lbs, but most decent 315cc-345cc aluminum heads do cost well over $2600 --$4200 for a matched pair





Hi,
Thanks again for the info! these heads l have are stock and the motor has a Comp cam Magnum Grind N° 292H that someone fitted some years ago with a 850cfm Holley. Do have any stock flow N°s for this heads. I've searched but have not found any.
 

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
sorry I looked, and have yet to find any reliable posted info
but the info on the mildly ported casting I posted would be fairly close ,
the heads already in stock form flow rather well.,
I doubt they go more than a 15-20 cfm boost in flow at most lifts
 
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