Quote:
Originally Posted by 67chevygary
Has anyone flow or tack tested the different powerpack heads?
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Think the 520's are the ones you want..
On the fronts of the heads they have a Rectangle with a Small tiangle on top of it.
If it is just a Rectangle they are they earlier 61 heads.
Damn this was a long time ago ..1973 ran a 64 Impala SS M/S
With a mucie m20 tranny..and pumpkin rear.
Choice of Carter WCFB or Rochester4bbl which were 450 cfm at best.
But were really responsive.
I am CarbonDating myself...
D