Re: 305 HO heads # 14102187
I dont know if the original poster has made a decision on which heads he is going with... but for the sake of future searches done by interested parties therein, the 305 "HO" 416/081 and 601 heads flow less than the Vortec 305 059's. This is proven fact information over at thirdgen.org which is very big into 305 performance for obvious reasons. There you will find numerous 416/081 & 601 head flow tests, stock and ported and for what its worth..... the 305 059 vortec heads flow similar numbers to the 062 counterparts. Even with a smaller valve and slightly smaller runners, they are only marginally down (225 vs 215 cfm) @ .500" lift intake. The 305 HO heads from the eighties flow 170-199cfm intake. Exhaust is poor on all of them and should be ported, no matter what for an easy gain.
Sorry for bringing back an old thread.
EDIT ... PS... Unless your getting a deal, Vortecs NEW with matching intake are not that much more cost effective than a set of aftermarket aluminum sbc heads. Especially anything thats got TPI or most any other EFI intake.