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View Full Version : Porting 3A heads


XCELERATIONRULES
11-08-2009, 09:06 AM
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=160374674680&ssPageName=STRK:MEWAX:IT

I just stole these heads off ebay.
I know they aren't the best flowing heads around,but the price was a steal.
Can these be ported to match the performance of earlier heads,or should I just run them stock?
I'm interested in some decent street performance,from my 1976 350.

lars
12-21-2009, 10:27 AM
leave them heads on the shop floor

1 no center exhaust devider, (doesn't matter if you run manifolds)
2 bigger bolt holes, so i'm unsure on head bolt fitment, the 76 block uses 7/16 bolts
and the 3b heads use a 1/2" bolt
not sure about cc volum either prob very big like 78cc
not a good head to put time and $$ in.

W451973
12-24-2009, 02:20 PM
Head bolt size does not matter. They are aligned with dowl pins, not bolts.

And yes, those heads are a total waste.

gibiarA09
12-30-2009, 03:46 AM
Anybody have flow numbers on Indy sr heads. Im looking for numbers on a fully ported sr head. CNC okay. NO wide porting. Possible big valves. Up to .750 lift. For use on a 4.185 or 4.195 bore drag motor. O&R

W451973
12-30-2009, 11:36 AM
Another bot ? None of his posts make any friggen sense. PLEASE DELETE this poster.