Pontiac D-Port #66 Heads - Pontiac GTO Forum
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post #1 of 10 (permalink) Old 03-15-2012, 04:36 PM Thread Starter
 
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Pontiac D-Port #66 Heads

I am trying to figure out which Header gaskets I need for my #66 pontiac D port heads. The options are:

Large D-Port
1-1/8" x 1-15/16" D-Shaped Center & 1-1/2" x 1-15/16" Oval End Ports
PONTIAC Header Exhaust/Manifold Gasket

or

D-shaped center ports, 1-3/8" x 1-13/16" oval end ports
PONTIAC Header Exhaust/Manifold Gasket

Anyone know? The casting number for my heads is 481766
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post #2 of 10 (permalink) Old 03-15-2012, 06:56 PM
 
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Garage
Those heads SHOULD originally be from a '71 455....325 HP. Hope this helps.



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post #3 of 10 (permalink) Old 03-15-2012, 07:03 PM Thread Starter
 
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So which 1 of those gaskets above will fit correctly?
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post #4 of 10 (permalink) Old 03-15-2012, 08:09 PM
 
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Im confused, Is your cast number 66 or 481766? I found a part number 481760 which is for a head different from the 66 cast number head. If the heads are in your possession, just measure the D and Round port sizes to match them up with the gasket.
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post #5 of 10 (permalink) Old 03-16-2012, 10:58 AM
 
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For your info, I know on my 65 GTO and other years throughout the 60s that Pontaic did not put exhaust gaskets on. They machined everything flat and just bolted in on.
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post #6 of 10 (permalink) Old 03-17-2012, 05:07 PM
 
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all pontiac d port heads use the same header gaskets from 65-74 except ram air IV.
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post #7 of 10 (permalink) Old 03-17-2012, 07:15 PM Thread Starter
 
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Turns out this is the gasket that fits hooker header
PONTIAC Header Exhaust/Manifold Gasket
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post #8 of 10 (permalink) Old 03-18-2012, 11:51 AM
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I hope you're running those heads on a 455 or 428.....they have big chambers, really big, and will net you super low compression on a 400 engine....
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post #9 of 10 (permalink) Old 03-18-2012, 06:42 PM Thread Starter
 
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I am running them on a 472 stroker. (455 stroked)
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post #10 of 10 (permalink) Old 03-19-2012, 10:52 AM
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Great choice, then. Big valve heads that will work with today's poor fuel.
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