Square Round Oval port heads - The 1947 - Present Chevrolet & GMC Truck Message Board Network

summitflier · 07-08-2015, 04:20 PM

The heads on my small block have a decidedly square looking exhaust port to me. But then it seems most (after market at least) heads are this way.

So do we use oval shaped headers? D port headers? Round port headers?
A special flange gasket?

Redline novdog · 07-08-2015, 05:59 PM

My $.02 get the hedders of choice,gasket to match. place gasket scribe visible metal on cyl. head. proceed to grind w/die grinder( while you're there clean up an inch back towards the valve make sure to keep metal away from valve seats). Small parts on cyl.head smaller than the bore on the hedder will just be anti reversion. When gasket matching you should be able to determine if there is not enough gasket sealing surface. I have never encountered such, but never say never.

Redline novdog · 07-08-2015, 06:01 PM

O bye the way good lookin' motor! sweet!

summitflier · 07-08-2015, 06:19 PM

Thanks. I'll give that a shot.

07-08-2015, 04:20 PM	#1
summitflier Registered User Join Date: Jun 2015 Location: Ephrata, WA Posts: 308	Square Round Oval port heads The heads on my small block have a decidedly square looking exhaust port to me. But then it seems most (after market at least) heads are this way. So do we use oval shaped headers? D port headers? Round port headers? A special flange gasket? Attached Images __________________ 68 C10 SSB 383 12 Charger 6.4L 12 Accord 3.5L (Wife's ride) 05 Ram 1500 5.7L My build thread - http://67-72chevytrucks.com/vboard/s...d.php?t=676545

07-08-2015, 05:59 PM	#2
Redline novdog Registered User Join Date: Jan 2012 Location: Washington,Il Posts: 632	Re: Square Round Oval port heads My $.02 get the hedders of choice,gasket to match. place gasket scribe visible metal on cyl. head. proceed to grind w/die grinder( while you're there clean up an inch back towards the valve make sure to keep metal away from valve seats). Small parts on cyl.head smaller than the bore on the hedder will just be anti reversion. When gasket matching you should be able to determine if there is not enough gasket sealing surface. I have never encountered such, but never say never. __________________ It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS

07-08-2015, 06:01 PM	#3
Redline novdog Registered User Join Date: Jan 2012 Location: Washington,Il Posts: 632	Re: Square Round Oval port heads O bye the way good lookin' motor! sweet! __________________ It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS

07-08-2015, 06:19 PM	#4
summitflier Registered User Join Date: Jun 2015 Location: Ephrata, WA Posts: 308	Re: Square Round Oval port heads Thanks. I'll give that a shot. Attached Images __________________ 68 C10 SSB 383 12 Charger 6.4L 12 Accord 3.5L (Wife's ride) 05 Ram 1500 5.7L My build thread - http://67-72chevytrucks.com/vboard/s...d.php?t=676545



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