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Porting cast iron manifolds

Old 02-26-2004, 07:52 AM
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BBB
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Porting cast iron manifolds

I am porting on my stock manifolds (LT1). They are going to get ceramic coated (HPC) when finished. I have one concern. Does porting manifolds leave them prone to cracking? I believe the ceramic coating would help to even out heat distribution so I don't have hot spots.

Thoughts? Experience?

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Old 02-26-2004, 06:24 PM
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depends on who and how the ceramic coating is applied

but a couple of times you have to go back and Re-Mill intake sides

because intake was warped from Ceramic Coating Process heat
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Old 02-28-2004, 06:20 AM
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Ive run [email protected] on 97 manifolds.That was a stock shortblock with a stock LT1 cam and 3700lbs..I lightly ported them..Mainly the drivers side was opened up where it enters the cat with a real piece of exhaust tubing..Opened up the ports as much as i could at the engine as well..Lt1 manifold flow pretty well but there isnt much room to open them up safely..
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Old 02-28-2004, 05:12 PM
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I have not really "ported" stock manfiolds per se, but I have gotten them extrude honed on a couple of "stealth" engines. That process clears out all the crap and sharp edges from the places you can't get a grinder into. Maybe get them lightly extrude honed and then work on them with a grinder in places you think you can open them up and/or imporve flow by hand.
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