Ported LT1 intake ?????'s
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Ported LT1 intake ?????'s Ok so I have an LT1 intake that has had the runners ported and is ready for a 58mm TB and I'm pretty much ready to slap it on the car but I was wondering if there was going to be an issure with not actually having the heads side done??? I assume that it shouldn't make that big of a deal as far as hurting it but I realize that I would get the peak performance out of it as I would if the intake side of my heads was done. If some one could give me and inputs on this matter I would appreciate it... Thanks
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Is it a significant gain to do this port job? I mean I would hate to mess up the heads beyond use!!! I've never done it before. I mean it seems like it would be kind of easy considering your just matching it to the gasket but there's always that chance of not having a perfect flow... Who else recommends doing this jod for the first time????
IMO its not worth the gain. If you have never done it before. IF you mess up the heads you mess up the heads. A ported intake atop a set of stock heads might gain about 3-5hp.
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So as long as I gasket match and take off just the amount from the marking I should be good YES???? How far do I port the work down into the runner??? I mean clearly I would do the lip but what is until desired or what?
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I have seen Lloyd explain this before. You do not want to "gasket match" the ports. Also, the guy that did my 383" LT4 heads tells me the roof around the injector is criticle. As I have seen Lloyd mention, the floor in the intake is lower than the heads. The angle where they intersect is a tad severe, lowering the floor of the intake ports just agravates this. One of my super Stock engines has a stock intake, straight out of a salvage. I filled the floor to match the floor in the heads, and that helped the angle issue. The port entries could use some help with the radius, but you need to cut the top off the manifold to get to that area easily. Lloyd posted a good description of the work the manifold runners need. Do a search and follow his instructions if you insist on doing it yourself. Don't gasket match everything, that is just wrong. Unless, of course, your looking to be slow.
Good luck, Ed
Good luck, Ed
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Bingo. Gasket matching is nonsense. This area is the least restrictive part of the entire port. On top of that, if the cross sectional area of your heads is now smaller than your intake runner you've possibly created MORE problems. If the head is jutting out into the flow path, it will significantly impede flow. Bigger is not better, and just because everyone else does it doesn't make it correct.
Did a search, I believe EdWright was talking about this thread. look toward the bottom on the first page for a post from NightTrain66 (Lloyd Elliott)
Any Good Guides for Porting Intakes?
Any Good Guides for Porting Intakes?
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From: ohio
I have seen Lloyd explain this before. You do not want to "gasket match" the ports. Also, the guy that did my 383" LT4 heads tells me the roof around the injector is criticle. As I have seen Lloyd mention, the floor in the intake is lower than the heads. The angle where they intersect is a tad severe, lowering the floor of the intake ports just agravates this. One of my super Stock engines has a stock intake, straight out of a salvage. I filled the floor to match the floor in the heads, and that helped the angle issue. The port entries could use some help with the radius, but you need to cut the top off the manifold to get to that area easily. Lloyd posted a good description of the work the manifold runners need. Do a search and follow his instructions if you insist on doing it yourself. Don't gasket match everything, that is just wrong. Unless, of course, your looking to be slow.
Good luck, Ed
Good luck, Ed
