What are the benifits of porting the lower intake? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-09-2004, 02:01 PM   #1
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Default What are the benifits of porting the lower intake?

Just as the post ask. What are the benifits of porting the lower intake? What kind of HP benifit would it yield? Or would this be counter productive. Holla at me.
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Old 04-09-2004, 04:26 PM   #2
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Doing just the lower intake would help, but not alot. That would be kindof like putting in a 6" section of 5" diameter exhaust between the cat and muffler. Won't do you any good to have that free-flowing section alone, without the rest to back it up (dumb analogy, but it works).

Since you obviously can't do much with the upper intake, you should p&p your TB, lower intake, and heads all at once. You'll get the most for it that way.

Or go all the way with a custom upper, larger TB, p&p lower and heads, and go with larger valves (intake and exhaust). Even FURTHER would be headers after all that.

Just taking a guess, I'd say p&p on the lower intake alone would buy you 5 hp?
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Old 04-09-2004, 04:36 PM   #3
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The TB has already been done. I was trying to do the High Velocity Intake Incert, but it is proving most troublesome to get working. Keep getting a lean bank one code(P0171). I've decided to go back with the stock upper intake, but I want to get some sort of gain while I'm at it. The exhaust work is already done. Once I finnish with one car; all the lessons learned will go into the other car.
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Old 04-10-2004, 01:34 AM   #4
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Bigger valves won't get you much of anything. Any closer then the stockers, and your exhaust valve significantly heats up the intake valve, and the incoming air. The 5cfm you MAY gain with a complete valve job, will be negated by this temperature. You'll also run the risk of burning them easier.

I'll be doing a full P&P work (started getting stuff of the engine tonight) and hope to be done by the big meet (not sure about that yet).

If youre digging deep enough to get to the lower intake, you might as well do the heads too, but then you're halfway to the cam.
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