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GAINS FROM RAISED PORTING INTAKE AND ALUMINUM HEADS

TIMINATOR

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Joined
Dec 20, 2023
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Location
Avondale,AZ.
I have a set of aluminum heads that I will port and wondering if raising the top and widening the port to the big gasket size will gain much.
Heads now only flow around 280 and I own two sets, a Chinese set and performer RPMs too. There is enough meat in two of the intakes I have to do this. Just wonder if anyone has done this.
TIMINATOR
 
I pay close attention to what you say. I think you are one of the few here in a class of you own. Very knowledgeable. You know what you are doing. Now I wonder if this is a test? Maybe your just seeking a first hand experience. No offence meant here.

This is why our mopars where built.
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Not a test.
Ported stock 440 heads gain about 28-34 cfm with this max wedge porting. You don't even need to widen them to get some gain.
But stock heads have a big hook in them that aftermarket heads dont. But since I have performer rpm and raised runner speedmaster heads I was wondering if anyone has flow tested with raising the inlets. If no one has got this info I guess it's back on my flowbench and map the port before doing any work.
If no definitive answers I guess I will get on it in my spare time. Which I don't have much....
TIMINATOR
P.S. ya gotta raise the intake manifold too. Some can be raised more than others. "In the day" I raised the intake first a safe amount, then raised the heads the same amount.
 
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