GAINS FROM RAISED PORTING INTAKE AND ALUMINUM HEADS

[TIMINATOR]

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

 

[Challenger RTA]

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.

 

[TIMINATOR]

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.

 

[Challenger RTA]

Knowing enough to be stupid. I was thinking the maybe the intake could be machined to lower it to match the heads. Same as when the block is decked the intake side needs to be machined to some extent. Just wasn't sure how they were matching up originally. It's all the opposite of what I was thinking. Thanks

 

[Xcudame]

Maybe I'm lazy, but if I wanted Max Wedge flow, I'd just buy a pair of Indy or 270 TrickFlow heads and their intake and call it a day. Seems like a lot of work for something that will probably flow more than the "stock" head, but less than a "max wedge" type head. You could sale the two sets you have to help offset the cost of Indy or 270 Trick flow Heads.

 

[TIMINATOR]

I have 3 motors and 3 sets of heads. And a flow bench. And a dedicated porting room.
Factory iron heads have a big hump in the floor and raising the top of the port gives a straighter shot to the bowl with a good flow gain
Edelbock and 440 source (I have a pair of each) minimize the hump and the speedmaster (other set) raises the floor around 5/8" and extends the port higher so to minimize the hump completely.
Time to see what they all flow.
I will apparently use the lesser heads on the 2 498s and speedmaster raised ones on the 512.
I need to either get 2 A bodies or a shortbed truck. The 72 Challenger gets the 512.
All of the heads are stock as of now. I will post some stock numbers. 440 source, e brock and speedmaster advertise almost identical numbers. I can't see that the raised ports only flow the same as stock location ports. The bench dont lie. We will see and I will post.
TIMINATOR

 

[Xcudame]

Oh, this should be interesting! My understanding of the 440 Stealth head is they were just trying to recreate the stock "906"/"915" head in aluminum. If I had to guess, I'd say raising the top of the port would be good for 15-20% flow gain at the higher lifts. Will be interesting to see your results!

Which Edelbrock heads? E-Street?