Re: Thoughts on accepted aftermarket heads for 350?
 

Can't answer that. The AFR 1399 aluminum head is NHRA approved for SS, but it ships with 1.9 and 1.6 valves installed. Larger than the Ford heads it's approved to replace. You would have to knock the valve size down to pass a SS tear down. I wasted a couple of grand on believing the Approved list, so be careful.

AFR `1399
58cc
valves 1.9/1.6
I runner 165cc
E runner 68cc

c8oe f J code 302/230
49.5cc
valves 1.783/1.457
I runner 130cc
E runner 49cc

Got iron heads now.

Re: Thoughts on accepted aftermarket heads for 350?
 

Any modifications to the runners are illegal, so if they match up to the stock numbers NHRA will know they are modified.

Re: Thoughts on accepted aftermarket heads for 350?
 

So if I’m understanding this correctly , you must run the aluminum/ replacement heads in either stock or super stock using the runners as they come from the manufacturer. The exception being replacing the valves and seats with the correct OEM sizes?

Re: Thoughts on accepted aftermarket heads for 350?
 

That's what I'm understanding. The air flow is going to be restricted by the intake regardless, so with the larger head runners i don't think it'll help that much.

Re: Thoughts on accepted aftermarket heads for 350?
 

That's what I was told regarding my AFRs. Smaller valves would degrade the heads performance. The shop that does work for Hancock and Lane advised against that route.

Re: Thoughts on accepted aftermarket heads for 350?
 

I know of at least one stocker 428 CJ intake manifold that is 10 lbs lighter in wt. than any others. No grinding on the outside either !

Re: Thoughts on accepted aftermarket heads for 350?
 

Anyone notice that the approved Dart head is iron?

Dart catalogue

Re: Thoughts on accepted aftermarket heads for 350?
 

Yes that one is on the top of our list to work with.

Re: Thoughts on accepted aftermarket heads for 350?
 

I still don't think you make the intakes big enough to really let the heads breathe. What's the standard CC of the stock Chevy intakes compared to a 185 cc head runner?

Re: Thoughts on accepted aftermarket heads for 350?
 

#1 Greg Hill; The Edlebrock heads are 185 cc’s on the intake runner. Who approves this stuff?
Follow the money............

# 2 Todd Hoven "Great thing about aluminum. You can weld it up, reprofile it, and cover it up. It will look like new and you probably pick up 30 hp at least. "
Think about it, Read between the lines.. this also applies to Aluminum Intakes...

# 3 "I was looking at them and the Dart look to be the best without going to the aluminum heads"
Don't count on it , if this deal stays at +5hp for replacement heads, the Iron will be way disadvantaged, esp if the combo has an Alum Intake. refer to comment #2

Obviously, no one who has a clue of stock eliminator made the decision to include these alum heads replacing factory cast iron. I'm not a chevy guy but now as I see it in the guide the 350 has choices of 4 replacement heads plus the original. As mentioned in another thread here on CR that potentially creates 5 sub combos of the same engine. In the future will we need 5 hp factors for the same engine? Yea, and this goes for all the Makes also, whether it's a Mopar Ford or GM.