Thoughts on accepted aftermarket heads for 350?

[FireSale]

Originally Posted by 5389stk

Question who actually submitted all these heads to NHRA or did NHRA pick them out. All these heads cc way to big to be used in stock.

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.

[Bobby Lundholm]

Originally Posted by 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. You have to do
something to keep up with the Mopars.

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

[Mark Ugrich]

Originally Posted by Bobby Lundholm

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

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?

[Bobby Lundholm]

Originally Posted by Mark Ugrich

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?

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.

[FireSale]

Originally Posted by Bobby Lundholm

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.

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.

[X-TECH MAN]

Originally Posted by Bobby Lundholm

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.

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 !

[FireSale]

Anyone notice that the approved Dart head is iron?

Dart catalogue

Iron EAGLE s/s 23° 165cc (55-86 Std. Intake Face)
72cc Chambers – 1.940”/1.500” Valves
10021070 Bare Head

NHRA Accepted Stock/Super Stock Cylinder Head Volumes Updated June 14, 2017 Highlighted items designate recently added since last revision
Head # 10021070 Dart
Intake CC's Max 172
Exhaust CC's Max 65
Same As Stock 80-92 305; Same chamber CC's, valve sizes as head replacing intake and exhaust

[Bobby Lundholm]

Originally Posted by FireSale

Anyone notice that the approved Dart head is iron?

Dart catalogue

Iron EAGLE s/s 23° 165cc (55-86 Std. Intake Face)
72cc Chambers – 1.940”/1.500” Valves
10021070 Bare Head
It's listed in the Accepted Products release pg 42 (2017) under that part number.

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

[Bobby Lundholm]

Originally Posted by X-TECH MAN

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 !

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?

[Steve Stickel]

#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.