Super Stock Heads: Cast vs Aluminum Replacement

[Sean Marconette]

What are the Pro’s and Con’s for a Super Stock application for cast iron vs replacement aluminum heads?

Is a 10 HP increase, worth the penalty in a SBF application for the aluminum heads?


Thanks
Sean

[Tony Corley]

Originally Posted by Sean Marconette

What are the Pro’s and Con’s for a Super Stock application for cast iron vs replacement aluminum heads?

Is a 10 HP increase, worth the penalty in a SBF application for the aluminum heads?


Thanks
Sean

I can't speak for Super Stock per se, but I do know in the past in NMRA it was worth carrying an extra 100 lbs for UNPORTED aluminum heads in R/S over ported factory heads. Not sure that helps any.

[Rat Raceway]

You jumping ship on stock and going SS Sean?

[Sean Marconette]

Hi Ross,

Not yet, just checking on stuff. Maybe sooner after I sell my 57 Chevy! Hope all is well up north.

Sean

[Alan Roehrich]

Aluminum heads are much easier to weld, and once welded, less likely to crack. Iron heads that are welded will crack, sooner or later. Most every head run on a competitive traditional Super Stock engine gets welded.

[Kent]

I'm interested in this too.I have a 95 mustang sitting in the garage with no motor or trans. Thinking about putting something together with a 306 and the 60367 heads and bracket racing it until it gets fast enough to run well under the gt index. I would need to figure out what year between 82 and 85 had the best carb option to claim.

[Sean Marconette]

Originally Posted by Kent

I'm interested in this too.I have a 95 mustang sitting in the garage with no motor or trans. Thinking about putting something together with a 306 and the 60367 heads and bracket racing it until it gets fast enough to run well under the gt index. I would need to figure out what year between 82 and 85 had the best carb option to claim.

Kent the 82 is a 2v only. 83-85 is the same carb, a Holley 4180. The aluminum head removes the dedicated casting number for the year your claiming in SS for Fords. So it opens more possibilities on combos. The replacement heads are in no shape or form, bolt on class legal based on CC, runner volumes, and valve sizes for the year being claimed.

Sean

[richie 2]

any info avialable for a '68 327/265 hp chev GT combo? any replacement alum head for that? I must have missed the replacement news but im interested as we r looking @ the head market...good question Sean...

[Kent]

Sean the carb was my big question that is how the HP is factored and wouldn't you have to claim a year for that carb matched hp rating? I don't think every year has the same hp rating in the guide just because of the heads. What year has the best carb overall is it the 85?

[Sean Marconette]

Kent,
GT is a different animal with additional HP penalties. So add the 10 HP for replacement heads and additional HP for GT depending on the combo. And it starts to look like a bad idea on certain combos.

Look at what combo has all of the records in Stock and SS that will answer your question on the year. But that goes out the window as soon as you start going GT in my opinion.

The engine HP factor is a rating, and has nothing to do with the carb that is for that engine. Is the engine factored hard or soft is the name of the game in how far under or competitive it could be.

Dwight's website below is the quickest and easiest way to play with what works and what doesn't.

http://classracerinfo.com/