Legal Heads for SS/modified
 

So I acquired a couple new combination possibilities. One is a 315" sbc that was originally in a C/EA car in the early 90's. Has Pontiac aluminum heads and composite Intake from Brandywine. Its all fresh, just old technology and it was cheap enough to try it out. I believe Brodix cast them back in the day for NASCAR or something. Are these a legal head for say SS/BS or CS? Also, I have a top end complete SB2.2 for this shortblock after I change the necessary components. I was also wondering where that would fit in. If It would be legal in BS or would I have to go into say BM? I have sent a email to tech, but I have not received an answer. Just curious if anyone could help me out.

Thank you
Cory

Re: Legal Heads for SS/modified
 

SS/CS is cast iron in line valve heads only. Aftermarket heads need to be on the NHRA Accepted Product List. GM and Pontiac are listed separately so I don't know if you can run Pontiac heads on a Chevy. The national record holder in CS is a 302 Ford running NASCAR iron short track heads. They aren't listed but have a factory part number.


Aftermarket aluminum heads, inline or canted, are allowed in SS/BS. Watch out for the Hancock and Lane car from D6 if you build this.


EDIT: I had difficulty getting responses from tech out here on the West coast for Super Stock Modified classes too. I didn't go ahead with my build until I found the Canadian car I referenced above on Facebook, CR and in the NHRA record book. It's a weight to HP group with few engine and valve restrictions.

Re: Legal Heads for SS/modified
 

The Pontiac heads were made for the small block Chevy and are legal in Modified. I use the Buick head on a small block Chevy which is legal in SS Modified

Re: Legal Heads for SS/modified
 

The Aluminum heads would be legal in SS/BS.

Re: Legal Heads for SS/modified
 

Can run SS/BS with either cylinder head, or run SS/AS with the SB2.2.
Can also run SS/AM thru SS/FM with both heads.
Canted valve allowed also in SS/AM and SS/BM.
SB2.2 is a splayed valved head, not canted.

Re: Legal Heads for SS/modified
 

I think the 2016 Div 4 SS champ ran a small cu in SB.2 engine in SS/BS.
Two sets of headers came with the car. Looks like a 15-18 deg set and an SB.2 set.

Re: Legal Heads for SS/modified
 

SB2 is a canted, not splayed.

Re: Legal Heads for SS/modified
 

Thank you for all your replies. I really appreciate the info. Now to get it together and make some noise

Re: Legal Heads for SS/modified
 

He is asking about the SB2.2, not the SB2.

SB2 valve angles are 12° x 4° Intake and 8° x 0° Exhaust and considered Canted.

The SB2.2 valve angles are 11° x 4° Intake and 8° x 0° Exhaust and considered Splayed with all the intake ports pointing towards the center of the cylinder head.

The 8° Exhaust valve angles towards the intake manifold just like a normal wedge cylinder head.

Re: Legal Heads for SS/modified
 

Thanks, did not know that!

Re: Legal Heads for SS/modified
 

The way I read the new Head rules is that any aftermarket head is legal in SS Modified. Doesn't need to be factory part number any more.
some CFE splayed valve in SS/AS or AJ 18 degree in SS/BS??

Re: Legal Heads for SS/modified
 

Could you forward where you read this? Interested, Thanks.

Re: Legal Heads for SS/modified
 

Nope.

The aftermarket cylinder head needs to be approved by NHRA and added to the list of NHRA accepted products. No billet heads allowed although there are rumors of some billet heads in use that have been made to look like a casting.

It took me close to a year to get an Edelbrock cylinder head approved.

Re: Legal Heads for SS/modified
 

Be careful down there in the Modified and Modified Stock classes of SS. Read and stick to current rules.

SuperStock Modified
"V-8 splayed valve permitted in AM and BM, canted or inline in
CM through FM, and any valve configuration in GM with V-6
engine. All heads must be NHRA-accepted, two valves per
cylinder. Aftermarket aluminum cylinder heads permitted (no
billet)."
Where it matters: SS/CM Aluminum canted heads allowed with NHRA stamp.

SuperStock Modified Stock
"V-8 splayed valve permitted in AS, canted or inline in BS, inline
only in CS, and any valve configuration in DS. All heads must be
NHRA-accepted, two valves per cylinder, except in classes DS,
ES, FS, and GS, four valves per cylinder permitted. Aftermarket
aluminum cylinder heads permitted (no billet) except in CS."
Where it matters: SS/CS Inline iron heads only.

Watch your Modifieds.....

Re: Legal Heads for SS/modified
 

In the recent past, cylinder heads used in NHRA Super Stock Modified class had to have an OE casting number. However current rules state that aftermarket aluminum heads may be used in this class. But it also states that the heads must be on the "NHRA approved head" list. Make sure that the heads you chose to use are in this NHRA "list" and keep a hard copy of this list in your files. Yes, it is true, NHRA has been known to change their minds on this sort of things in the past. If your heads happen to get dropped from the list in the future, you should be "grandfathered in" with the list of the approved heads in your possession.

Re: Legal Heads for SS/modified
 

Here is current list of the legal aftermarket heads allowed in the SS/Mod classes.

So whats on here or having a genuine factory part number is whats legal.

Good luck, have fun!

Re: Legal Heads for SS/modified
 

Sorry for any confusion, I missed the Approved, lingo!!
WoW, that 14500000C Dart head is a 9 deg head..
AJ 18 head won't hang with that

Re: Legal Heads for SS/modified
 

Ford boys use the N351 Sportsman head with a 10 degree valve angle. It's not on the list because it's a Ford part number M-6049. n351. It's on the SS/CS record holder.

Re: Legal Heads for SS/modified
 

That Ford head is iron and nobody would use that in any other class than SS/CS.

Re: Legal Heads for SS/modified
 

iron and heavy as hell

Re: Legal Heads for SS/modified
 

Racing Head Service (RHS), used to offer a large port SBF, 20 degree cylinder head under their ProAction line. These were based on an Australian made cylinder head.

They were available with 185cc, 200cc, 215cc, 221cc and 235cc intake ports with chambers in different sizes, as low as 58cc. There still some out there for sale and they pop up in Ebay all the time. I have a new set of of the 235cc bare castings and would be a head to get approved as an alternate to the N351 head.

https://www.speedwaymotors.com/RHS-3...cc,225808.html

Re: Legal Heads for SS/modified
 

Had to change my head gaskets today. Wrapped a chain around my waist and bolted the ends to the shop floor to keep from ending up face down in the engine bay. I'd use my crane but it's out of reach right now.

Re: Legal Heads for SS/modified
 

And since the Ford's are allowed a 10deg head. Why not allow the chevy's a 14 deg pro action head?

Re: Legal Heads for SS/modified
 

For SS/CS?
The iron Pro-Action 14 degree head would be great.....if they hadn't been discontinued almost a decade ago.
Hasn't Ford stopped producing N351/352 also?

Re: Legal Heads for SS/modified
 

I think so. The article I have on the update and "new" casting run is dated 2002. I don't know how many heads they did in that run, but they are still available from Speedway and (I think) PitStopUSA. Jesel had a rail rocker kit for the N head in stock. It's the approved head for grass roots circle track racing so as long as Fords are on dirt tracks, N heads will be on the shelf somewhere.

Re: Legal Heads for SS/modified
 

Yes for SS/CS. You can still find em

Re: Legal Heads for SS/modified
 

NHRA will only approve cylinder heads available to the public.
The RHS/ProAction cast iron cylinder heads were discountinued many years ago.

How I know? I tried to get the RHS Ford cast iron head in the approved list and was rejected twice because they are were discontinued.

There are still some virgin SBC 14 degree heads out there, however, due to their demand in the Comp Eliminator Jr. Fuel classes, they are a big commodity.

There are still a large number of Ford N351 castings available because they have been banned from many circle track classes. As a matter of fact, I have two pairs of new N351 heads on the shelf and one set of fully ported bare heads also.

Re: Legal Heads for SS/modified
 

On the ported set are the intake ports raised and the floor raised from the short turn raised the same amount?

Re: Legal Heads for SS/modified
 

Hey Dale, it might not have been announced very well but the new record holder in SS/CS is Tim Sloan in a grand am with a 305. I dont know the specific heads he runs. He set the record late last year.

Re: Legal Heads for SS/modified
 

That was my observation also. Although I feel that NHRA makes exceptions on the "available to the public" premise. Some of the "accepted" aftermarket heads on the list are only available if you know somebody.

Re: Legal Heads for SS/modified
 

Congratulations to the new record holder. Competition only makes a class stronger. CS has a lot going for it and should attract more racers than it does. It amazes me what racers can do with these small displacement engines.

Re: Legal Heads for SS/modified
 

If it has a GM casting number is it legal, Not talking about the SS/CS class.. the rest of the modified classes.
But would it have to be approved for SS/CS?

Re: Legal Heads for SS/modified
 

It's aluminum, so no for SS/CS. Inline iron heads only.
Handy link:http://www.castingnumbers.info/site/main

Re: Legal Heads for SS/modified
 

Adger,
The cylinder heads were casted by Dart for GM.
They would be legal in SS/AS and SS/BS, SS/TA, SS/TB, SS/TC and SS/CM thru SS/FM