NHRA Stock/Super Stock Classification
 

Can someone help me to understand how to read the classification guide? To determine the weight break, do I look at the year of the car with the size of the intended engine in the same year?

My intended combo is for Super Stock.

• 1982 Mustang hatchback
• 1968 302, 4 barrel engine
• Automatic engine

Thanks for the info.

Re: NHRA Stock/Super Stock Classification
 

Based on the Classification, a 3 door `982 Mustang has a shipping weight of anywhere from 2,555 to 2,582 (depending on base model, GT, GLX or GL body). There are two, 1968 Ford 302's listed. One is a 210 HP NHRA rated, one is a 230 HP NHRA (de-rated to 200 with OEM heads or 230 with Replacement Heads). Using the 210 version, in the GLX body, the weight break is 12.29, making it a natural GT/I or GT/IA, and is permitted to also run GT/H(A) and GT/J(A).

http://www.nhra.net/tech_specs/class...s/1968FORD.xls
http://www.nhra.net/tech_specs/class...s/1982FORD.xls

Re: NHRA Stock/Super Stock Classification
 

Mike: thanks for the explanation.

One other question, how do I determine which HP rated 302 I would be using?

Re: NHRA Stock/Super Stock Classification
 

210 hp is a 2 bbl. combination
230 hp is the 4 bbl.

Re: NHRA Stock/Super Stock Classification
 

So if my heads show the casting of 2V - C8OE-J and based off of the NHRA blueprint guide, these are for the 210 HP combination. I'm assuming that means I couldn't use them on a 4 bbl 230 HP combination, correct?

Mike also pointed out that the 230 HP combination is with "replacement heads" and defactored with a OEM heads. I don't see a specific replacement head listed for the 1968 302. Any ideas about how to find out what that replacement head is?

Re: NHRA Stock/Super Stock Classification
 

All the information you need is in the Classification Guide and the Engine Blueprint lists. If you look at the top of the 68 Ford Class Guide ( GT Specs) it shows the different HP ratings for the different heads. When you go to the specific car in the Class Guide ( 68Mustang ) it shows the replacement heads. In your case Canfield or AFR. Now if you are really serious about this combo you can claim it as a 68 Mercury 302 and you get to use a Holley carb.

Re: NHRA Stock/Super Stock Classification
 

I typed the wrong info earlier. The 230 HP 4 bbl motor is NHRA-rated at 220 with OEM heads and 230 with replacement head. I incorrectly wrote 200 earlier with OEM heads.

Re: NHRA Stock/Super Stock Classification
 

Bruno, the C8OE-J heads are the 2BBL heads and have a larger combustion chamber than the 4BBL heads. The 4BBL engine was 10:1 while the 2BBL was 9:1 which is why the chambers are larger. So, no, you can't use them on the 302/230 engine in S/S. The right heads are either C7OE-C or C8OE-F.

There are two aftermarket heads approved for the engine. One is a AFR #1299/165 and the other is an Canfield #18350. The S/S HP using the aftermarket heads is 230 while it it 220 if using the Ford heads.

Re: NHRA Stock/Super Stock Classification
 

I'm with Terry and I've looked at this as a GT / SS option for a Maverick. Go with the 1968 Mercury 302. Class break down is the same as the '68 Ford 302 4bbl

Re: NHRA Stock/Super Stock Classification
 

I am putting my '69 Camaro into super stock next year. I just need to know if IHRA's horsepower factor is the same as nhra's, and if I were to goto super stock production how do i find a combination to use?

Re: NHRA Stock/Super Stock Classification
 

IHRA Super Stock Production is pounds per cubic inch. Weight of the car with driver, divided by the cubic inch of the engine = the class you will run. If it fits into, say, SS/PAA-1 (7 pound class) with a 427, you would weigh 2,989 pounds.

In horsepower to weight categories, IHRA generally mirrors the NHRA ratings, but not always. As an example, the 1990's LT-1 in a Camaro/Firebird for SS/IA, it's rated 279 in NHRA and still at 275 in IHRA.

All the IHRA info, including people to contact regarding a question, can be found here.

http://www.ihra.com/competition/index.php

Re: NHRA Stock/Super Stock Classification
 

Bruno,

Actually there is no such thing as a "natural" class in NHRA SS/GT. Using the 12.98 weight break, the car's shipping weight is 2726. From there you can subtract a maximum of 250 pounds or add a maximum of 250 pounds to calculate what classes the car can fall in. With the maximum removal of 250 pounds the car won't make the top of GT/F(A) with the 230 hp engine but the car could:

run heavy in F @ 2670
G @ 2700
H @ 2815
I @ 2930
J @ 3045

using the 220 HP engine in would be:
heavy in G @ 2670
H @ 2700
I @ 2810
J @ 2920
K @ 3030
L @ 3140

This is using the data available as of today, 12/2/2010. Hope this clears things up a little.

Re: NHRA Stock/Super Stock Classification
 

so if t have a 83 grand prix (shiping w-3300) with a 327 nhra rated at 299
i can add 250 to it?
so 3550/299=11.87 which is gt/h or remove 250 and get 3050/299=gt/e
so i can run from e-h????

Re: NHRA Stock/Super Stock Classification
 

Yes, a 1983 Grand Prix Coupe 2 door Brougham's shipping weight is 3300. With a 327 rerated to 299 hp the car would run:

heavy in E @ 3220
F @ 3305
G @ 3455
H @ 3605