IHRA SS Production??

[Karl Owens]

The rules aren't very clear, can you take an existing NHRA/IHRA SS combination and add sheet metals and dual carbs? Pistons? Head volumes?

[Ron E]

You could do that. But, S/S production classes allow OE part numbered race heads, aluminum rods, titanium valves etc. They are closer to a comp engine than a NHRA S/S. No runner volume. Pistons are wide open. I'm not sure if they still have 2-4bbl classes. I know they have a single 4bbl and 2bbl classes.

[Tracy Robbins]

Super stock production is very similar to modified because you are allowed to use a corporate match aluminum head and sheet metal intake. No brodix, dart, etc... The major difference is you have to maintain stock bore and stroke w/ .070 over bore allowed and .015 allowed on the stroke I believe. So unlike modified you aren't allowed the big bore short stroke and 2x4 set up. Also, carb requirement is a single 4 barrel or a single 2 barrel. If using a 2 barrel you are not allowed to use a vacuum pump. This is a summary but hope it helps.

[Karl Owens]

I have a Pontiac 428 based combination, NHRA legal Edelbrock heads (castings) By NHRA rule book the heads aren't legal in SS/AM because they don't have an OE part number, but in SS they are allowed to replace an OE part number. I don't see anywhere in IHRAs rules where they address this. My combination would be an NHRA legal super stock combination ignoring the piston and head volume rules.

[Tracy Robbins]

You are required to have an OE part number for production SS just like modified if I'm not mistaken, but you may want to talk to Mike Baker to be sure.

[Adger Smith]

At one time I was thinking about running a set of Olds heads on a SBC (Skoal Bandit era) in SS production. I had sent a picture to Mike Baker and he approved them. They have a GM casting number. See picture.