SS Modified

[Michael Compton]

I know several guys who simply change the designation on their window from BS to CM without changing anything. Weight break is the same only difference is .15 in index.

I can only assume it is legal to run CM with 1 carb.

[LethalRat]

To crossover from SS/AS - SS/CS possibly or Comp Super Modified classes. Could probably run close to the index, sure it would be down on power from a dual carb set up.

Don't know if anyone has do that or is legal with with one carb.

[Tracy Robbins]

You can definitely run under the index w/ a single carb. I used to run SS/PCA in IHRA, which is a single dominator that would fit in SS/BM at NHRA events and could run a couple tenths under but that's it. There's usually around 30 more hp w/ two carbs but I didn't have $2000 for another intake plus the cost of a set of carbs.

[PONTIAC'S REVENGE]

I heard from guys during PRI show the part number rule was thrown out and any head is legal in modified now? I'm sure there's limits like sohc or dohc maybe? Anyone know?

Sorry if I'm missing something. I've been out for a while. Just getting back in with new car. ��


Stacy

[71mavlouisville]

The rule was changed to state aftermarket heads allowed, but, they still would have to be NHRA accepted aftermarket head and listed as an accepted head with the part number of the accepted head.

Currently there are none listed.

You will have to go through the acceptance process to have a head accepted.

[PONTIAC'S REVENGE]

Well if any aftermarket is approved but there's acceptance required then It's just a question of rulebook semantics. Nothing different.

Also do they allow any bore spacing now? I heard sbcs but not bbcs?

Stacy

[Jim Caughlin]

Originally Posted by Michael Compton

I know several guys who simply change the designation on their window from BS to CM without changing anything. Weight break is the same only difference is .15 in index.

I can only assume it is legal to run CM with 1 carb.

Maybe the rules are interpreted different between divisions but I know for a fact up here in div 6 that at least one car got booted for running a single 4 in Modified, he was told Mod Stock was single 4, Modified was multiple carb only. Div 6 & 7 have been pretty specific that you can't switch between the classes. As the saying goes "your results may vary"...

[Hacksaw]

Originally Posted by LethalRat

In SS Modified where they say 2 4 bbl carbs or 3 2bbl carbs maximum, would they allow a single Holley Dominator carb or a single Holley 4150? SS/AM - SS/GM

Still waiting for an answer that would satisfy the Tech crew. Somebody?

[Chevy55]

Originally Posted by Hacksaw

Still waiting for an answer that would satisfy the Tech crew. Somebody?

The rule reads "Maximum", so to put your mind at ease you'll probably have to call div. tech.

[Billy Nees]

From 2015 Rule Book,"Two NHRA-accepted American-production 4-barrel or three American-production 2-barrel carburetors maximum. Inline 4-barrel carburetor prohibited. Fuel injection prohibited."
It doesn't give a minimum. One 4-barrel is legal.