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Author Topic:   What is restricting airflow the most?
Dirt Maniac

Total posts: 120
posted December 22, 2004 02:39 PM  
Ok every engine comes down to one part choking the engine the most. Running the following set up in a 355 SBC. What is the restrictor?

K&N filter
500 cfm carb
marine high rise intake
Vortec 062 heads 1.94/1.5
ram horn exhaust manifolds

And lastly, what is the best solution to fixing it.

Dirt Forum Champ
Total posts: 968
posted December 22, 2004 03:49 PM  
Probably the port match between the early style intake and the vortec heads.

Dirt Freak

Total posts: 428
posted December 22, 2004 05:10 PM  
I'll go with the exhaust manifolds first and intake to heads as second biggest problem. What size pipe and how long after the manifolds? Do you have an H, X or Y pipe in the exhaust about 3-4 feet behind the engine? That will help scavenge poor flowing manifolds or heads (but the Vortecs should be at least ok).

If the 500cfm carb is a Holley 4412, you should be ok carb wise. Quite a few classes limit cars to that carb.. even with 400+ CID and they manage 6500rpm out of them.

Dirt Maniac

Total posts: 120
posted January 03, 2005 05:48 PM  
Ok....sorry for taking so long to get back. 500 cfm Rochester carb is the max allowed by rules. Exhaust is 2 1/2" and it at max 5' from manifold to end. And no we are not running an X, H, or Y in it.

Dirt Freak

Total posts: 226
posted January 06, 2005 06:53 AM  
Are you running a set of corvette ramhorns? I would look for a set of those if not, flow alot better


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