06-26-2021, 11:23 AM
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CC Member
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Join Date: Oct 2007
Cobra Make, Engine: Superformance, Roush 402R
Posts: 303
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Not Ranked
The guy who checked out my car is a respected engine builder and in the time we had he determined that the problem 100% lies within the carb. So even if I had access to another carb to try out (I don't), all I'm more than likely going to find is that it's my carb and then I'm back to square one. Rebuild again or replace. The powervalve was never changed so it's size should be a moot point as it worked fine before the rebuild,
For another rebuild the mechanic is an hour away, I'd have to leave the car all day and if another rebuild doesn't work it'll be more time and money out the window. AND FOR THOSE REASONS..... I think I'm just going to bite the bullet and get a new carb and install it myself. :-)
He recommended a Holley 0-4777 650cfm double pumper which has mechanical secondaries and I'll probably go with an electric choke again.
I was just on the Holley website and their simple calculator recommends a 750cfm double pumper. For street driving and the occasional spirited driving do you think the 650cfm is more than enough for this engine (Roush 402R) or is the 750cfm a better choice? Thx!
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