03-02-2009, 07:25 PM
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CC Member
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Join Date: Aug 2006
Location: San Diego,
CA
Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
Posts: 1,066
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Not Ranked
My 434, which is very close to the 427R but with bigger heads and a more radical cam used to have the same issue with the 2000 rpm barrier. I had a guy here in So.Cal. that deals with a lot of these motors swap out my carb to a Holley 4150 HP Series with no choke and billet metering (sp) blocks. Since the swap the car is much more drivable and it dropped the idle down to about 900rpm's. It's a little cold blooded with no choke, but overall it's a much better setup now. It also seems to pull harder on the top end now as well.
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