My new carbed setup will consist of:

-355 ci block
-10:1 compression
-Comp hr cam (282/288 adv dur, 230/236 dur @ .050, .510/.520 lift)
-AFR 195cc heads, milled to 64cc chambers
-Edelbrock Performer RPM Air Gap intake manifold

I was looking at a Holley 700 CFM double pumper carb with mechanical secondaries. Do you guys think this is the right size carb for my setup, or is it too big and will it kill my throttle response? Any help would be greatly appreciated. Thanks in advance.

 

i'd say the 700 will be fine, even up to 750, but i wouldn't run a mechanical secondary unless you have a manual trans.

 

I agree, 700 cfm should suit your engine well, especially with your cam.

 

zippy, why wouldn't you run mechanical secondaries on an automatic? Thanks again.

 

The engine has to be spinning in the power band when the secondaries open. With vacuum secondaries, that takes care of itself (when properly set up). With mechanical secondaries, you either need to rev the engine above that as the clutch is engaging (manual tranny), or have a torque converter that has high enough stall to be up in the power band (auto tranny). Otherwise, bog city.

 

he pretty much covered it. another advantage is traction as well as bog can be controlled with the sedondary opening time.

 

Thanks for the replies. Can't a mechanical secondary carb be tuned to avoid bog like that? Plus I have a torque converter with a stall that goes to the beginning of my power band. Thanks again.

 

btt please