Good deal Ricky. Yes, the 500cfm works very well on mildly built 318
Poly’s. I did a back to back dyno test with one of my 396” Stroker
Poly motors using an 850cfm double pumper Holley and then one of my 500cfm
Edelbrocks from a dual quad setup; amazingly, same HP & Torque at every rpm
level but for a “1” HP and “1” Torque difference at one rpm
measurement...which means identical and that on “this” test the Stroker didn’t
want any more than what the 500cfm carb was delivering...air hat bore testimony
as well.
Gary P.
From: Hall, Ricky L
Sent: Monday, August 28, 2017 7:28 AM
Subject: 500 CFM vs 600 CFM Carburetor for the 318
Poly When
debating recently to try a 500 CFM carb I got conflicting input – most peeps
here said stay with the 600 cfm. My brother also said it would not make
that much difference. Called the
Edelbrock support line and the rep said 600 cfm – even though their selection
chart clearly shows 500 cfm. http://www.edelbrock.com/advertising/Literature/Misc/EDL_Carb_Application_Chart_03186.pdf I asked
the local Honest Performance and they said my 318 would have better throttle
response and still have good power with the 500 CFM (Edelbrock 1403). I
also read this posted on several forums. And it certainly does.
This car
always had eye burning exhaust smells when driving and when parked in the garage
hot. This is with a freshly rebuilt 318 Poly with a mild cam. Added
a phenolic spacer and that helped with the smells when parking – and better
start-up cold since it helps the gas not boil away – keeping the carb
cooler. But still had exhaust smells driving – seems much better driving
and parked now with the 500 CFM. Even driving around with the rear
tailgate window open now, hardly notice the exhaust smell. No worse than
any pre-catalytic converter car. First cold
start this morning with the auto choke it started scary fast. ;
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