I'm going to start working on my 355 TPI to Carb swap soon!! I need to know what opinions people have on which carb I should go with for my setup.....600 or 750 (definitely edlebrock)!! The engine will be a 355 with vortech heads (possibly ported), an edlebrock performer RPM intake, a comp cams Xtreme Energy flat tappet cam with a .477/.480 lift and a 224/230 duration, aftermarket ignition, and of course whatever edlebrock carb is decided upon!!

 

(I was kidding since you don't believe me anyway)



[This message has been edited by The ODB (edited February 23, 2001).]

 

I think with the setup mentioned the engine will breathe just fine for me!! It's gonna be a daily driver anyhow!! Also, I have a budget limit! If I had all the money I wanted I wouldn't be swapping from TPI to carb in the first place! This setup is just a "for now" setup! The TPI WILL be going back eventually! But for now, I need to know which EDLEBROCK carb I should use...the 600 or the 750??? Thanks in advance to anyone who actually answers my question!!

 

guess what its me!! heheheheh i get as i told you a 750!!!

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 160 (882) heads,.447/.447 lift 222@.050 duration speed pro 327/350hp cam 350 .40 over (356) edlebrock performer rpm intake and a 600 edlebrock manual choke (1405) Proform H.O. distributor slightly revised 700r-4

Future mods comp extreme energy roller cam, world products sportsman 2 heads, msd 6al ignition, billet distributor, blaster 2 coil and a 406 engine is in the works soon!!!!

 

What will your redline be? That will determine a lot. However, assuming 85% Volumetric Efficiency, and a 6K redline, here is the equation
([CID * (Redline/2)]/VE)/1720 = CFM needed

Plugging in your numbers

([355 * (6000/2)]*.85)/1720 = 526 CFM

Given those values of 6000 and 85% VE, you shouldnt need more than a 600.

Here is another equation for finding out upto what RPM your carb can handle. Assuming 600 CFM and 85% VE.

([(CFM * 1720)/.85]/CID) * 2 = Max RPMs
([(600 * 1720)/.85]/355) * 2 = 6840 RPM
ALMOST 7K!


However, for the grins of it, and because lm bored, the 600 CFM can support your monster at 100% VE upto 5814 RPMs.

[(CFM * 1720)/ CID] * 2 = Max RPM
[(600CFM * 1720)/355] * 2 = 5814 RPM

l'll let you make the call

Clayton

 

finaly some one else puts thet formuly up when people are trying to decid on the proper size carb. 600 cfm is ALL you need

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when the green flag drops the bull$hit stops

Curent: 350,performer RPM intake ,650dp, 700r4, headers, 3inch exhast
Spring 01: 406, Comp 282 solid cam, 2400 stall converter, every thing else the same.

R.I.P #3