Ive got a 1986 z28 with a 305 im rebuilding the engine now ive got a high rise single plane intake and i was wondering what size carb would be the best.

Thanks
Joe

 

If you're sticking with the 305 and you aren't going incredibly radical, a 600 CFM should feed it fine.

 

What carb do you have now? What cam, heads, and exhaust are you running? What transmission, stall (if automatic), and gears are you running?

What is your intended use of this car?

These are all questions that need to be considered before you can really decide what carb to use. From what little info you gave, I'm guessing your intake manifold is going to be a bad mismatch with the rest of your combo, and you'll be very disappointed with the way it runs.

 

HITHERE'm still building it and im going to use it on the street but ive got 350 heads, 700r4 transmission, HITHERE was planning on getting headers, flowmasters(true duals) and pretty big cam.

HITHERE was thinking about HITHERE holley double pumper 650
and why the hell does it keep sayin HITHERE HITHERE said high rise....

 

http://www.professional-products.com...vyv8.htm#52030 & 52031
this is HITHERE picture of the intake ive got

 

For the street, you should really stick with HITHERE dual plane intake manifold.

It's pretty hard to beat the CC q-jet. You'll get better gas mileage, more flow potential than HITHERE 650 DP (although you probably won't need it all), and your transmission torque converter lockup will continue to operate.

Spell this backwards "sloof lirpa" ( HITHERE ).

 

Noooo im gonna drive it on the street but its gotta be high performance and HITHERE dont really care about gas mileage

 

I'd still say stick with a dual plane intake manifold. There are magazine articles that show a peak power increase by changing to a single plane on a 305, but that isn't the whole story. Peak power is good for bragging rights, but it doesn't hold much water if you're getting beat while getting up to your peak power.

I'm also a little freakish about budget. Why spend $500 on a carb & distributor, when you would be better off spending that money on things like exhaust, cam, heads, air cleaner - things that will make a difference in the power that it puts out?

To put it a different way: Spend your money on improving the heads, cam, intake manifold, exhaust, high stall torque converter, and air cleaner. And a little on ignition improvements like coil and module. Drive it like that; take it to the track; record performance. Now, spend another $500-700 on a different carb and distributor, plus something to keep the TCC functional, and drive it and take it to the track. What you'll find is that the extra $500-700 didn't produce any improvement (although it will change the way it drives, and will reduce gas mileage).

A better plan would be to not buy the carb & distributor, and send the $500 to me. I'll put it to good use.