im looking for a 4 barrel intake manifold for a 1971 oldsmobile cutlass 350 with a 2barrel on it now and i am puttin a 4 barrel holley 600 cfm on it, any body

 

I just sold the extra one i had.I haven't seen you post in a while.How are you coming along with the car? Did you get some of those problems straightned out?

 

I scrapped all my stock 70's intakes.
I do have the 600 holley if you need it though.

 

PM sent

 

If you don't find one local I have one. PM sent

 

what makes an intake a performance intake? i have been looking at performance packages on my jegs magazine that come wiht the carb the intake the cams and lifters, seems like a good deal if i just wanted to get all the stuff new

 

The runner cross section area and shape are tailored to optimize performance in a specific RPM range. Low RPM performance and torque want longer, smaller cross section runners. High RPM performance wants shorter, straighter, larger runners. In addition there is the difference between single plane and dual plane intakes. The dual plane feeds four cylinders from each half of a 4bbl carb. This increases the signal through the venturi at low engine speeds to help with low RPM performance, but at the expense of high RPM power. The single plane allows each cylinder to see all four barrels. High RPM flow and power is better, but low RPM signal is weak.

 

so if i was to get a manifold from one of these guys that came off factory i mean would it be worth it if im puttin an after market carb on should i spend money on an after market manifold or would one of the cast iron factory be ok?

 

Your first problem is that a Holley 600 is a square bore and all the factory manifolds are spreadbore. You would need to use an adapter plate to run the Holley, which hurts flow and at least partially negates the benefits of the 4 bbl.

As to the question of which manifold to get, it depends on what else you plan to do to the car and how you plan to run it.

 

ok so then what carb do you suggest i get, the only reason i was going with the holley is b.c my good friend said i could get it for cheap so its not like i have to get it

 

I have heard lots of bad things about Holleys for a street driven car, great things about a q-jet if tuned properly. Q-jets will handle good power and get better gas mileage.

By the way, I have an old cast iron 4 barrel intake if you want.