carb swaping help
#1
carb swaping help
My neighbor has a bone stock 68 Cutlass with a 350 2 barrel carb. He has recently just ordered a 4 bl Rochester carb to go with a used stock 4 bl intake manifold. He has yet to install since he needs to hot tank the intake. My thinking is that he will need new linkage and fuel lines. Is this correct? Are there any additional parts he would need? By adding just the intake and 4 bl, what kind of power increase would that net? Thanks for any info you can give me.
#2
you/he won't gain a lot from a 2-bbl. to 4-bbl. swap, assuming the carb. is calibrated for the application. in '68, the factory 4-bbl. equipped cars had an advertised 10.25:1 compression ratio vs. the 2-bbls. advertised 9:1 compression ratio. the distributor advance curve is a little different and the 4-bbls. had bigger valves.
the linkage and fuel line(to the carb.) is bent differently. and iirc, the 4-bbl. uses a different fuel pump.
bill
the linkage and fuel line(to the carb.) is bent differently. and iirc, the 4-bbl. uses a different fuel pump.
bill
Last edited by BILL DEMMER; September 18th, 2008 at 06:51 PM.
#3
you/he won't gain a lot from a 2-bbl. to 4-bbl. swap, assuming the carb. is calibrated for the application. in '68, the factory 4-bbl. equipped cars had an advertised 10.25:1 compression ratio vs. the 2-bbls. advertised 9:1 compression ratio. the distributor advance curve is a little different and the 4-bbls. had bigger valves.
the linkage and fuel line(to the carb.) is bent differently. and iirc, the 4-bbl. uses a different fuel pump.
bill
the linkage and fuel line(to the carb.) is bent differently. and iirc, the 4-bbl. uses a different fuel pump.
bill
#5
Bill and Joe, thanks for the replies. I know he was hoping to make the car a little more powerful. He'll be happy to know he should be able to bolt the swap right in without any additional parts. Is a distributor recurve neccessary? Any tuning hints I can pass on to him?
Thanks again.
John
Thanks again.
John
Thread
Thread Starter
Forum
Replies
Last Post
joepenoso
Big Blocks
4
July 19th, 2013 12:44 PM
jmac69cutty's
Drivetrain/Differentials
4
March 17th, 2009 05:11 PM