2bbl to 4bbl switch
 

Hey guys I run a dish piston 305 2bbl combo and am switching to a 4bbl, how much can I expect to pick up by just changing the intake and carb? Carb is a dean Oliver quadrajet. Any input is greatly appreciated. Thank you

Re: 2bbl to 4bbl switch
 

Ya know that you've got to change the heads and cam too, right?
If you're just changing the intake and carb to "play" with it, about 7-8 tenths.

Re: 2bbl to 4bbl switch
 

Thanks billy, that's what I was wondering, I know a cam change would be beneficial, I never even considered the heads. Thank you

Re: 2bbl to 4bbl switch
 

Unless you've got a 4V cam in the motor, a cam change would be mandatory. The 2V cam spec is bigger than the 4V cam spec.

Re: 2bbl to 4bbl switch
 

The specs are the same, the only difference is the intake valve is bigger in the 4bbl. This is a 78 nova chevy 305 2bbl combo going in a 79 malibu 305 4bbl

Re: 2bbl to 4bbl switch
 

Well OK then.