How much would horsepower increase with a HOLLEY 465CFM or a 600CFM.

 

well odds are the 600 would be to big..cause i wanted to put one on my 13b 4-port and all the guys said it was not a good idea .... as for the 465 prolly open up a decent amount... the stock carbs on thes cars are horrible

 

Arent 13B EFI
Why would you have a carb?

 

my engine is out of a 78 ish rx4 the 13b you speek of is the 6port 13b in 84/85 gsl se so ya that why i have a 13b with a carb

 

The horsepower increase with the 465cfm Holley won't be that great with a stock-port motor, and the 600 cfm unit is only appropriate for engines with some pretty major porting. FWIW, a slightly reworked RX2 carb works great on RX4s. The '76-on 4-port 13Bs had pretty small stock intake ports compared with the '74-75 motors, which had the largest stock ports. If your motor is '77 or newer, it is from a wagon. -Mike

 

knowledge is power!!! but um im think the guy i bought it from said it was a 78..but i dunno he bought it from racing beat streetported back in the early 90's