can anybody tell me what size jets i should run in a stock 4 port 13b? rb 600 carb on 75 repu. carb was setup for streetport when i got it.

 

i dunno myself what jets u should run, but that seems like a big carb for a stock port... good luck... i had a 600 cfm holley on my 74 repu, street ported 13B, put it on my 6 port street port for my FB now... but i don't have a clue what jets it has heh

 

i plan on porting the motor. my dilema is the truck is far away and i would rather drive it home than tow it. the old hitachi crapped out.

 

you are probly gonna want about 60s for the primaries and around 62s for the secondaries...cuz i ran 56s on my holley 600 for my stockported 12a and will run about mid 60s-70 on my 1/2BP 12a (if i ever get it to run!)

 

I have an 86 6 port 13b and I have 64 primarys and 66 secondarys I think I can still go lower maybe like 62 64 I need to get a wideband or go to the track and find out lol.

 

I run 70 primaries on my Vaccuum Secondary 650CFM on my Street Port 13B. My accellerator power pump is .31 I think. I ran stock 64's and it wasnt enough fuel. It would bog in the low end and run lean. It leans out a little in the top end, but its much better.

I dont use a Racing Beat Modified. Couldn't justify the price. When I could get a normal regular Holley and modifiy it for much less.

 

you should run 68P and 69S and plug the power valve. Nothing lower than a 67.