Opinions on these carburetor restrictors....

RustyRatRod said

I find these kinds interesting, but wonder if they will really change flow, or of they just disrupt everything? These would be good for slant six people wanting to convert a 600 to a smaller carburetor. IF they really work.

CARTER EDELBROCK AFB 600 to 500 CFM CARB RESTRICTORS PRIMARY SIDE | eBay

Click to expand...

When I was running a slant six, I used a 390 Holley vac secondary, (same carb we’re running on Jason’s 318 now).

It worked very very well with a header and a mild cam.

I also ran a 450 mech secondary and a 650 vacuum secondary on the “hotter” six I had.

The 650 fed it better, but the 390 was a WAY better compromise on the street.