gstang71

I have a 670 cfm Holley Street Avenger carb, it works fine, although not a double pumper it does have daul feeds.

gstang71

Here is what it looks like. Its on my 71 stang with a 351c.

gstang71

double post.

gstang71

Here it is for reals! Lol

[IMG]local://upfiles/87168/79AD1D193925452D9E31D12982483C7F.jpg[/IMG]

SalikDDD

just got that carb for my 331 since it'd be running lots of 1/4 miles and still have some streetability

lynwood78

Thanks for the reply i knew 750 would of been too much. God I need new friends haha

67mustang302

Street engines are far better off being slightly "under-carbed." You might lose 10-20 peak hp, but the overall upper rpm power band average stays similar, however the smaller carb will get much better mileage and throttle response, and run better at lower rpm. Carb's are NOT there to meter air going into the engine, they're there to meter fuel. They do that by signal, and smaller carbs make more signal. There is a point where going too small will hurt power everywhere by strangling it, but you basically can't buy a a 4bbl today that's that small, even for a stock 289.

kalli

that's probably why the autolite 4100 (480cfm) sells like mad ...