Inliners International Forums General Discussion Engines 4 brrl on 250

0.2 sec and 2 mph gain in the 1/8 mile

I just converted my stock 250 to a 4bbl.
Started off as a stock 250, stock single exhaust, powerglide-3.08 Nova.
Tried both Clifford 4bbl intake and also the Offy 4bbl intake.
Tossup between the Clifford and Offy intakes, but both of them gained a clean 0.2 sec and 2 mph over the best 1bbl intake and carb setups I had.

That change equates to a gain of about 0.3 sec and 3mph in the 1/4 mile, and calculates to a gain of about 15hp in the Gonkulator from just adding the 4bbl and intake.

I tried many different carbs on each intake so the above is just a summary. One interesting note, during all this thrashing, the 4bbl setups got BETTER gas mileage than the 1bbl Rochester carbs.

Is it worth it if you're buying the intake and carb new?
Well, you have to decide that for yourself.