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tomschaner
10-24-2000, 08:06 PM
since i'm still fascinating that one day my 67 van 90 may be road worthy i'm curious i've rebuilt the 250 six cyl and added a higher lift cam to up the horsepower should i opt for the four barrel setup?i've been told that offenhauser makes a manifold for this application.have any of you vanners upgraded to this setup?hows the performance increase?what size carb did you go with?is it worth the bang for the buck?let me know so i can sart saving my pennies today.

Vanner68
10-25-2000, 04:26 PM
OK, here's the poop- the 4 bbl work well, but get the smallest 4 bbl you can find. if you do the math, 390cfm is about right. Holley makes one but it's a special order item at most speed shops. A friend of mine built a 250 way back in 78 and as I recall, it kept up with many V8's. Just remember, any performance increase may also increase engine heat, so review the overheating topics for ideas if you have this problem.