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Old 08-15-2002, 02:31   #1 (permalink)
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250 help

can any 1 tell me how much i would gain if i put a 350cfm holly carb on a cast iron head or alloy head.
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Old 08-15-2002, 02:49   #2 (permalink)
Two SC 61's = trouble
 
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There always seems to be a flat spot with Holley's. But I found a few years ago when I put a Holley 350 and redline inlet on an X.D 6 I didn't have to hardly kick it down to get the thing going quickly.Fuel consumption improved. I would use the X.F carby / inlet.. Plenty at Pick and Pay Less.. Take a good tool box,big enough....
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Old 08-15-2002, 04:16   #3 (permalink)
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Swapping the single barrel carb for a twin will make a difference on a 250. I have a 465cmf Holly 4bbl on a worked 250 and after proper tuning on a dyno there is a hugh increase. However on a stock engine I think the standard webber from an XE or XF will work better then the Holley because it is already tunned and jetted for the 250.
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Old 08-19-2002, 02:07   #4 (permalink)
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thanxs for ur help guys and also would a diff ratio of 2.77 lsd make the motor struggle much.
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