Hello, im new to this forum and I need some advise from a few tried and true engine builders. I'vebeen building and helping friends and family build engines and hotrods since I was 13, so i only has 14years but im more familiar with sbc and sbf.anyway... I've been helping a buddy build a 77 f-100 for his father inlaw. We built a 72 460 all forged rotating assembly, flat top pistons, a set of 1968 429 thunderjet head which have been reworked for bigger cam, and the have screw in studs and guide plates, all comp cam valve train including, big mutha thumpr hyd flat tappet cam Kit, a set ofcomp1.72 roller tip rockers,weiland stealth intakes 750 Holley, vacuum secondary carb, hedman headers, 3in xipe w/ flowmasters, truck has a c6 with shiftkit a 4.10 gear with 32x10.50-15.
Ok so the problem is I think the carb maybe too small on the jetting or cfm.the truck just doesn't seem to making power it should (v8 mountaineer launches better) and the thing could hardly do a burnout, and didn't start pulling till about 3,000-3,500 rpm. So I did the first thing I learned about modified engines, add i checked the plugs. They were all the same color as one other, but were really light , from being lean. I bumped up the jet from 72 to a 76, helped alil bit (it would do a little burnout but wouldn't rev past 3-000rpm in first gear. The timing is pretty mich spot on and didn't change performance for the better I have it about 10 degrees right now so I can get it to start. The carb idles good revs up great in park, it was brand new right out of the box, . Any input would be appreciated, (going broke buying carb gaskets and advil)
Ok so the problem is I think the carb maybe too small on the jetting or cfm.the truck just doesn't seem to making power it should (v8 mountaineer launches better) and the thing could hardly do a burnout, and didn't start pulling till about 3,000-3,500 rpm. So I did the first thing I learned about modified engines, add i checked the plugs. They were all the same color as one other, but were really light , from being lean. I bumped up the jet from 72 to a 76, helped alil bit (it would do a little burnout but wouldn't rev past 3-000rpm in first gear. The timing is pretty mich spot on and didn't change performance for the better I have it about 10 degrees right now so I can get it to start. The carb idles good revs up great in park, it was brand new right out of the box, . Any input would be appreciated, (going broke buying carb gaskets and advil)