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I have a 70 340 all new. new holly 750. new msd coil dist. cap wires 6al box .but The number 1 cyl. is very lean and the number 3 is very rich all the rest are ok . has a miss when cold runs good after it warms up . I have rechecked everything it all looks good and has good compression after a...

I have a 70 340 40 over 9.5 to one pistons j heads with 2.08 intakes 160 ex. ported polished roller rockers port matched air gap intake 780 holly all new . all work done by a great racing engine builder . but it is not running up to par . I pulled and changed the plugs twice and some are lean...

does anyone know anything about this cam the part number on the end of the cam is 221285. It came out of a 340.