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I have a stock 340 cast crank only harmonic balancer

yes I changed wires and cap

It is not oil and I checked compression 150 on #1 160 on #3. I put the intake back on today looked at the plugs again 1 and 7 are lean 3 and 5 are rich 2 4 6 8 all look good. I have checked everything I can think of and talked to my engine builder he has been building engines for 50 years and...

the 340 is 40 over the j heads have been ported and polished with 208 intake 160 ex. thumper cam 486 intake lift. 473 ex lift. adjustable roller rockers. air gap intake dual plain. 750 holly

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...

my number 1 cyl. is very very lean

all msd ignition mechanical dist. 780 holly vac. rn12yc champion plugs

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.