I would say it could be inproperly adjusted valves also. Are they roller rockers or stock rocker arms. Also, until recently, I thought you should have a breather on one side of the motor also. But it was pointed out to me, that in a mildly beefed up or stock motor, that basically causes a vaccum leak at idle. Do away with breather if you have it, or take a hose from that hole back up to the air cleaner. Readjust the rockers using 1/2 to 3/4 turns after finger tight. Also. did you adjust them when both valves on that cylinder were completely closed? If not do so.
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1969 fast back; yellow; weld wheels; 302 roller with GT-40 heads; 3:55 gears; 5spd T-5; MSD 6AL; E-303; flows; Hedman headers; Holley 600;Weiand Accelerator;1.6 rockers
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