I just bought a 73 camaro, with a blown S.B. in it. my question is, is it normal on first start up, to have a big puff of gray smoke out the back. it starts easy, and doesnt smoke after its running, im new to this blower stuff, so not sure if its normal, or maybe something is wrong. a little detail. 350 cu in, 81/2 forged pistons, 671 blower with @ 10-12 lbs boost. 2 750 double pumper holleys. MSD ign, thanks T.