Originally Posted by 64ssForever
DO i have to use plastigage or mic the bearings on the crank if im using a new crank and new pistons and rods?
Yes- you or your machinist has to verify that the oil clearances w/the bearings that you plan to use are within spec, and that the machining done was done right, i.e. no taper, out of round, etc..
Also what do they mean when they say check your crank for play when you put in new pistons and rods?
End play (aka "end float") is measured w/the crank in place and the thrust bearing seated by driving the crank fully to one end, then fully back to the opposite end, then measuring the top and bottom thrust surfaces. I'm sure there are tutorials on this on the 'net.
It is best measured for total as well as each half of the thrust bearing to be sure the load is "shared" by the two bearing halves.
Then there is the rod side clearance that has to be checked to be sure the rods are close enough to each other on each crank journal, but not too
The three most common locations for the timing mark on the damper:
does the damper on the 350 sbc have different timing marks for different years...i have a 80-85 and the tdc is at 12 oclock and i cant read the timimg pointer which is at 1 or 2 oclock...can i just buy a newer damper or do i need the old timing cover?
The pre-'69 damper has the TDC mark 2º before the keyway in the ID of the damper.
The damper used from '69 to mid-80's is 10º before the keyway. You'll find that aftermarket dampers are the 10º type, as are the tabs sold in the aftermarket unless they're adjustable.
The third timing mark used from about 1986 to about 1991-'92 is 40º before the keyway. IIRC, this damper uses the timing cover tab @ 12 o'clock.
If you're unsure, or just want to check the accuracy of the tab/mark for TDC, DETERMINE TDC
and MAKE A TIMING TAPE
will help you to see for yourself.