Set timing

BOBZILLA71

MEMBER
GMC

This is a 327. Medium cam, 650 sea demon carb, camel back heads. Tring to set timing but when I put the light on it I see all kinds of marks bouncing all over? Should I blackin out all the other lines exept the TDC line to get an acurate reading? And what is the correct timing to be set at? Thanks

3 Replies

LOSONE

MECHANIC
1,616 POSTS

If the light bounces and flickers it is caused by either a balight or a misfire on the cyl. Move the pick up closer to the distributer and see if that helps. That is a good engine set up.

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Monday, May 1st, 2006 AT 2:10 PM

BURRBRIAN

MEMBER
158 POSTS

If you have a mid-late 60's 327 your initial timing is 4 degrees before TDC. This info is on a 68 327 out of a camaro with eithier 275 or 325 hp motor. If you have a bunch of marks on your balancer you need to find TDC and then put your own mark on it and time it from there. You will need an indicator to put in #1 plug hole then turn motor-by hand- until piston meets the stop then mark that on balancer, then go oppisite direction until you reach the stop that way, mark spot and true TDC will be exactly in the middle of the 2 marks. You should be able to time from there. Chevy sb balancers have been known to have the outer ring slip and shift on them so sometimes the factory mark may not line up correctly. But you still need to get the light hitting right, too. Hope you made some sense of this, it's early and the coffee hasn't kicked in yet :shock: