Muncie4sp

Just want to be sure I have this right before is slap the rest together

1996 lt1 motor. heads/intake off. Just a simple H/C swap.

#1 piston all the way up
cam dowel pin @ 9
cam gear dot @ 12
crank gear dot @ 12

Is that correct for TDC #1?

Chimera96

no

# 1 @ TDC
cam dowel at 3 oclock
Top gear dot at 6
Bottom gear @12

Muncie4sp

#1 is up
ill spin the cam so the dowel is at 3
cam gear will be at 6
crank will remain the same at 12

Injuneer

Shoebox has an illustrated cam install guide:

4th Gen LT1 F-body Cam Install

http://shbox.com/ci/sprockets.jpg

http://shbox.com/1/cam_timing_ani.gif

shoebox

Yes, that is correct for #1 TDC

This is #6 TDC.

Muncie4sp

just goes to show if you think long you think wrong.

Thanks

Chimera96

....I followed the procedure in "How to Rebuild LT1/LT4 by Mike Mavrigian" when I assembled my short block. Both #1 and # 6 pistons are "up".....when I installed the top end and proceeded to lash valves I then rotated motor so both I & E valves on #1 were closed and started on #1 cyl for the valve lash

apologies for assuming #1 was TDC following the procedure in the book...as it was #6

I think the author advised doing it that way so it is easier to see the dots top gear being at 6 and bottom gear being at 12 to see alignment better vs having both gear dots at 12 position....

shoebox

Yeah, dots together are easier to visualize and is the most common way to set the gears. If you were doing a traditional, old school SBC, dots together would be #1 TDC (at least I think I remember it being that way ) .

terminal_crazy

Yeah,that had me scratching my head when I rebuilt the LT1 and work out which cylinder the opti was pointing to.