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20advance 02-20-2010, 08:33 PM I have just installed a brand new 6.5 long block in my 94 GMC Suburban and have some ? about the timing. I have read or heard of some #'s to shoot for when I take it to the dealer to get it timed. Is this something to wonder about or not. Thanks 20advance ak diesel drive 02-21-2010, 12:21 AM factory spec are somewhere around -.25 thru -.85 most people like more. Max performance is -1.94 but it is extra rattly 20advance 02-21-2010, 07:56 AM If I have it set for max performance will it shorten the life of my NEW engine. All it does now is pull my travel trailer about 4-5 times per year. Thanks for your reply 20advance ak diesel drive 02-21-2010, 11:07 PM shouldn't | ||