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BossHogg69 · 08-11-2017, 02:25 PM

You may have 36* total timing, but what do you have your initial timing at? What about vacuum advance? Is it hooked up and where?

What year are the 454 heads? What head gasket? Some issues may be there if using a Mark IV block (series flow of the coolant to the heads, which 396 is) with later Gen V/VI heads (parallel flow of coolant to heads) without the proper gasket.

08-11-2017, 02:25 PM	#13
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: Not Your Average Overheat Question You may have 36* total timing, but what do you have your initial timing at? What about vacuum advance? Is it hooked up and where? What year are the 454 heads? What head gasket? Some issues may be there if using a Mark IV block (series flow of the coolant to the heads, which 396 is) with later Gen V/VI heads (parallel flow of coolant to heads) without the proper gasket. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!! Last edited by BossHogg69; 08-11-2017 at 02:31 PM.