boost vs compression/ring gap/heat
10-20-2019, 03:04 PM
#31
Bone stock LQ4 with ARP head studs and LS9 head gaskets.
Boost spike over 20PSI while tuning it. I wasn't present at the time it happened.... The pump gas in it was also old. I had just put 80Lb injectors on it just prior to this
Mileage had to be over 150K, Barely any crosshatch left. #2 and #4 cam bearings had the oil hole's restricted and I didnt like the wear on a few of the lifters.
I rebuilt it with a light hone, 2 used rods and pistons, all new gaskets, new seals, new cam bearings, New Lifters, an XR269HR (comp 54-414-11) cam I had laying around and LS6 valve springs.
Boost spike over 20PSI while tuning it. I wasn't present at the time it happened.... The pump gas in it was also old. I had just put 80Lb injectors on it just prior to this
Mileage had to be over 150K, Barely any crosshatch left. #2 and #4 cam bearings had the oil hole's restricted and I didnt like the wear on a few of the lifters.
I rebuilt it with a light hone, 2 used rods and pistons, all new gaskets, new seals, new cam bearings, New Lifters, an XR269HR (comp 54-414-11) cam I had laying around and LS6 valve springs.
10-21-2019, 08:56 AM
#33
My old 6.0 that i ran in my black truck was gen 4 rod, stock flat top piston, rings gapped at .021 top and .023 bottom, ls9 gaskets, 243 heads that were cut .030 and i ran that setup on pump 93 with twin 625 nozzle methanol on 100% M1 in the boost cooler tank and 10* of timing. Ran it that way for over a year and then had an unfortunate mishap and blew the hose off the map sensor and well, you know the rest of that story.... i had an oil pan full of pistons, pins and rods!!
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