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#21
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I would run a better weight oil that would help you oil pressure.
And I wouldn't run synthetic either as it seems like it would get passed the old type cork seals at the timing cover crank balancer. GT. |
#22
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Quote:
Push rods were always hollow so as to lube the top end against the rocker but that didn't move much oil. When the holes went in the rockers there was a lot more oil moving. Just try to adjust lifters hot and running and find out. ( I know that isn't the recommended method but we used to do it a lot.) I did get a slight improvement in pressure by going to 14/40 but not much. Maybe 1 lb. And I always use Mobil 1. Now using the high mileage formula as it has more ZDDP in it. I tried conventional oil in the 10/30 viscosity I had been using. But it did not help so I went to the 10/40. Maybe I'll stay with the 10/40 because the bearings are a bit loose as the crank was polished but has std bearing inserts. |
#23
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My '57 347 GMC (Pontiac) V8 ran about those pressures for 22 years and over 130,000 miles of daily driving. Maybe down to 10 PSI at 500 RPM idle in really hot weather with the A/C going.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
#24
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I of course still have the rope rear main seal, but I Had the timing cover machined out to do the new style crank seal. (Bill Hanlon thank you). I am also running one of those oil filter adapter plates also. I do notice that if my oil level gets a little low the oil pressure lowers.
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#25
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That's because the oil is warmer. Smaller amount of oil dissipating the same amount of heat.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
#26
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every other time I had a leak I blamed the gasket. funny that. way back when, when the gasket and seals were newer and synthetic was not yet on the market . |
#27
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Build the 317! Notably for its small main journals and reverse flow cooling.
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1970 Lucerne Blue Firebird Trans Am, deluxe blue interior. Original Ram Air III, M-21, 3.73. Being built as a 4" stroke "434" with SR 614 Ram Air IV heads 1972+ Lucerne Blue 4-door hardtop "what if" T-41 Le Mans Sport GT/Grand Am concepts. Equipped with future 3" journal "455 HO"/"what if" prototype "SD 455". What if GM had continued production of the 1970-72 GM A body somewhere in the southern hemisphere? |
#28
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He hasn't been here since 2014, chances are he won't see your reply...
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