Quote:
Originally Posted by wh33lman
So far the count is
60lb. pump - 7
80lb. pump - 4
...and 1- 60lb. pump shimmed to 70lb.
Let's see if I can provide more info from the build sheet
1975 455 + .030" bore - 3.25" main 4.210" stroke
Align honed - High Spec 3.439" "Align hone was out of round, Drill and Cut Caps, Align hone cam tunnel"
Clevite P-Series Main Bearings MS-667P-10
Mains Clearance - .0032"-0033"
Rod Br? Clearance - .0026"-.0027"
Piston -Venolia 4.175" Hone to 4.182" Desired Clearance .007" Deck Plate 100lb.
Rings - Hastings Piston Rings Engine Piston Ring Set 2M5529060; 4.185" Bore
I normally run 20W50 unless there is none in stock,
And I have 2- 60lb pumps - 1 setup with a stock pickup my stock pan, and another with a Milodon pickup for my new Milodon 30355 7 quart pan
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Just curious but where are you located?.... Edit- nevermind, just saw canada, that supports the info below even more-- Do you drive in super hot temps like a desert or extreme south or more normal temps with cool spring/fall driving? Do you drag race or run long endurance races at high rpms? Im guessing not since you said its a street car now... so I dont see any reason for a 80lb pump &/or 20/50 oil. What is the reasoning for that? Since you said its a street car, this would probably get better responses in the street section as opposed to the race section. I could be wrong but I also dont think those stated clearances are considered "loose" like a race motor build.
If a lighter weight oil provides adequate pressure then that is perfectly fine & usually better to use... especially for a street driven car that stays under 4000 rpm for 90% of its use. There is no benefit to using thicker than needed oil or higher than needed psi pumps. I would use a 60 and shim it if it makes you feel better, then whatever pump you decide on using, try a thinner oil like 10/30 or 10/40, if psi when hot is good, use that unless theres a legitimate reason to use 20/50.
I have the same milodon 7qt pan, its very nice but as mentioned I run 6qts in it, i marked the dipstick at a fresh 6qts & have never had any oil starvation issues at the track or on the street, but it does make changing starters a lot harder than a 6qt pan, at least with big 2" headers.