what grade oil?

[wright on]

Hey guys stupid question here. I want to change out the oil in my newly purchased boat well new to me its a 78. It is running a 454 with a B
& M Blower set up. what grade oil should I run. Old receipts says 20/50 is this right? Thanks for getting me out to the water.

[BOOGEYMAN]

Thats what I run in my 502....20/50.

[W.O.T]

i run valvoline 50wt racing oil. i dont think multigrade is really necessary for my application. my builder recommended valvoline 40wt but i havent seen it on the shelves anywhere

[lilrick]

i run valvoline 50wt racing oil. i dont think multigrade is really necessary for my application. my builder recommended valvoline 40wt but i havent seen it on the shelves anywhere
I agree with WOT this is what I run.

[centerhill condor]

castrol 20/50 summer and 10/30 winter...

[Big Otis]

Redline 30 WT SAE (10W30)
"Suitable in well-balanced racing engines for sustained high-speed use where low internal friction is desired. Popular in bracket engines, 355 Sprint Car engines, and World of Outlaw 410 engines."
I have been Happy with Redline Oil.
You should ask the builder.
http://www.redlineoil.com/products_motoroil.asp?categoryID=2