Shell Rotella T (yes diesel oil) and add a zinc additive if you have a flat tappet cam. I got this info from a professional engine builder. That's what he runs in his 700 hp 451 stroker street car (except the zinc additive because he runs a roller cam)
Numbers matching 340/727 car. Both the engine and trans have been recently rebuilt. The engine has MP 474/280 cam and professionally ported 2.02/1.60 J-heads. The body has been sandblasted, epoxy primed, all bad metal replaced, smoothed, primed and sealed. Numerous new parts come with the...
I've joined your group with a heavy heart. A friend of mine suggested this site to advertise my '73 Rallye Challenger. Hopefully it will go to a good home.