What oil for solid lifters?

I've used Val. racing oil in over 12 of my racing engines. never had any troble with any of them, it is ashless oil and has a none foming agent in it . stops foming if oil hits crank shaft on launch. i also put a bottle of STP Oil treatment in also. why you ask, I gain 10th of a sec. with it in oil. tried many times without it and as soon as I put it in the run i go a 10th faster. the clearance on crank will determin the weight of oil you need. Ask your eng. builder. what he feels you should use. Good Luck Gary I used pennzoil racing oil in one of my motors and turned a bearing on 1st run. this was a 1967 442 that ran on the nhra national record in class . I never used that crap again.