Re: Bearing clearance and oil viscosity?
I have a customer who we did a 565 over 5 yrs ago for his Chevelle. Engine made 965 @ 7000 on the dyno and with some upgrades since then is probably closer to 1K hp. This car is a street car that gets driven almost every weekend as weather allows (he's in Maryland). He's been to the track several times and when he drives it, he drives the snot out of it. It hasn't been babied. He broke an inner valve spring last year and we put valve springs on it but that's all that has been done. Been in the car since new. Rod bearings were set at .0022-.0023 and mains .0027-.0028, standard volume pump with Driven 10-30 oil. I would have no problem with him running a 20wt oil. We will be going through the motor this fall and I'm anxious to see how everything looks.
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