Re: Bearing clearance
On just about every Flattie we build we aim for .002"/.0025" on both the rods and mains! We consider this "ideal" for most street/strip applications.
One area we always check first are the main bore sizes AND the rod bore sizes. These numbers will have an effect on your actual clearances. If any of these holes are "out-of-spec" they need to addressed first, before attempting any bearing clearance checks!
The ride in my signature now has (I believe) over 40,000 miles on it and hasn't had a single issue to date. This unit has over 150 HP and over 260# Torque!
Read the P.S. below here, it is important when a crank needs grinding? We will NOT grind any cranks here that aren't included in an ongoing build UNLESS the customer gives us an accurate number, both rods AND mains.
Thanks, Gary in N.Y.
P.S. The one advantage you WILL have grinding the crank to any undersizes over using all new components, is you will be able to pre-measure the rod/main bearings in their respective locations THEN grind the desired clearances directly into the crank. Doesn't get any more accurate when done this way. It does take a very experienced grinder to get the sizes you need.
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