Measured rod bearing crush in my engine with NOS Nascar rods and Clevite CB1512V bearings is 0.01" which is about three times the recommended for a street driven car. It also gives wear marks on the bearings, typical for "excessive crush" in the Clevite information. Crank, rods and bearing clearences are otherwise within nominal specifications. The bearing type is common in high powered dragsters which may require this crush but nothing is said in the specification about the high number.

What is your recommendation for more suitable bearings? Crank tappet radii is 0.125", street driven car with carburetor and low comp. Clevite CB527HND seems to be a common choice but has anyone measured the crush? The brochure just says "maximum crush", not very promising.

" Crush " is typically determined by where you size the rod bores and crank main bores. Every shop will have their own " sweet spot", but typically a shop will size it to the " middle spec". Although you prefer to have maximum crush, and still maintain your desired vertical bearing clearance, it isnt always possible with todays bearings. The amount of bearing clearance can be affected by the min to max crush spec., so some shops also adjust accordingly. After doing hundreds of engines, you come up with a plan that works for certain brand or style bearings. Years ago you could trust most of the bearings for sizing, now, forget it, they are all over the place, and its a pain to deal with You can have 3 different sets of bearings to get one engine right.

A low compression street engine will run fine with a P bearing. Easy to get, wears well, good embeddability. H bearing is fine also, just check the crank to see if it needs the chamfer of a race style bearing.

Also, if you can get them I'd suggest ACL bearings, seem to be the best sizing right now.