Originally Posted by strokin'_tatsch

An '01 engine should have the support in the lifter area, thicker valley walls, a crank that does NOT have lightening holes drilled through the rod journals, and the block should be clearanced for the larger counterweights on the crankshaft that were a result of eliminating the lightening holes in the rod journals. Also, the pistons in an '01 should have the intermediate ring grooves cut deeper (pre Jan '98 were 0.402" and post Jan '98 were 0.435") and use a wider intermediate ring (pre Jan '98 intermediate ring was 0.137" and post Jan '98 intermediate ring was 0.185")..

Originally Posted by fordman67

My y2k is 92310793
The thicker casting was supposed to keep noise down lol yyeeeaaa Ok!

Originally Posted by strokin'_tatsch

FYI, OBS engines aren't really having any problems holding power. The thicker material in the valley area is not going to make or break this build. It will hold just fine unless the tuning gets retarded.. lol