This"Street/Strip" engineis simply a toned down race engine with a little less compression and camshaft. Ships In a Few Days. May 22, 2023 ( 4 ), Main Bearings, H Series, 1/2 Groove, .001 in Thinner Size, Tri Metal, Ford, 351M, 400, Set of 5, Estimated USA Ship Date: Mazda crankshaft kits - RPM google_ad_height = 250; Critical rod dimensions are are held to very precise tolerances of +/- .0001 of an inch, which is the tightest tolerance you will find in the performance and racing aftermarket. FORD - Crank Kits - Clegg Engine Estimated International Ship Date: