• Block

• Rods

• Pistons

• Crankshaft

• Support equipment

• General Information

Block:    The new R302 block was decked, align-honed and bored to 4.030".  With a block this stout, we no longer felt the need to use a reinforcement girdle.  The cam bearings are specific Motorsport units made for the R302 block and carry part number M-6261-R351.  The timing belt assembly is from Danny Bee.

[ Top of Page ]

Rods :  The rods are custom made Crower Maxi-Light units; part number ML94900B-3.  They are 5.6" long and weigh 520 grams each.  This length was chosen to maximize the rod-to-stroke ratio (currently 1.8667:1 versus 1.73:1 stock) while still maintaining reasonable piston dimensions within the 8.2" R302 block deck height.  The rods, as delivered from Crower, were in excellent condition and required no additional machining.  The rod bolts are Crower 3/8" units.  The rod bearings are Clevite CB-634H.  The bearing clearances should be between 0.002 and 0.003 inches and can be estimated with Plastiguage if it's done extremely carefully.

[ Top of Page ]

Pistons:  The pistons are custom domed units made by Ross.  These pistons incorporate gas ports are extremely light weighing only 392 grams each.  The full floating piston pins are Ross 0.866" diameter tapered chrome-moly and weigh 100 grams each.  The pins are retained with double Spiro-Lox at each end of the pin.  The piston rings are Childs & Alberts Zero Gap part number RS-36ZX4.035 and were hand sized to each bore/piston combination.  The pistons were precision cut to allow 0.050" clearance in the valve reliefs.  This is a fairly tight piston-to-valve clearance and requires that each piston/valve combination be checked and fitted by hand.  The +6.5 cc dome volume, - 0.005" piston-to-deck clearance (the piston sticks out of the block) and Fel Pro 1021 head gaskets combine to yield a 14.2:1 static compression ratio.

[ Top of Page ]

Crankshaft:  The crankshaft is a billet steel unit made by Scat.  The 50 lb crankshaft is internally balanced and has gun drilled rod journals. The crank was delivered from Scat almost perfectly balanced and has required only minor modifications to be balanced.  In general, internal balancing is better for high RPM use because of reduced crankshaft harmonic vibrations.  This factor probably contributes to the long lifetime of a stock block in this application.  The stroke is 3.00 inches and the rod and main journals are stock diameter.  The main bearings are Clevite part number MS-590H.  The main bearing clearance should be 0.002 to 0.003 inches and can be measured with Plastiguage if it's done very carefully.

[ Top of Page ]

Support Equipment:

[ Top of Page ]

General Information:  The short block is assembled according to the general guidelines below.

• Rod bolt torque spec:  63 ft-lbs with Crower anti-seize lubricant.

• Main stud torque spec:  70 ft-lbs with oil.