THE SHOP

October '17

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6 PRECISION ENGINE OCTOBER 2017 PRECISION ENGINE gpm, which is more than adequate for this puppy. The aluminum-bodied pump weighs 7 pounds, and features include a stainless steel main shaft and ceramic seal. Clearance between the pump and the COMP timing cover is spacious, with no need to modify anything for clearance. Amperage draw is 11 to 12 amps. As far as color is concerned, I initially thought of going with black, but decided on blue just to spice things up. WATER TEMP SENSOR LS heads feature a 12mm x 1.5 threaded hole (left side front) designed to accept the LS water temperature sensor. Since we're not running an engine controller, I installed an adapter to the left cylinder head's temperature sensor hole to allow the use of a conventional small-block Chevy temp sender. The adapter features a male thread of 12mm x 1.5 that fits the existing threaded hole in the head (with sealing washer), and a female 3/8-inch NPT hole to accept a SBC sender. I used an adapter from ICT Billet P/N 551179. This accepts a SBC sender that has a 0.850-inch-length probe. The right-side head's water port was simply sealed with a 12mm x 1.5 x 20mm bolt along with a sealing crush washer. The temp sender is a Stewart-Warner P/N 334P-D. Note: If you plan to use the aluminum ICT adapter, be sure to apply a bit of lube to the adapter's male threads. Installing the adapter dry into the aluminum head can easily result in thread galling. CRANK BALANCER Our Fluidampr 720101 balancer features a 7.250-inch diameter, overall depth of 2.335 inches, and a bore diameter of 1.2460 inches. On our crank snout diameter of 1.2475 inches, this provided 0.0015-inch press fit to the crank snout. The damper was first heated in a con- vection oven to 220 degrees. A coating of high-temp anti-seize was then applied to the bore and exposed crank snout. Using a bearing-assisted threaded-mandrel installa- tion tool, the damper was smoothly drawn fully into place to seat against the crank gear. The 7/16-20 ARP crank bolt was treated to ARP Ultra lube and torqued to ARP's spec of 80 foot-pounds. The Fluidampr was already conveniently laser-etched with degree marks. With number 1 piston at TDC on compression stroke, a timing pointer supplied with the COMP timing cover kit was adjusted to indicate zero on the damper. Note: I always take the time to verify crank bolt fit prior to final bolt installation, to make sure the bolt does not bottom- out inside the crank snout female threads. Once the damper has been drawn fully into place, mated against the crank gear, I hand- install the bolt without its washer. If the underside of the bolt head meets the face of the damper, I know that it won't bottom out when installed with the thick washer. COOLANT PLUMBING The World Products Motown II LS block came in two versions: the early-release ver- sion that allows external coolant plumbing Motown II LS Build Part 4 THE DYNO SESSION May 17, 2017. Ross Racing Engines, SuperFlow dyno, Niles, Ohio RPM LB-FT TORQUE HP 3600........................................................... 500.6 .........................................................345.4 3700........................................................... 501 ...............................................................355 3800........................................................... 501.9 .........................................................372.6 3900........................................................... 503.5 .........................................................390.5 4000........................................................... 510.8 .........................................................410.4 4100........................................................... 523.6 .........................................................427.1 4200........................................................... 534.9 .........................................................441.1 4300........................................................... 539.4 ............................................................466 4400........................................................... 543 ............................................................483.5 4500........................................................... 549.3 .........................................................496.4 4600........................................................... 553.8 .........................................................514.5 4700........................................................... 554.2 .........................................................527.7 4800........................................................... 554.9 .........................................................538.8 4900........................................................... 555 ............................................................549.9 5000........................................................... 555.5 .........................................................559.6 5100........................................................... 555.6 .........................................................573.8 5200........................................................... 555.7 .........................................................589.9 5300........................................................... 553 ............................................................599.8 5400........................................................... 549.6 .........................................................600.2 5500........................................................... 547.8 .........................................................606.5 5600........................................................... 545.4 .........................................................610.3 5700........................................................... 542 ...............................................................613 5800........................................................... 539.1 .........................................................614.8 5900........................................................... 538.7 .........................................................619.4 6000........................................................... 529.8 .........................................................623.4 6100........................................................... 525.1 .........................................................626.7 6200........................................................... 520.7 ............................................................630 6300........................................................... 515.9 ............................................................641 6400........................................................... 510.4 ............................................................637 6500........................................................... 503 ............................................................634.5 6600........................................................... 489.5 .........................................................629.5 6700........................................................... 479.3 .........................................................625.7 6800........................................................... 472.2 ............................................................622 Prior to the dyno trip, we pre-oiled the engine with 5W-30 oil, using our Goodson EPL-120 oil pressure tank, and verified oil flow to all rockers.

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