October '17

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42 THE SHOP OCTOBER 2017 SHOP TOOLS & EQUIPMENT and cam position sensor. Also make sure that your harness has the correct connector for the cam sensor, as the designs vary among different genera- tions of LS engines. • Your camshaft specifications card. The dyno operator will want to know your cam specs. • All engine specifications, including bore diameter, crankshaft stroke, com- pression ratio, type of lifters (solid or hydraulic, flat tappet or roller), if rocker arms are adjustable, etc. This allows the dyno operator to know what he's dealing with and create accurate records of the dyno session. • If external oil plumbing is required (for a remote-mount oil filter, for example), remember to bring the appropriate hoses, fittings and filter adapter. Prepping Your Engine for the Dyno EXHAUST HEADERS One thing to verify before the appoint- ment is to make sure the shop has exhaust headers that are correct for your engine. Don't bring your own headers unless abso- lutely necessary. The dyno shop should have headers that are pre-fitted with air/fuel ratio sensors, which allow the dyno computer to mon- itor this aspect. Also, most use long-tube headers to better accommodate the dyno room's exhaust ducting. Make sure you check beforehand, as some dyno shops may specialize in certain brand formats (Chevy, Ford, etc.) and may only have headers on hand for their needs. If you must supply your own headers, it's best to provide used headers, or new headers that have not been treated to chrome plating or other specialty coat- ings. Using brand-new, chrome-plated or specialty-coated headers is a bad idea, as the initial running and related heat may potentially discolor the tubes. PRE-OILING Any fresh engine must be pre-oiled before firing. This ensures that oil delivery has been established through all oil passages and to all bearings, lifters, rockers, etc. Connect the pressure canister's hose to an oil port on the block. Pre-oil tanks include a variety of adapters to accom- modate thread port sizes. If you're running an LS engine with individual coil packs, make sure that you supply the coil harness. The coil harness is a separate wiring harness from the ignition controller harness.

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