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Camshaft Check 1800 1970

Camshaft: It is very likely that your cam is "single pattern" meaning that that the intake & exhaust have the same profile. After you run through the adjustment, rotate around until either 1 or 4 are visually at 'equal overlap', meaning both valves are open an equal amount. A 'blueprinted' engine would have the cam degreed in to around 4° advanced, so you should see that at the crank pulley close to the 5° BTDC mark. If it's got 8 full lobes & timed somewhere between 0° to 5° BTDC, then it will do. Look at both 1 & 4.

'Visually': If your engine was properly built to 'as new' & 'blue printed' condition, all the retainers will be at the same height, you can see this if you take the rocker arms off & stick a straight edge across them. If you assume this is correct, then a short straight edge across the pair of spring retainers for one cylinder will give you a good idea.

A Better Method: Set the crank to TDC 1 & 4, which ever one is in the overlap position, loosen the tappet adjustment to zero, rotate 360° & stick in enough feeler gauges to fill the gap & tally that number up. Repeat on the opposite cylinder.

Ideally, when checked at TDC, you should have .020 HIGHER lift on the inlet than the exhaust. ('Straight Up' with a single pattern cam means both valves have the same lift at TDC on overlap)

Best Method: Degree Wheel & Dial Indicator, this will tell us what cam you actually have in it.






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New PCV? [1800][1970]
posted by  Dave B subscriber  on Wed Apr 7 17:47 CST 2021 >


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