This started in the 1979 model year...all stock cast crank slant sixes in 1979-1980 will have that 'stepped' bolt (there was supposedly a small test run of 1978 hydro lifter slants, and I think this bolt design was the result of that small run of engines).

Personally I'd run the solid cam and be done with it, about the time you need to check/adjust the lash, you'll need to change the oil anyway...

When you pass the bucket my way...go light on the butter!



-D.Idiot

The lifters don't get fed from the top do they?

Yep Charlie I just wanted to keep an eye on this thread

Thanks Reed

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

They do. Oil goes up through the rocker shaft, through the rockers and down the pushrods into the lifters. There is no oil galley for the lifters in a slant. Slant six history as printed in the Slant 6 News stated that the extra drilling stations needed for such a galley were seemed too expensive. It would have been pretty cheap and easy to change the block casting, but not to finish the galley.

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Joshua

None of these parts have what I would call a "positive" seal between them, which leads me to think that not much oil pressure is necessary to pump up the lifters. I think shaving the rear bolt but using the hydraulic rocker assembly will work.

But wait a minute, if the stepped bolt appeared in 78-79, that's pre-hydraulic lifters. Does that mean the the hydraulic lifters and the stepped bolt are not linked? If so, then all you need is the hydraulic rockers and rocker arm and you are set.

Right? :shrug: