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H1 Hummer Cummins Swapped

LowRam

Active Member
Messages
71
Likes
198
Location
Michigan
Thread starter #103
The tappets are they drilled and /or coated?
Neither. We've looked at using coated tappets, and quite possibly will on the Sand Toys next motor.
We are using the coating on Pistons, Turbo housings, manifolds, and recently a radiator to see if there is a difference.
The coating process itself isn't that difficult, just time consuming. If a person had all the equipment and wanted to do it, they could turn out a very serviceable part.
If you buy everything you need to do it, then getting them coated professionally would be a wash or even cheaper.

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LowRam

Active Member
Messages
71
Likes
198
Location
Michigan
Thread starter #104
So the week that was;
Up to this point we had been using the billet freeze plugs while building our Cummins motors, this build the goal was under 500hp motor, mostly stock, not a lot of frills. Ok, the Nickel plated gear cover was a frill, but it looks good.
Turns out that the gasket set we used came without freeze plugs and the wrong valve stem guides, but the rest of the kit was very complete.
Off to the local auto parts for freeze plugs. The Large plugs were Dorman 555-124 and funny looking.
They don't stay in while running the motor. Turns out the are listed by Dorman as a Cam shaft plug, but both the local stores I called have been selling them as the block expansion plugs because the were 2-9/32".
Snooping around the web, turns up that you need to really use the Cummins plugs because of the odd size.
After having this happen twice. I made up the following plugs that we will be using when not using the billet units that require drilling and tapping the block.

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