Thread: Got a 478...
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Old September 24th, 2022, 09:48 PM
Prowbar Prowbar is offline
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
Posts: 386
Rep Power: 183
Prowbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the rough
Default Re: Got a 478...

Finished the flywheel today, ground the flywheel flat for the last time, made the conversion sleeve for the pilot bearing and pressed it in, and installed the starter gear from the spare 305 flywheel. There are some surface cracks but nothing cracked through, I'll be running it this way we'll see how it goes. Thinking it'll have plenty of life left.

Now onto the cylinder heads. Going to have to modify and install exhaust valve guides. I found valve guides from a Volvo Penta engine that will be usable for my conversion. These guides will be modified to accept good valve stem seals.

A 3 angle valve job is also on the list.

I'm also looking into a modification on the idler gear that will allow me to run the gear setup with the 305 timing cover, this will involve some machine work also. Some say it cannot be done but I'm not a believer yet...
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