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Old 04-19-2005, 11:58 PM
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366 chevy big block

i ended up with a 366 big block for helping a friend ........... he thought he was giving me a 396 but after a little research i found it to be a 366 motor (1978 big truck) with a less than 4" bore and tiny valves it looks like a boat anchor to me!
i have a 454 for my pro street 68 truck that i plan on getting some merlin heads for, can i put the stock 454 heads(w/206 int valves) on the 366? bore it out to 427 maybe? is it even worth the trouble of having this odd ball machined? has any one done anything with a 366. i hear its a small bore with the same stroke as a 427 is that right? ive googled the 366 and come up with mostly nothing, nothing of interest other than it was in dump trucks c30-c50?? any experienced info would be appreciated!!!!!!!!

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Old 04-20-2005, 05:26 AM
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Great motor for trucks and buses and that's about it but don't scrap it some farmer would be happy to have a spare core for his grain truck or if you need a good motor for your tow rig.
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Old 04-20-2005, 05:43 AM
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As far as i know all the 366 were tall deck blocks.... So you will have some issues with header fitment, finding a intake, or needing spacers, a distributor with a slip collar....

The good thing is that all the 366 had steel cranks, and they are the same stroke as the 396,402,427.....

All-in-all not the best foundation for a performance engine...

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Old 04-24-2005, 12:47 AM
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well i told my friend what it really is and i got $50 instead of that hunk o'iron anyone want it? $50 and its yours! (in OKLAHOMA) i was really hoping it really was a 396 w/big valve heads for my rod but i guess it was to good to be true. i cant seem to find a set of 454,219/188 heads i guess ill have to either go through junk yards searching head casting #s or save my dough for a few months for the merlin heads!
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Old 04-24-2005, 05:29 PM
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I'd keep the crank and rods, I think the truck rods are heavy duty and of course the crank is steel, balance factor mite work out pretty close comparing standard deck 427 pistons with the old 366ers All you need is a 2 or 4 bolt 454 block and youve got a project
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