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Decode a 454 BBC,,,???
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desertjoe View Drop Down
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Joined: 23 Sep 2013
Location: New mexico
Points: 13681 		Post Options Post Options   Thanks (0) Thanks(0)   Quote desertjoe Quote  Post ReplyReply Direct Link To This Post Topic: Decode a 454 BBC,,,???
    Posted: 16 Jan 2023 at 7:50pm
    I lucked onto a 454 BBC suppossedly to be in good condition. It came out of a mid to late 80's International Bluebird Bus with only 44,500 gentle miles,,,,Wink
 Does anyone know how to decode the engine numbers? The set of numders stamped on a small pad on the front of the right side cylinder head  are 109181 and numbers cast on the bellhousing flange is 10237226. Anyone got a clue? The computor is stamped for a 7.4 litre which is a 454. How does one know if it is a tall deck or regular?  It has a HUGE auto transmission that is almost square,,,any value on the trans?? The fan and water pump arre also HUGE. This whole monstrocity was running and both exhaust manifolds look real clean and grayish and dry with,No sign of oil burrning,,,,
 Any help appreciated,,,,ClapClap
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Michael V (NM) View Drop Down
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Joined: 12 Sep 2009
Location: NM
Points: 2453 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Michael V (NM) Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2023 at 9:35pm
seeing how it was in a big bus ,,, I would make a WAG that the trans is an Allison, built for trucks,,, so that may be a tall deck engine...
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DMiller View Drop Down
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 33295 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2023 at 6:16am
Spoke to local bus mechanic, likely not a 454 but either 366 or 427 tall deck could even be a 496. Processors in the big blocks can be coded 454 but really means nothing. Is just at 1/2” height difference between the blocks yet intakes or distributors will not interchange between them.
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Michael V (NM) View Drop Down
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Joined: 12 Sep 2009
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Points: 2453 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Michael V (NM) Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2023 at 10:37am
I had a "chevy" buddy that tole me that there is hot rod stuff for the "tall" blocks,, jus gotta make sure ya tell them places like Summit or Jegs that is what ya workin on

 
they gots that extra so they have a 4 ring piston instead of a 3 ring piston,,, or so I was told


Edited by Michael V (NM) - 17 Jan 2023 at 10:39am
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21470 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2023 at 10:44am
I'm no Chevy guy, but "truck engines" (not pickups) had the taller block just so they could use a 4-ring piston. Never was a 454 "truck" engine that I am aware of. 366 and 427's. Steel crankshafts, forged pistons, sodium filled/stellite faced exhaust valves, and a double roller chain drives the camshaft on a Ford.
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desertjoe View Drop Down
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Joined: 23 Sep 2013
Location: New mexico
Points: 13681 		Post Options Post Options   Thanks (0) Thanks(0)   Quote desertjoe Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2023 at 12:17am
Originally posted by DrAllis DrAllis wrote:

I'm no Chevy guy, but "truck engines" (not pickups) had the taller block just so they could use a 4-ring piston. Never was a 454 "truck" engine that I am aware of. 366 and 427's. Steel crankshafts, forged pistons, sodium filled/stellite faced exhaust valves, and a double roller chain drives the camshaft on a Ford.

 Well, this is some good news Re: the steel crankshaft and the valves,,,soon as I get the 14 miles of wiring looms off the engine where I can see the spark plugs, I'm gonna run a compression check to see if I have to open it up. My plans are to replace the throttle body and distributor with an aluminum mainifold (for Weight and apperance) and a distributor that will fire the engine WITHOUT a computor.
 The Lady I got the engine from was helping me got the numbers off engine but she missed a few,,,,LOL. Number on pad in front of right cyl head is 10918FYN and number on bellhousing flange is 10237788. Wonder if it is  a 4 bolt block?  I would rather it be a 427 as THAT was always that Magical Hi PO number,,,,,
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DMiller View Drop Down
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Joined: 14 Sep 2009
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Points: 33295 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2023 at 9:34am
A GM dealer Parts Department should be able to ID by Engine number.
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