Help With Block Casting Numbers

[staticattic]

Allegedly, the engine in my 1986 GMC Sierra is a big block 454 that came from a 1986-ish motorhome. I am trying to verify, but I am having trouble with the casting numbers. The engine is still inside my truck, so I am doing some amazing contortion maneuvers to locate them. So far, the only thing I can find that is close is 14087481. When I googled that and visited some engine lab websites, I found numbers that were close, but not right. Plenty of 140xxxxx numbers, but no 1408xxxx numbers in the big block list. Can someone please give me a shove in the right direction? The number provided was stamped just in front of the distributor.

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[staticattic]

I also found this. This number is on the bottom, just above the oil filter and close to the transmission bell housing.

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[bucket]

That 1408 number is just for the intake manifold. The block casting number, and usually a date code, can be found on top of the bellhousing area.

 

[TubeTruck]

Look behind the driver's side head. There is a small ledge that has the casting number. You might need some degreaser and a long handled brush to clean it off.

 

[AuroraGirl]

Look behind the driver's side head. There is a small ledge that has the casting number. You might need some degreaser and a long handled brush to clean it off.

id like to add to make sure this is on the trans/flywheel side of the engine, not the accessory. behind implies it but id be the dumb one looking behind ps pump

 

[Wumbo]

14015445 454 block.

Could be 2 bolt, could be 4 bolt. You never know until you get in there and look.

Probably has peanut port heads, if it's a mid 80's engine.

 

[bucket]

14015445 454 block.

Could be 2 bolt, could be 4 bolt. You never know until you get in there and look.

Probably has peanut port heads, if it's a mid 80's engine.

Ah yes. The 445 number is probably a good indicator of that huh?

 

[AuroraGirl]

Ah yes. The 445 number is probably a good indicator of that huh?

Ah yes this 454 is made of 454