working on my 80 chevy k30 with a big block transplant of unknown parentage, the water pump is off, its number indicates 'special high performance' but the engine number doesnt, the number stamped on the machined tab on the passengers side front of the block is; H12821707, its clear as a bell, no "I" before the h, or a "p" or "D" after it, indicating something special, i cant find the H plain anywhere in the last 2 hours of searching the internet, can anybody id this engine? ikt would be nice to know what the truck actually has in there
- Thread starter ericlb
- Start date
"12821707" looks like a GM parts # or assembly number, but, as you say it doesn't readily pop up on the 'net.
It doesn't look like a typical GM engine serial number.
My son is parts manager at a GM dealership, and loves this stuff, I will see if he can find out anything tomorrow and post back.
For now, see if you can find the CASTING numbers and date codes on the heads and block and go to the Mortec site, you should be able to narrow down what you have.
LOTS of good info at that site.
It doesn't look like a typical GM engine serial number.
My son is parts manager at a GM dealership, and loves this stuff, I will see if he can find out anything tomorrow and post back.
For now, see if you can find the CASTING numbers and date codes on the heads and block and go to the Mortec site, you should be able to narrow down what you have.
LOTS of good info at that site.
DoubleO7
Well-known Member
- Location
- Crystal River, FL
Stamped numbers on the machined space above water pump on passenger side can identify the engine.
But that area is also often used for the partial vin number of the vehicle it was originally installed into.
Might want to see if those numbers match a portion of your vin.
Did you remove valve cover to maybe reveal another set of stamped numbers?
But that area is also often used for the partial vin number of the vehicle it was originally installed into.
Might want to see if those numbers match a portion of your vin.
Did you remove valve cover to maybe reveal another set of stamped numbers?
Those numbers are usually part of the vin from original vehicle. You need the casting number off the bellhousing flange on the left (drivers side). And you may actually now know if it's a special "hi-perf" block un-till you remove the intake and see if it's stamped into the lifter valley some where. Almost all 402, 427,454,502 blocks that I have seen have had that cast into the valley Regaurdless of application. 396 blocks a were cast with and without "hi-perf". Your cylinder heads may also have that marking as well. Once you get the casting number check out the mor-tec website. Lots of good info as someone else pointed out.
the numbers wont match this truck, acording to the original window sticker the truck was born with a 350, about the 2nd year, 1982, the owner, a friend of mine installed a oilfield bed with pto winch and poles on it, he thought it needed more power, one of his friends, a car guy with numerous spare engines, picked out a big block for him from his stash that was "fresh" this engine appears to have been a light green blue at one time, but from those 2 ive heard its everything from a 454, to a 396, to a 427 out of a 1970 corvette , for my purposes since i intend to keep the low mileage truck it would be good to know what the thing is in case i do need to tear into it someday. it does pull a load real well for a gas engine, but some of that is the 4;56 axle ratios
If the engine is blue it was built '77 or later if the color is original. Making it past the point of anything special, just a weezer hum drum 454. Big torque off the line, but past 15mph you need a 350 that can wind up to make a big truck move. 454 will have a cut out in the balancer. The HI PERF markings don't mean much, I took heads with those markings off an original 366 in a school bus.
timcasbolt
Well-known Member
I had a 396 hiperf block. It was a 265 hp, 9:1 two barrel engine from a 69 station wagon.
I agree that if op's engine is painted corporate blue, it's probably a 454 from the late 70's/early 80's. The hp versions were usually painted black.
I agree that if op's engine is painted corporate blue, it's probably a 454 from the late 70's/early 80's. The hp versions were usually painted black.
I'm sure you already looked at the number pad real good but there should have been 2 sets of numbers. I'm not sure what the number you found means, maybe a replacement engine. I would go after the casting number, located on the drivers side below the cylinder head right where the transmission mounts to the block.
A lot of people get confused when they see "hi perf" or anything related to "performance". This is very common and doesn't mean anything. Without decoding more (important) numbers and/or looking at some subtle differences of engines/displacement it could be any big block at this point.
A lot of people get confused when they see "hi perf" or anything related to "performance". This is very common and doesn't mean anything. Without decoding more (important) numbers and/or looking at some subtle differences of engines/displacement it could be any big block at this point.
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