I found some numbers on my 454 block.

[Magoo36]

Hello all,

I looked yesterday and found the numbers on my block. Some of them were kinda hard to read but here goes. On the driver's side rear deck above the bell housing it has l40l5445. In the middle of the deck GM 3P CFD. On the passenger side rear deck FO99 or F099. Driver's side head on rear SRE SL and passenger side rear of head H2A98220. Hopefully someone here will know what these numbers mean. I was told it is an LS7 but it isn't cause a magnet sticks to the heads so they are not aluminum. I am hoping maybe it is an LS6. Thank you in advance.

[Duane HTP]

14015445...454.......78-90...2 or 4 bolt
Here's a start.
Contact Fonz69, he's good with these numbers.
Duane HTP

[Fonz69]

Duane is right on the 454

F099 is a date code

H2A98220 is the vin code from the vehicle it came out of

If you pull a valve cover there should be more numbers on the top of the head. Post them up and I can help you figure out what type of heads you have:thumbsup:

[Duane HTP]

You might find this interesting.
http://www.yearone.com/updatedsinglepages/Id_info/gm_engine_id/engineinfo6.html

[Magoo36]

Duane is right on the 454

F099 is a date code

H2A98220 is the vin code from the vehicle it came out of

If you pull a valve cover there should be more numbers on the top of the head. Post them up and I can help you figure out what type of heads you have:thumbsup:

Do you know if I have a 2 or 4 bolt main? And from the date code the date of the engine?

[Fonz69]

only way to really know is to pull the pan:thumbsup:

Would say June 9th 1979 or 89

Really need those numbers on the heads under the valve covers to help:cool:

[Duane HTP]

There should be a number on the cylinder head surface of the block right in front of the right cylinder head. That's the number needed.

[Raceman]

LS7's didn't have aluminum heads................ cast iron, open chamber, rectangular port ONLY.

Everybody that's got a 454 wants to call it an LS7 for some reason. Since they were never factory installed in a car (available only as crate motors) there were some variations in casting numbers unlike other high perf 427's and 454's. An LS7 had 12:1 compresssion and a fairly radical solid lifter camshaft....... about .600 lift, can't remember the other numbers even though I've got 3 or 4 of 'em.

An LS7 in it's pure form wouldn't make a good boat motor. The compression would make it race gas only, and the camshaft's solid lifters and high RPM powerband would mean a relatively short life if pitched/geared to operate within it.

On the earlier 396/427/454's that came with 4 bolt mains there's an EASY WAY to tell without pulling the pan. The bosses above the oil filter were drilled for an external oil cooler and had 1/2" and 3/4" NPT holes, usually with plumbing plugs with square heads. Some were equiped with an adapter on the rear one reducing it from the 3/4" to 1/8" for an oil pressure line. On the low perf blocks the bosses were the same, but had 3/8" NPT threads as the larger one and the second one was usually not drilled all the way through. On later blocks, sometimes in the '80s, such as the ones that came in 3500 trucks and some Suburbans, the blocks could be 4 bolt, but NOT drilled with the larger holes.


There should be a number on the cylinder head surface of the block right in front of the right cylinder head. That's the number needed.

That's not necessarily true. The early style blocks did have a pad in front of the R cyl head, but it's not positioned there on the later 454 blocks. The information contained on the earlier ones is only useful if it was factory installed in a car. If it came across the parts counter as a bare block, a shortblock or long block the information may ONLY be an assembly date and a numerical number, frequently preceeded by the letters CE, which is commonly referred to as "counter exchange" or an over the counter engine.

[RLP]

LS7's didn't have aluminum heads................ cast iron, open chamber, rectangular port ONLY.

Everybody that's got a 454 wants to call it an LS7 for some reason. Since they were never factory installed in a car (available only as crate motors) there were some variations in casting numbers unlike other high perf 427's and 454's. An LS7 had 12:1 compresssion and a fairly radical solid lifter camshaft....... about .600 lift, can't remember the other numbers even though I've got 3 or 4 of 'em.

An LS7 in it's pure form wouldn't make a good boat motor. The compression would make it race gas only, and the camshaft's solid lifters and high RPM powerband would mean a relatively short life if pitched/geared to operate within it.

On the earlier 396/427/454's that came with 4 bolt mains there's an EASY WAY to tell without pulling the pan. The bosses above the oil filter were drilled for an external oil cooler and had 1/2" and 3/4" NPT holes, usually with plumbing plugs with square heads. Some were equiped with an adapter on the rear one reducing it from the 3/4" to 1/8" for an oil pressure line. On the low perf blocks the bosses were the same, but had 3/8" NPT threads as the larger one and the second one was usually not drilled all the way through. On later blocks, sometimes in the '80s, such as the ones that came in 3500 trucks and some Suburbans, the blocks could be 4 bolt, but NOT drilled with the larger holes.



That's not necessarily true. The early style blocks did have a pad in front of the R cyl head, but it's not positioned there on the later 454 blocks. The information contained on the earlier ones is only useful if it was factory installed in a car. If it came across the parts counter as a bare block, a shortblock or long block the information may ONLY be an assembly date and a numerical number, frequently preceeded by the letters CE, which is commonly referred to as "counter exchange" or an over the counter engine.


got one like this 3963512 L 6/ 9
4 bolt w/the big plugs by oil filter
has the CE on it

[Fonz69]

got one like this 3963512 L 6/ 9
4 bolt w/the big plugs by oil filter
has the CE on it

If you want to sell that one let me know:thumbsup:

[Duane HTP]

The information contained on the earlier ones is only useful if it was factory installed in a car.

I agree with you on that. I was thinking in terms of putting together a numbered car. Counter engines would be different.

Duane HTP

[Wild Hair]

MorTec only calls it a 454, 78-90, 2 or 4 bolt main

#14015445

[Wild Hair]

LOL, Did'nt see it in post #2 what can I say It was a long day

Thanks Duane :D :cheers: