Help with casting numbers please

[nick l]

Hi guys Im new here but anyway I picked up a lower mileage 506 engine the numbers on the pass. side bell say H087. With that number would that be a early GEP block? I havnt found any diamonds shapes on it

 

[Will L.]

"H" is 2001 when gep started, but GM was still producing. It could be either one if thats the case. Can you post pictures or the valley area- behind the injector pump? Also a pic of the side of the block showing engine mount/ freeze plug area?

H= 2001. 08 7 August 7th- Tuesday.

http://www.thetruckstop.us/forum/threads/late-6-5-date-codes.28056/

 

[THEFERMANATOR]

For some reason, that h087 sounds like the chinese casting number. The chinese copied a late GM block when they made there early ones right down to the date code.

 

[floyd400]

Or is it August 8, 97? GM's 506 block started around 96/97 I think.

 

[Burning oil]

Also a pic of the side of the block showing engine mount/ freeze plug area?

Is that because of the extra mounting boss? Whats that for anyway?

 

[Will L.]

Is that because of the extra mounting boss? Whats that for anyway?

Yes. As a just in case we cant see the endless roads logo because of suff in the way- then again does the chinese block have it also...?

 

[Burning oil]

What was that boss for?

 

[Husker6.5]

What any boss is good for - not much of anything!

Here's to the New Boss, same as the Old Boss!

 

[Will L.]

I wonder if the g503 guys would know. I'm thinking there was a mounting change in the Hmmwv that it was done for. I read a single sentence that explained it a long time ago. Guess I slept too much since then.

 

[THEFERMANATOR]

Hummers use different mounts than the trucks, thats the reason for the extra boss I believe.

 

[Will L.]

Mine uses the same as truck mounts. Hummers/ hmmwvs did not have a change when gep started making them, thats when the extra boss was added. Ive helped 2 guys put junkyard 6.5 engines into hummers. Also when my regular gm block came out and optimizer went in, it didnt change anything on how it was mounted.
I was thinking they might have changed it when the changed hmmwvs to the 3 piece or flat radiator design, maybe they moved the engine and trans a bit.

 

[Husker6.5]

P30 chassis, perhaps? Or maybe marine applications?