what engine do i have?

[texasredneck]

hi,
i drive a 1980 gmc sierra grande.i know the truck originally had a 350 diesel engine.i am the third owner of the truck and someone before me changed the diesel engine to a gas engine.i don't know which engine i have, is it a 5000L or a 5700L, a 305ci or a 350ci?
i know i have to find the engine number to learn more about my engine, i know for a V8 i have to look somewhere close to a valve cover to find the engine number.the engine is now out of the truck because i am restorating the vehicle.i stand before the engine and i see the waterpump, left on top of the engine, i see the alternator and behind that is the original left valve cover.between the valvecover and the alternator i see numbers stamped around where the gasket of the valve cover is. that number is: 95B570300 is this the number i need to learn more about the engine ? can someone tell me where i can find the explanation of that number?it would be a great helpfor me to know what parts i need to buy for the engine.
thank you !
kurt

[77chevyman]

If you look on the back of the block all your numbers are back there. The lip behind the head were the bell housing bolts up to the motor. It will have what u need then go to motech.com put ur numbers in it will tell u what it is. It should have a stamp if it is 5.0 or 5.7. I hope I could be a help.

[texasredneck]

hi, thanx for the link to the site, i typed in motech.com but i don't find the website....

[Pontiac1976]

www.mortec.com is what it called. The # will be on the back of the block driver side right blow the valve cover. & Mortech will tell you the numbers. sorry I did mess that up did not notice I put the h on the tec part. fixed now

[77chevyman]

Sorry. I made a typo

[texasredneck]

hi guys, thanks for the links , i found it , it is WWW.MORTEC.COM

[texasredneck]

hi guys,
i have cleaned my engine(V8,gas) and it is out of the truck , i have found the block casting # and date and the engine assembly date/suffix code.
i have checked the mortec website to know more about my engine but i have still doubts...
if anyone should feel like it, please check out my id numbers and tell me more about my engine , i would appreciate it a lot.
small detail, my engine is red colored
here goes:

-block casting #: 3970010
-block casting date: 5 E 30
-engine assembly/suffix code: K 06 02 CMJ
and there was another number close to the assembly/suffix code :
95B570300(i think this is the partial vin code)

if you like finding out about the numbers i have another (V8gas)engine from a friend, this one is blue colored.

-block casting #: 14010203
-block casting date: 0 E 13
-engine assembly date/suffix code: K 08 22 D6C
and there was another number close to the assembly/suffix code :
7B7705054(i think this is the partial vin code)

please let me know more about my engines if you have something, i wouldappreciate it a lot,
thank you very much!
kurt