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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Feb 2010 Posts: 86 Shop Shark | | Shop Shark Joined: Feb 2010 Posts: 86 | I bought a supposed to be a 89 305 out of a van at the auction. Can someone break down the block numbers for me.V1216TWB I need to order parts so I need to make sure what I have. thanks | | | | | Joined: Feb 2010 Posts: 86 Shop Shark | | Shop Shark Joined: Feb 2010 Posts: 86 | I know the V is flint Micigan. The 12 and 16 are dates. But what is the TWB stand for in 1989??? thanks | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | I see nothing with letters for block castings. All info I have shows 8 numerals. Only 89 is for a car with roller cam. Are these numbers/letters from the rear of the block? | | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | I assume the numbers are stamped on a machined pad on the block ahead of the passenger's side cylinder head? The 3-letter suffix should tell you the year and engine size if you can find the right cross-reference chart. "T" in that suffix code means it's a truck engine, but I can't seem to find the reference chart online that I usually use.
The casting number (not a stamping) at the back of the block just above the bellhousing bolt circle on the driver's side is probably a better way to do your research. On older blocks, (1970's) we used to look for the stamped "T" in the suffix to identify a 4-bolt main bearing 350, but it seems that doesn't always work on the later models. Good luck!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2010 Posts: 86 Shop Shark | | Shop Shark Joined: Feb 2010 Posts: 86 | the casting in the back is GM50LG . The other V1216TWB was stamped in front of the cylinders. thanks | | | | | Joined: Mar 2005 Posts: 98 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 98 | TWB 89 305 Truck 175hp L-03 TBI
Last edited by complexvariable; 05/29/2011 2:12 AM.
50 chevy 3100
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