The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**71blksuper4x4** · 01-06-2011, 10:14 PM

The "real" ls6's have a casting number with the last 3 digits of 512. 512's were used in late 68-70 in 427's and 454's. I believe the 71-72 ls6 blocks are like a 289 block or something close. After that, I can't help you. They made ls6 crate motors until the early to mid 90's. Trevor

01-06-2011, 10:14 PM	#2
71blksuper4x4 SWB 4x4 Collector Join Date: Jun 2001 Location: Osage City, KS Posts: 5,155	Re: Need help on determining LS6 motor The "real" ls6's have a casting number with the last 3 digits of 512. 512's were used in late 68-70 in 427's and 454's. I believe the 71-72 ls6 blocks are like a 289 block or something close. After that, I can't help you. They made ls6 crate motors until the early to mid 90's. Trevor __________________ TREVOR 1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks) 1972 Jimmy (soon to be Hickey cloned) 1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track) 1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank 1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT) http://67-72chevytrucks.com/vboard/s...d.php?t=624819 1989 V3500 Crew Cab (454tbi, NV4500, np205) 1970 Chevelle SS (LS5 454,th400,8track,buckets,tach) :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever