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Re: Need help on determining LS6 motor
291's are the 70' Chevelle ls6 head. The casting block number on the back of the engine on the driver's side should end with the last 3 digits 512. The 70' Chevelle LS6 motor is the true "ls6" that everyone talks about. The rest were lower horsepower ratings. The 512 blocks and 291 heads are what everyone desires. Chevy sold ls6 vettes in 71' with 425 hp. and also sold ls6-ls7 crate motors up until the early 90's before the 502's were introduced. Hope this helps ya out, and sounds like you got a fairly healthy engine regardless. Trevor
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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
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