LM7 is the most common. That would be the version found in '99-'07 trucks, large variety of SUVs, ect ect. This is probably the cheapest one. But you need to watch out for the 706 Castech heads on those motors. Depending on what you want to do with the heads that may or may not be a concern to you.
L59 is the flex fuel version of the LM7.
L33 is Alu block version found in some '05-07' trucks. It also has the 799 heads.
After that we get into the slightly more expensive versions -
LY5 truck
LMG is flex fuel version of LY5
Then the less common version LH6, LH8, LC9
But it really depends on your plans. If you want a strong high HP motor that you don't plan on messing with then spend the extra coin and find the LY5 and do the active fuel management delete on it.
If you plan on stripping the motor and doing some head work - then get the garden variety LM7. Find some 243 or 799 heads and get head work done. Slap in a monster cam. Reuse stock bottom. AND ROLL IT.
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'69 Chevelle Malibu LSX370, 4L80E, Brembos, hydroboost, 12 bolt, c/os, etc.
You can call me Bart
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