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Originally Posted by 427SnakeSC
Not 100% sure of this, but wasn't it the L88 that was advertised as 430 hp and the tri power was 435 hp. I think I remember the L88 was a $1000. option the the 435 hp tri power was much less $. That is why so few Corvettes came with the L88. I think I remember the ZL1 being rated at 550 hp. Again, not 100% sure of these numbers, but I could do some digging in my books! 
Just looked up the '69 L88 and it was advertised as 430 hp.  I have an old Muscle car mag, where they run the ultimate shootout between a '66 427 Cobra and a '69 L88 Corvette. Interesting read! |
The tri-power 435 hp engine was the L71 which the same engine as the
L72 save for the manifold and carb setup. These were all cast iron engines
with 11:1 compression. The L88 had closed chamber aluminum heads with 12.5:1 compression through most of its production life, in latter half of
1969, they switched to an open chamber head with 12:1 compression.
The L89 was basically an L71 with aluminum heads and 11:1 compression
and had the same hp rating as its all cast-iron sibling.
....Fred