A fresh '65 L-76 is on the road and tested on a chassis dyno - .020" over, 330 CID, massaged OE heads and LT-1 cam with Crower Sportsman rods for durability. External appearance is completely original with broach marks, ID stamping, heads, manifolds, carb, etc. all completely intact.
Eighty percent torque bandwidth is 2100-6750; 90 percent is 2450-6100 - both about the same as the new LS7.
The optimum power sweet spot from 5500-7050, which is the range governed by gear spacing shifting at 7050, is nearly constant.
It doesn't get any better than this on a modern engine, and this L-76 is 40 years old!
The owner reports power feels like it's beginning to fall at 7200, and I'm trying to convince him to limit it to 7050. By 7200 the inlet Mach index indicates the heads are choking, and I think a little false valve motion is beginning. Valve springs are GM 3911068.
Details and analysis along with chassis dyno tests from three other 327s and one 350 in a variety of configurations - L-79 cams, aftermarket roller cam, OE 461 heads, Chevy Bow Tie heads, AFR heads, headers, OE and aftermarket inlet manifolds - are here:
http://forums.corvetteforum.com/show....php?t=1444006
The results are enlightening and thoroughly reading all the data and analysis is worth one credit hour toward your MS in Engine System Engineering.
Duke
Eighty percent torque bandwidth is 2100-6750; 90 percent is 2450-6100 - both about the same as the new LS7.
The optimum power sweet spot from 5500-7050, which is the range governed by gear spacing shifting at 7050, is nearly constant.
It doesn't get any better than this on a modern engine, and this L-76 is 40 years old!
The owner reports power feels like it's beginning to fall at 7200, and I'm trying to convince him to limit it to 7050. By 7200 the inlet Mach index indicates the heads are choking, and I think a little false valve motion is beginning. Valve springs are GM 3911068.
Details and analysis along with chassis dyno tests from three other 327s and one 350 in a variety of configurations - L-79 cams, aftermarket roller cam, OE 461 heads, Chevy Bow Tie heads, AFR heads, headers, OE and aftermarket inlet manifolds - are here:
http://forums.corvetteforum.com/show....php?t=1444006
The results are enlightening and thoroughly reading all the data and analysis is worth one credit hour toward your MS in Engine System Engineering.
Duke