how much(junkyard cadillac)??

[cadpowered]

69 Longhorn, yes the 500 was through 1976, the 425 was available 1977-1979. The 1976 was available with EFI.

Also one should note the Horsepower rating System was changed from gross to net in 1972. This is the reason for the charts lower power Ratings. The only real loss of power came from the lowering of compression in 1970. Even that wasn't much the 500s compression for example was lowered from 10.0:1 to 8.5:1 The result was a loss about 35 hp and 15 ft pounds of torque. So don't let the lower stated ratings fool you the engine in the later models is the same engine!!

The large chamber 120 cc heads are the better choice for low end torque and performance. These heads will produce more torque in the 1000-4000 RPM range than the 76 cc heads. When building a low end grunt engine the 120 cc head would be your best choice.

What's the difference between a 472" and a 500" ?
A: Just the crankshaft and the pistons. The 500" has a 4.300" stroke, while the 472" is 4.060". The compression height (the distance between wristpin centerline and the piston top) is about .110" higher on a 472".

Anybody want to suggest what it is going to cost to get a Chevy big block or small block to perform at these levels? Don't take me wrong I love my Chevy small blocks, I use them in my Jeeps and my stock SWB trucks.