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Username Post: L72 hydraulic roller cam replacement        (Topic#349631)
Platinum Supporting Member
Posts: 74
Loc: Gardnerville NV
Reg: 03-21-14
02-12-18 09:01 PM - Post#2724210    

Tall order here, I have a complete 1965 l78 (air cleaner to exhaust manifold oil pan) and plan on boring it out to 427 specs. In effect making roughly l72 specs. (Yes it is a 962 block and will be sonic tested.) Got a smoking deal on what is probably the only rolling l78 IE code chassis/drivetrain radiator and shroud that someone stored for years.

It is going in a 1965 Impala, M21, 3.73 posi rear.

I am am at a crossroads, I want a hydraulic roller cam in it. I want to run power disc brakes.

Option 1 - 11:1 factory type pistons (good for the rectangle ports, more rpm with more duration,) Is this possible with power brakes?

Option 2 - 10:1 pistons (less duration, less than optimal for the rectangle ports, better for power brakes)

Option 3 - Sell the 962 block, Buy a Dart big M block, build a 509 with the 208 heads at 9.6:1 and slap the zz502 cam in it. Dress with l78 parts, enjoy the cubes, the power brakes and live with the choked down l78 exhaust manifolds.

Option 4 - Solid lifter factory cam and enjoy the engine for what it is.

What cams would you all recommend for option 1 and 2?
How many would go option 3 and 4?
I am concerned about gas quality and detonation.

Thanks in advance for your input.

Edited by chip8541 on 02-12-18 09:05 PM. Reason for edit: No reason given.


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