327 Question

[RCE1962]

I need help to decode a suffix number. I'm told that the engine I bought over 20 years ago is a 1966 327. The Suffix code is Z1 6638526. I'm assuming that the first two digits represent 1966. 1966 -327 Horsepower ratings according to two web sites, show 325HP and 350Hp @5800 RPM for the "Z1" RPO. Is this also known as an L-79 engine? What should the intake and exhause valve size be for this engine?

Any information would be appreciated.

Thanks

RCE1962

[MK IISS]

My info indicates a '66 "Z1" suffix code to be the famous 1966 Chevy II/ Nova L79 350 horsepower 327 engine. The L79 had 2.02/1.60 valves. If my memory serves me correctly the Chevy II small blocks, prior to 1968, used a unique block casting.

[real61ss]

Richard,
I think you are correct about the Nova blocks having a unique casting, they did not have a provision for a oil filter cansister. The block used a spin-on filter because of clearance problems in the little Nova.

[RCE1962]

Thanks for your help

RCE1962

[SSpev]

the blocks were cast so the oil filter boss could be machined "deeper" for filter clearance on pre 68 chevy II v8