ive heard that around 80' chrysler switched to the hyraulic lifters..etc.
i have a mystery engine that's from 67'-mid70's and i want to put in a custom solid grind from comp cams. did chrysler only put in the hydraulic cams in around 80' or were there some in before that in earlier years?
thanks

There was a small-scale production test of hydraulic-cam slant-6s in the 1978 model year, then no more until 1981, when all slant-6s went hydraulic. So, all 1960-1977 slants are solid, the vast majority of 1978s, all 1979s and all 1980s are solid. A few 1978s and all '81-up are hydraulic.

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Too many people who were born on third base actually believe they've hit a triple.

how can you tell which is which on the lifters?

Easiest way is remove valve cover - if rockers have adjustment screws its solid if not then hydraulic.

soo i took the valve cover off and sure enough adjustable lifters..so i have to assume the engine is pre 1980 right ?

Yep, correct.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Thanks Dan...i thought I read the smaller spark plugs were used after 1980..this engine has the small plugs but obviously has solid lifters..i posted on the board for information on identifying the block but i got no response..its listed as "engine numbers"..if you get a chance id appreciate your input..thanks..Mark

Small spark plugs started for '75.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.