My bet is the pushrods are too long or too tight, holding the valves open. Even if the cam was off, you'd get some compression.
Bob
tufcj
I totally agree....I don't get any attempt to start....I have spark and fuel just no compression. Only thing in common is the cam and pushrods. What else is odd these are non adjustable rockers, so it isn't like I adjusted too tight like on a Chevy.