engine ID question ?

[pjv911]

I am setting the cam timing on a 77` 2.7 motor and need to know which spec is correct for that engine. The manual lists engines as 901/03 , 901/05 , 901/07 and so on. Which is the correct engine ID# for a 77` 2.7 ?
Thanks

[pjv911]

Oh yea, if you are using new chains should you lean more in one direction (more advanced) for correct cam timing considering chain stretch on initial break in ?

[RarlyL8]

Type # for '77 ROW 2.7L is 911/81.
For 911S USA 50 state is 911/85.
For 911S Japan is 911/94.

All share the same valve timing as 911/42, the 1975 2.7L 911S CIS engine:
In opens 6 ATDC
In closes 50 ABDC
Ex opens 24 BBDC
Ex closes 2 BTDC

(all information taken from B.A. bible #2, pages 109 and 110).

[pjv911]

thanks