I am planning on building a 383 this winter and was wondering what the differences between the 94 and 95 block are and if you can just change the timing cover opti. I have a 95 with a buddy that has a 94 that needs rebuilding and would like to be able to pull and install motors in the same weekend. Any info is grately appreceated.
thanks in advance,
duals

 

1994- nonvented opti (cam dowel is different, timing cover different)

1995- vented opti

1994 dash harness different from 1995 dash harness.

Year of the engine harness/pcm must match year of dash harness.

everything else should be the same...

 

so all I need to do is keep 95 timing cover and vented opti and I can use 94 block for my build, correct?
thanks again,
duals

 

Duals. What part of Iowa do you live in?

 

yes, blocks are the same 92-97

 

I live in Decorah, (NE corner)

 

yeah, 1994 block... 1995 timing cover/timing gears, 1995 opti, and you have to alter the dowel on the cam to complete the vented swap.

 

all lt1 blocks are the exact same. with the exception of the vette's which are a 4 bolt main.

 

thanks for the info guys. planning to move ahead as originally planned.