TBI == large round air cleaner on top of the motor.

CPI == black plastic trim on top of the motor with orange VORTEC lettering.

 

well mine is silver does that make any differance?

 

Ok, lets try this again...

Pictures say a 1000 words:

TBI:

CPI:

 

The 93 will most likely have the CPI in it

 

thanks guys i owe you so much. Do i need a special engine for the 4*4 part?

 

No, the 4x4 attaches to the tranny. You will need to reuse your remote oil filter adapter though.

 

ok thanks again guys do you know what engines will fit in the blazer like a list of them? 305's 4.3L's and what yrs and from what models etc.

 

if you want to go old school i have a virgin 67 327 (small journal) well was virgin i bored it out 30. it has h beam rods with sealed power pistons. the crank is going to get turned 10. i havent decided on a set of heads. i have a edelbrock RPM intake with a new 650 cfm carb on a 305 that is in my C10 now. i cant decide on a cam either.