My truck has the A.I.R. pump that hooks up to the exhaust manifolds.. can I just use the belt made for 350 without A.I.R. ?? is this going to affect the ecm? what are the pros/cons of doing this?

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'88 C1500 350 TBI
Belltech 2/4 Drop,
Nitro Drop Shocks,
3.73 Rear gear ratio,
Edelbrock performer TBI intake, performer cam, timing chain,
Hiflow cat with Rhino dual 2 1/2" out the rear.

 

Jeff, It will do nothing for performance to re-route the belt!
If you dont have smog checks and just want a cleaner engine bay than go for it. It will not through a code or damage the engine in any way.
SSC