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305 details.

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313hitman
12/7/2006 10:59:17 PM
Im looking for details on a stock 92 tbi 305 engine in a caprice. my pops told me that the stock 305 tbi runs a roller cam but I wanna know for sure. plus I want to know if I can remove the A.I.R pump and put on some headers. thanks everyone...
btotheh33
3/11/2007 12:38:17 AM
No it  dont have a roller cam and you can remove the air pump and all the plumming. I did it but i didnt replace my manifolds with headers and i had to plug all the holes in the exhaust manifold  where the steel line went fron the A.I.R. system. I also remover my a/c and replaced it with an aftermarket pully from advanced auto that bolted right in place of a/c pump. I'll get the part number for the belt i used. I just routed the old one and pinched a vise grip on the slack and they matched one up for me.
313hitman
3/23/2007 12:52:44 AM
will removing the a.i.r systems cause the car to act different??
countilaw
4/28/2007 8:53:48 PM
Yes the 305 does have a roller cam.    Removal of the  air pump will not affect the running of the engine, but it will not pass emissions inspections,  it will burn up the catalytic converter. 
1968 Pontiac
5/27/2007 6:45:09 AM
I beg to differ on burning out the cat. My 92 chev K2500 truck with 305 tbi came from the factory without a smog pump. It just passed a smog test. That was with a brand new exhaust front to back, including headers, but the cat I removed was the factory original monstrosity, which would have been passing e-tests as long as we've had them here. Some of these trucks came with smog pumps and some didn't, but I don't know what the deciding factor was at the factory. But, a bad or removed O2 sensor will allow too rich a mixture to pass through the cat, causing premature failure of the cat.
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