jasper reman engine questions - Third Generation F-Body Message Boards

firebirdguy1180 · 05-06-2009, 01:00 PM

I recently purchased a jasper remanufactured 350 for my firebird and had it installed at my mechanic . I understand there is a break in process but my question is the 350 doesn’t seem as quick as my old 305 why is that ? I have about 1000 on it now at 500 I went back and he adjusted the lifters the engine still runs rough he said that the rings need to seat still . im not really a car guy so I was just wondering if this sounds alright . With more miles will there be a performance increase ?

AlkyIROC · 05-06-2009, 03:08 PM

The rings will seat within the first 30 minutes of the engine running. If the engine isn't performing well now, it won't get any better on it's own.

five7kid · 05-06-2009, 07:50 PM

Sounds like one of the following:

- Your mechanic didn't adjust things properly (timing comes to mind)

- You have a speed density EFI system, and didn't reprogram it for the additional displacement.

- You didn't get the right type of engine

- Another case of a bad Jasper engine sold to a private individual (they seem to support regular customers very well)