in 86 did the LB9 get a roller cam or a flat tappet cam cause I looking for a cam and some say 86-up for roller cams and others say 87-up

my car: 350tpi but set up just like the stock LB9 and the car is a late 86'

 

87 marked the beginning of the factory roller provisions. The reason you probably see some listing 86 and others listing 87 probably lies in the fact that there's really no clean-cut line between 86 and 87. Late calendar year 86 parts could be classified as early 87. However, 87 vehicles could easily be equipped with leftovers from the previous year (86). So it's a toss up really.

Here's what I've done: remove the valve cover and randomly pick one of the 8 rocker arms you see. Loosen it enough to the point you can remove a pushrod. Yank it and take out a measuring tape. If it's closer to 7.75", you have a flat tappet cam. If it's closer to 7.25", you have a hydraulic roller. The actual numbers don't really matter as there is about a 1/2" difference between the 2, one being obviously longer. When done, put that rod back in, tighten the rocker down and start the engine. Set the lash on that single rocker with the running engine method.

 

for the info

 

So your engine is a 350 but it isn't an L98 by the sounds of it.
That would mean it's a swap, correct?
In that case the pushrod length would tell you if the engine is equipped with a roller cam, but if it isn't a roller cam, there's still a possibility that it could be a roller block. Some blocks after 87 were flat tappet but they have the factory roller provisions which means that they can be retrofit with a roller using factory parts.

 

You can just pull the valve covers and use a flashlight to look through the oil drain back holes.

If you see the roller set up (the spider, dog bones, etc.) you have a roller cam.

If you don't, you don't.