What type of cam would be in my stock 350

[BigBlocksRule]

Looks like '87 was the first year for roller lifters. If you can shine a light through any of the head drainback holes, you should be able to see the tops of the lifter bores are machined flat and look for the spider hold-down bosses are in the middle of the lifter valley. Chances are you're flat tappet.
As long as you don't get radical, you can get a better cam for your engine. Newer oils are low in zinc, the newer roller motors don't need as much but there are still plenty of 'em on the market that are fine. New cam break-in procedures MUST be followed to the letter. Research oils and cam break-in.
As long as you're not going to overhaul the engine, there's not really any good reason to spend the money to upgrade to rollers, just watch what oils you use.
I am not familiar with propane - I'd bet you could find somebody on the net that knows what's up with that fuel and cam selection. I'd keep it small, under about .475 lift. Best towing cams I've used were about 210 - 215 duration with 114LSA.
If your tranny isn't computer controlled, it's a 700R4...

[kikkegek]

Originally Posted by BigBlocksRule

If your tranny isn't computer controlled, it's a 700R4...

he thanks man for all the info. They showed me the old lifter als they are flat. I know remember.

so flat tapped they are. the engine is old, but running fine. Is there a big cost difference in rollers and flat tapped? I might rebuild the engine within the next 2-3 years. So would rollers be a good investement?

problem is I cant find any real good info on the cam selection for propane.

found some info in my cam search:

Here are some basics for choosing a cam from your range:
Large cars: Use short or medium duration, exhaust can be longer. Wide lobe seperation is better.
Small Cars: Use long intake duration, exhaust can be longer. Lobe center seperation can be short.
Propane and Natural Gas: Use short or medium duration single pattern. Wide lobe seperation is required.
Trucks: Use short duration. Wide lobe seperation is better.
Nitrous or Supercharger: Use long duration. Wide lobe seperation is required. Supercharger compression must be lower than shown in the guide.
Turbos: Use short or medium duration, exhaust can be shorter. Wide lobe seperation is required. Compression for turbos must be lower than shown in the guide.

but I dont know really how this info helps me. Summit already offers several choices and lifts for each type of the cams...HELP?

as for the tranny.
http://en.wikipedia.org/wiki/Turbo-H...al_Description

In 1990, the Turbo Hydra-Matic 700R4 was renamed the 4L60. Under the new designation, the "4" stands for the number of forward gears, the "L" for longitudinal applications (rear-wheel-drive), and the "60" is the strength rating (less than the 4L80). "60" is the relative torque value.

since I have a 1991 model its a 4L60....

after 1992 electronics were added and they changed it into 4L60-E