Building a 1999 LM7 truck motor for my 1987 Fire-bird LS swap. 4L60e, 373 gear, 3000-3600 stall (not yet purchased). Stock heads and flat top pistons oversize (50MM). Building this vehicle for only street use and I am looking for a street/performance cam mainly for mid range with occasional high end. Looking for a solid street cam.

My thoughts are;

Summit 8720 stage 2 high lift truck cam
Summit Ghost Cam
Summit 8707 Stage 2 automotive cam

any thoughts would be very grateful, members and Summit techs..

 

Welcome aboard. I would call one of the main players in LS cams (Cam Motion, Brian Tooley, etc) and have them talk you through their cams. You'll get what you want, based on your goals, without going too big on the cam. Something under 220 duration and .580 lift is likely where you'll land. I'd spend some time watching cam swap vides on YouTube. Texas Speed and Richard Holdener have countless videos walking through dyno tests of various cams.

 

Thanks I will look into that. I was looking at the Summit 8720 Cam because of Richard's dyno video. Also, Summit 8707 cam might be a little big for my intended purpose from what I am reading.

Thanks..

 

That certainly isn't a monster cam, but it will act bigger in a 5.3. A small cam, even a step up from stock goes a long way in these cars. Also, if you go too big, you'll have the added expense of buying a matching torque converter. The specs on that summit cam are almost identical to the comp cam I am running in my 6.2. May be a bit too steep based on your goals.