Is A '91 350 Tbi A Roller Cam Motor?

[nhproxr]

I have a '91 3/4 Suburban I am parting and trying to sell the 350 in it. I was wondering if someone could verify that the engine is a roller lifter motor? I'm 99% sure all the TBI engines with the center bolt valve covers were roller cammed, just wanted to be sure.

 

Thanks!

[05W/T]

305 and 350 were not roller cammed in trucks until 1996 Vortec. The 4.3 V-6 was roller cam starting in 1987. The V-8 blocks were set up for roller cams in 1987 but retained the flat tappets. They had the bosses cast into the block to accept the tin "spider" that held down the dog bones for the roller lifters.

 

Brian

[nhproxr]

305 and 350 were not roller cammed in trucks until 1996 Vortec. The 4.3 V-6 was roller cam starting in 1987. The V-8 blocks were set up for roller cams in 1987 but retained the flat tappets. They had the bosses cast into the block to accept the tin "spider" that held down the dog bones for the roller lifters.

 

Brian

 

Okay, thanks!

[Genuinefine409]

I have a '91 3/4 Suburban I am parting and trying to sell the 350 in it. I was wondering if someone could verify that the engine is a roller lifter motor? I'm 99% sure all the TBI engines with the center bolt valve covers were roller cammed, just wanted to be sure.

 

Thanks!

 

 

the car engines 87+ did get roller cams. not sure what year they started but i know early 90's caprices had roller cams.

[BigBlaze]

completely useless information, but my 91 Trans Am had a tuned port 305 with a roller cam... 350 TPI's didn't.......

[uh6tdrvr]

All 87+ cars got roller cams but the trucks didn't get one until 1996 (Vortec). The trucks have all the provisions for the roller equipment but just didn't get the parts.

 

Part list for converting to roller cam should you want to go that route.

 

GMPP P/N 12371043 = timing chain/gears and roller cam retaining plate kit (1st and 2nd design plates!)

GMPP P/N 12371042 = 2nd design (higher ball preload) roller lifters (16) with (8) lifter aligners and (1) spider hold-down and (3) spider attaching bolts/washers.

GMPP P/N 10456413 = bronze HEI (large-cap, non-computer controlled internal-coil HEI) gear for use with steel roller camshaft.

[billyhoss]

sorry to bud in but if i had a 305 with a roller cam and had a truck 350 without can i use the parts from the 305 to convert it to roller? pretty sure it can but want to make sure.