1990 Suburban 350 TBI camshaft question

[stvaughn]

Does this engine have a flat tappet cam or a roller?

Thanks, Steve

 

[geolee]

Flat tappet

 

[stvaughn]

Flat tappet

Thanks, when did GM start using roller cams?

 

[geolee]

Thanks, when did GM start using roller cams?

I think 98 but not positive

 

[77Dmax]

Cars got roller cams in 87. All blocks were cast for the roller provisions at that point, but were only drilled for the spider if needed. I believe trucks went roller in 95 with the SFI, but I could be wrong there.