16 yo sons first purchase. 1994 C1500

What year did chevy stop casting their blocks with the intake guide holes in them for the gaskets?

 

are you talking about the front and rear gaskets for the intake? ive never had any luck with them anyway and end up using "the right stuff" rtv sealant

 

I was just wondering what year the block might be because that’s what it has in it right now. I had one guy thinking it was a late 60s block. But we used rtv for the gaskets also

 

just looked at the gasket set and it list a 2000 tahoe with the 5.7. i would think they never got rid of them and goes back to 1975. there was a change in where the oil dipstick was at. i believe the year was 77 they changed it from the drivers side to passengers. but casting numbers will tell you a lot more