i might be getting a roller 350 which i think came out of a van. what kind of heads did these engines have? i didn't see the marks on the front of the heads or the casting #s. there was also an 89 truck with a roller 350 in it. on the front of the heads it had 2 diagonal lines about 1/8" thick and 1/2" long about 1/2" apart what heads are these? how good do these heads flow compared to 041s? thx

 

If the engine came from a G20 van, then more than likely they're the 191's or the 193's.

Go here. There's a link in there about what can be done to those heads.

https://www.thirdgen.org/techbb2/sho...hreadid=192114

 

GM didn't put roller cams in trucks & vans until 1996.

 

True. But they did put blocks that can take a roller cam.

 

I put a set of 041s on my truck to replace the 193s, the difference was astounding. Do THAT!