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This is a pic of the valley of my 350. It’s lower miles and I am considering throwing a set of summit heads on it. When I took it apart I noticed it has the bolt holes that I think hold the spider to keep roller liters in place. Or do all 350 blocks have these?
Roller versus flat tappet cams. All 1987 blocks have the provisions for the roller cam just the trucks didn’t get them. However in some 93, all 1994 and 1995 engines GM stopped drilling and tapping the bolt holes in the those provisions in the block. Roller cam will give you the same power as a flat tappet cam that is about 15 degrees duration bigger or about 10-15hp more than the same duration flat tappet cam. This allows you to run a milder roller cam that gives you better low end torque and horsepower and have the same peak horsepower as a cam that will have weaker low end power. If you can afford to go roller, GO ROLLER.
