How do you tell what liter your Slant 6 is?

Thanks, yeah I was curious about that myself, because autozone tried to sell me one saying if you change the water pump u should change the clutch fan too, because they are in same area. So I thought I check first to make sure.
Also now in another situation, was changing out the valve gasket, and noticed one of the valve bolts was broke off into the motor. So now I have to try and figure out how to get bolt out and also placing a new one back in. Someone told me I would have to drill it out and then drill a new hole.
Does anyone have any recommendations on how or what procedure to attempt?
Thanks
Get your self an easy out they will save you so much hassle, you drill a small hole in the center of the broken bolt then gently tap the easy out into the hole then put a ratchet on and turn it opposite thread and if it doesnt grab gently tap in a little snugger and it should grab the broken left overs and turn it rite out with no need to re-thread the hole. The make a good range of sizes.