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i picked up a set of 340 X heads 2531894 ready to install -sold the car, what's the going rate these days? how do I decode the date?

I am not knowledgable mechanically so forgive me in advance. I have a 72 demon with a 340 block 69 and 360 heads with a purple cam 282/482. The 360 heads are 1.88 intake 1.62 exhaust. I have a complete set of X heads with 2.02 intake and 1.60 exhaust... this is a 4spd street car with a weiand...

I'm getting ready to change the oil for the season, and was asking a few buddies what they use and one of them said they've been using Rotella 15W 40 diesel oil in his 340 for a few years. says it seems to hold the viscosity better when hot and oil pressure is never below 30psi at idle. Anyone...

Over the winter I am going to be changing the cam. I picked up a set of complete X heads ready to bolt on. I am running stock exhaust manifolds and don't want to go with headers. Should there be any issues bolting up stock exhaust manifolds w the X heads? motor has stock heads, a 474 lift...