[67whitetrashbird]

So I took the heads off my 400. I see that the pistons are Speed Pro Forged and they are 030 over and have 4 relief cuts on the top. The guy I bought the car from knew nothing about the car. So now I'm trying to figure out the compression I'll be at using 670 heads. I've used the calculator on wallace racing and it's going to be high. I'm just hoping that the relief cuts give me a little drop and maybe throw in a Cosmetic gasket. Do they????? If not I'm going to have to get a new set of dished pistons or have some head work done to open up the heads. I'm using a XE 284 cam and it needs 9:1 compression to work.