RE: Magnum Engines?
I'll never buy another. I got a defective one right out of the box from the LHS and shipped it back. I got another one with an attached note that really didn't fit what was wrong with mine at all. Telling about how it was run wrong etc.. even tho it was "new in box" when sent back. They did send me another pretty quick.
It sucked - the head gasket had a split in them (it appears like after I removed the head there was a major gap like a piston ring not a head gasket) I threw it away - the whole engine.