I'm replacing the intake/ exhaust manifold with one with a working heat riser and it might be the right time to check on the head gasket. I have had the 55.1 3600 six years. one of the first things i did was sent out the head for a rebuild and over the years adjusted a little here and there and got the engine running strong. i do use alot of oil and the spark plugs toward the rear (#5 and 6) are always oily. there is also oil seeping below the spark plugs(5 and 6) where the head meets the block. i did a compression check and it was 120 at all cylinders except #3 (105) it also seems to burn more at high revs and less after fully heating up. Since i will have the parts off the engine do you think it a good time to look into this or is this not a head gasket issue. thanks Brian
