If you have a coolant and not an oil problem you might give Moroso's engine sealer a try. Stuff is about 13$ a bottle at jegs and put my 95 dohc back on the road after I over heated it about 20 times. No problems since then. Seems to good to be true but I have a pal been at jegs for 20 years and sells the stuff all the time. never had a complaint. Worked for me, and after I got it so hot on the freeway it shut itself off. I got a litt pi$$ed off that day and just leter run.