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Showing results for tags 'Head Bolt Torque'.
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Hey all, I finished a Frankenmotor build about a month ago. I used the short block out of a '96 OB, and the heads from a '96 Legacy. I surfaced the heads on my own via the flat board/sandpaper method. I used .056" thick Cometic MLS headgasket with their hybrid pattern. This is my third HG replace dealing with a Subaru motor, and I have other background experience with Toyota motors. I'm just trying to convey that I'm not unfamiliar with these things, nor to say that I'm an expert. I have found coolant seeping from the passenger-side head upon start up. It'll seep out onto the exhaust and smoke. After running to temperature/driving, the seepage stops and all is dry underneath. I have not seen any white smoke from out of the tailpipe; usage from the over-flow tank is not unreasonable. I followed the directions for headbolt tightening via the FSM. Doing this before, I've yet to see this seepage. But I was also using OEM headgaskets from Subaru. The MLS HG was pretty beefy. The rings surrounding the combustion chambers were aggressive. I've talked with some big-power-turbo Subaru enthusiasts, and they've mentioned different specifics for the torque. They use 30-60-90ft-lbs (I believe those were the numbers they referenced...) increment increases (first tightening is 30ft-lbs, second go around 60ft-lbs...). Is it possible that the FSM procedure doesn't squeeze the MLS HG enough? Can I safely tighten the head bolts now? Say another 25-45 degrees? Or is there an torque end-value that is actually achieved via the FSM process? Or is this a moot point, and I should be preparing for a HG replacement? I watch my gauges and fluids religiously, so I know that I could probably get away with driving it more without overheating. Any advice will be appreciated. Greg