1flabadz Posted January 15, 2012 Share Posted January 15, 2012 I have an L28, once bored over with triple weber40s, with 36mm choke carbs. I would like to max out my compression and air flow. I've since bought an E88 head, ported and shaved .06mm, with over-sized SS valves and a MSA stage V (560 lift) cam. The combustion chamber on the head has been "eyebrowed", or ground out to accommodate the valve clearance. I know I will have to shim the cam tower to adjust the timing chain to the shaved head. My questions are: Can I use a 1mm metal head gasket to maximize my compression? If so, will I have to "eyebrow the cylinder wall and/or the piston to make room for the over-sized valves. If so, how can you tell? Quote Link to comment Share on other sites More sharing options...
rsicard Posted January 15, 2012 Share Posted January 15, 2012 Use test valve springs that allow hand opening of two valves with keepers and locks. Temporarily assemble head, head gasket to block. Rotate crankshaft till 10 degrees before and after TDC and push valves with test springs along with test depth gauge to get an accurate reading of piston to valve clearance. Quote Link to comment Share on other sites More sharing options...
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