Ya, I did this for my engine. I installed the head on the block without changing anything, then measured the valve to piston clearance at TDC by compressing the rocker arm and measuring the travel on the tappet until it stopped. It, of course, was not enough, so I took it to a machine shop and had them cut valve releifs on each cylinder. Luckily for me, the previous owner broke the timing belt, leaving marks in the piston crown from the old valves; this gave a good guidline as to about where the releifs needed to be. After the pistons were modified, there was plenty of clearence (I believe .075"? is necessary...but it was 3 years ago). I've since run the engine plenty, and up to 5000 RPM with no catastrophic failure.
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Originally Posted by blownb310
Guys,
Have any of you ever tried installing a big valve 15M head on a stock E16 shortblock? I know the pistons tops will need some clearancing to clear the larger 15M valves. Anyone ever gotten a die grinder out and fuged it like I am about to? 
Mike |
