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#1
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86 150 EVINRUDE will be a cross-flow engine and have a bubble back exhaust on it most likely. The looper engines will have a one piece block whereas the cross-flow engines will have plates that bolt onto the sides of the cylinders and the exhaust will also have a plate bolted on it between the 2 heads. The main thing to look for is that all the cylinders are the same or within 5-10% of each other. Normal compression on that engine should be in the 90-100 pound range on a fresh tight engine, but years of use and carbon build-up can and most likely will change those numbers.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#2
05-14-2010, 05:21 AM
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Had an "84 150 horse on the V before repowering with the current motor.
At the time of swapping out the engines it had 89/90psi on all cylinders, same as it was 3 years prior to mounting it on the boat. Like ferm said, most important thing would be near even compression between all the cylinders.
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 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny
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