exhaust manifolds have weird "burn" pattern in them?
11-07-2010, 10:42 AM
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11-07-2010, 12:53 PM
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What carb and intake is on it and was there a carb adapter to go from a weber holley square bore bolt pattern to the stock gm spread bore if so that is your lean problem it is a
sh!tty set that mercruiser will do to make the cheapest set up to make it run. they did that with all the 330's
sh!tty set that mercruiser will do to make the cheapest set up to make it run. they did that with all the 330's
11-07-2010, 04:09 PM
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What carb and intake is on it and was there a carb adapter to go from a weber holley square bore bolt pattern to the stock gm spread bore if so that is your lean problem it is a
sh!tty set that mercruiser will do to make the cheapest set up to make it run. they did that with all the 330's
sh!tty set that mercruiser will do to make the cheapest set up to make it run. they did that with all the 330's
11-07-2010, 04:27 PM
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well heads are off, cylinders 1 and 8 are the leanest cylinders judging by the combustion chamber. i'm surprised how clean the chambers are for a 500 hour motor, actually everything on this motor is clean clean clean inside. bores look mint, still see nice cross hatching in them/ luckily no surprises have been found!
12-13-2010, 12:24 PM
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12-13-2010, 07:18 PM
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12-13-2010, 07:28 PM
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Extended tip spark plugs bring spark event closer to piston, similar to timing advance.
Last edited by racinfever; 12-13-2010 at 07:29 PM. Reason: duplicate
12-13-2010, 07:39 PM
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Sorry, didn't mean to hijak.
The light color holes do look a bit leaner, but the heads and ports look overall pretty good! By any chance you didn't happen to run a tank of race gas did you? Leaded fuel will give a white/grey color to exhuast when tuned properly.
