Yep. those blocks hard to come by cheap.The 170 in my V runs great, I just rebuilt it about 50 hours ago. I checked out my spare motor this morning and found my problem with #4 cylinder. I pulled the valve cover and checking the valve to rocker arm clearances, I found that the intake valve is not closing all the way.When I seated the valves I think that was the one that had a partialy burnt valve face.I had to use medium and fine lapping compound to seat that one. I must have taken alot off the face and seat. I guess I could shim the rocker or take alittle off the valve stem. I know they do make different length pushrods but I dont have any. What do you think Spare?
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77 V20 cuddy with 170 I/O Mercruiser
72 16ft. Carolina w/a 25hp Evinrude
Last edited by cfelton; 02-03-2011 at 09:53 PM.
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