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Forum: General Boating Discussion

09-07-2009, 09:25 AM

Replies: 9

HP500 heads on a MarkIV?

Views: 731

Posted By Full Force

I thought the Merc 400-420 heads were the same...

I thought the Merc 400-420 heads were the same casting as the HP500 heads??? large rectangle port?

Forum: General Boating Discussion

09-05-2009, 10:19 PM

Replies: 9

HP500 heads on a MarkIV?

Views: 731

Posted By Full Force

HP500 heads on a MarkIV?

Do HP500 heads bolt on to a MarkIV block? I am pretty sure they do, but can someone verify?

Anyone have 2 sets of fresh head rebuilds with Inconel valves?

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