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Forum: Engines

02-22-2017, 01:17 AM

Replies: 8

Mercruiser engine differences

Views: 2,100

Posted By speedysprocket

The cam profiles are different, but I'm not smart...

The cam profiles are different, but I'm not smart enough on cam timing and such to know how significant the difference is and if the roller lifters make up for it at all.
Now that my props are...

Forum: Engines

10-17-2016, 10:02 PM

Replies: 8

Mercruiser engine differences

Views: 2,100

Posted By speedysprocket

Pretty sure it's the same valve train after the...

Pretty sure it's the same valve train after the pushrod. V and VI have rocker bolts unlike the studs on a IV.
The big changes were really between IV and V

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Forum: Engines

10-17-2016, 06:09 PM

Replies: 8

Mercruiser engine differences

Views: 2,100

Posted By speedysprocket

Ok. Gen VI has a roller cam and my Gen Vs were...

Ok.
Gen VI has a roller cam and my Gen Vs were flat tappet. No other meaningful differences.

Forum: Engines

10-16-2016, 10:30 PM

Replies: 8

Mercruiser engine differences

Views: 2,100

Posted By speedysprocket

Mercruiser engine differences

Anyone smart on 7.4L generation differences? My boat has two gen V engines. I just picked up a gen VI long block to rebuild. I know it's a roller can instead of a flat tappet. Are there any other...

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