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Old 08-26-2013, 10:11 PM
harleyds2 harleyds2 is offline
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Indmar 351 valve cover clearance

I just rebuilt an Indmar 351 with roller rockers and the taller valve covers do not allow installation of the exhaust manifolds. there is not enough clearance between the manifold and cover..

Anyone been up against this? Solutions?

Thanks!
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Old 08-26-2013, 10:17 PM
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j.mccreight@hotmail.com j.mccreight@hotmail.com is offline
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Originally Posted by harleyds2 View Post
I just rebuilt an Indmar 351 with roller rockers and the taller valve covers do not allow installation of the exhaust manifolds. there is not enough clearance between the manifold and cover..

Anyone been up against this? Solutions?

Thanks!
Yep, I went through this as well. Summitracing sells flanges that can be used as spacers. http://www.summitracing.com/search/p...d=351w+exhaust or you can have the manifolds milled at an angle to clear the valve covers.
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Old 08-26-2013, 10:21 PM
harleyds2 harleyds2 is offline
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THanks for the info.. does the milling hurt the integrity of the water jackets?

With the flanges how do you gasket them?
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Old 08-26-2013, 10:33 PM
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Originally Posted by harleyds2 View Post
THanks for the info.. does the milling hurt the integrity of the water jackets?

With the flanges how do you gasket them?
I did the flanges and used percy aluminum gaskets on both sides required longer bolts and don't over torque them.
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Old 08-26-2013, 10:41 PM
harleyds2 harleyds2 is offline
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I appreciate the info..I've been stewing on it since saturday when I reinstalled the motor. I've been wondering if there is a valve cover that will accomadate the rockers and still allow clearance to the manifolds

How thick are the spacers? which ones did you use and how many?

THe old boat hasn't been in the water in 6 years and is anxious to jump back in
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Old 08-26-2013, 10:55 PM
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I originally bought these slant edge valve covers to try and add clearance but they still touched I bought the 3/8" round flanges and quickly found out I need rectangle port.

http://www.summitracing.com/parts/pro-302-138
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Old 08-26-2013, 10:59 PM
harleyds2 harleyds2 is offline
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Thanks!

Did you find any difference in the summitt vs patriot or other brands? I thought I was goint to have her running Sunday, after wiring in the new MSD stuff, then this thru a wrench into the gears.

Many Thanks!
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Old 08-26-2013, 11:02 PM
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j.mccreight@hotmail.com j.mccreight@hotmail.com is offline
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Quote:
Originally Posted by harleyds2 View Post
Thanks!

Did you find any difference in the summitt vs patriot or other brands? I thought I was goint to have her running Sunday, after wiring in the new MSD stuff, then this thru a wrench into the gears.

Many Thanks!
I think I used summit brand, didn't really matter as I had to turn the round ports into rectangle ports.
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Old 08-26-2013, 11:03 PM
harleyds2 harleyds2 is offline
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was the 3/8" flanges enough without the different valve covers?
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Old 08-26-2013, 11:06 PM
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was the 3/8" flanges enough without the different valve covers?
Dunno I replaced the valve covers first, currently probably have 1/4" clearance, they look pretty good on the motor tho.
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Last edited by j.mccreight@hotmail.com; 08-27-2013 at 09:28 AM.
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