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09-18-2019 | 02:18 PM

#51

Raging Boater

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I gotta say between all this info and the builders recommendation , summer is over here in NY- gonna pull the motor and tear down.
Thanks for all the info I’ll update with findings!!

09-18-2019 | 10:44 PM

#52

Raging Boater

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Quote:

Originally Posted by BillK

Are you sure its coming out of the breathers and not a leaking valve cover gasket getting oil on the exhaust manifolds ? That's crazy looking

Is it smoking out of the exhaust at all ?

no smoke from exhaust

09-18-2019 | 10:47 PM

#53

Raging Boater

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Quote:

Originally Posted by F-2 Speedy

Does the MK IV run a lifter valley pan ? what intake are you using...Bowtie 10.2 block

dart intake. I don’t know what a lifter pan is, sorry!! It is a bowtie block

09-18-2019 | 10:51 PM

#54

Raging Boater

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Quote:

Originally Posted by ThisIsLivin

You're absolutely sure the oil looks good? No fuel smell, no white streaks, foamy, changes in viscosity? What ever this is, it has to pass through the crank case. I had an old Pontiac 389 that the valve guides were so bad the engine wouldn't run with the valve covers off and it didn't smoke like this. Puffing indicates this is a combustion related issue or at least related to one or a few cylinders not all. Is this a closed cooled motor or seawater? If you have through hull exhaust watch your exhaust closely, have someone follow you and see what your exhaust is doing. What temp does your motor run at?

yes sir 100% sure oil is good. Sea water cooled and boat runs at the highest so far (haven’t abused it) between 105-120
i have thru Hull .. it’s dry exhaust but no smoke comes from the exhaust

09-19-2019 | 12:44 AM

#55

Griff

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From: Omaha/LOTO

Quote:

Originally Posted by Raging Boater

I can’t get the video to play

Videos need to be uploaded to youtube or similar and then linked

09-19-2019 | 07:41 AM

#56

ThisIsLivin

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From: Cheboygan, MI

Go to a junk yard and get some old valve covers, cut the tops off and put them on and start the motor. Try to find the source of the steam/smoke.

09-19-2019 | 08:14 AM

#57

flashgordon

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From: new baltimore mi

Quote:

Originally Posted by Raging Boater

dart intake. I don’t know what a lifter pan is, sorry!! It is a bowtie block

https://www.summitracing.com/parts/n...SABEgIpVfD_BwE

09-23-2019 | 06:53 AM

#58

flashgordon

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From: new baltimore mi

SO,,,,,what was issue????

09-23-2019 | 07:49 PM

#59

Tinkerer

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From: ALTO, MI

Obviously something is getting hot that has oil on it.
Any chance the heads are not getting proper water flow or air pockets.
I can't see the valve train getting that hot that quick.
I don't think it is a piston or rings problem.
What I am thinking is that the top of the exhaust ports under the valve covers are getting HOT due to lack of water flow or air pockets. Wrong head gaskets? The oil from the valve train gets on it and burns off.
Take a valve cover off and look for burnt oil on the top of the head.