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PostPosted: Tue Apr 07, 2020 9:44 pm 
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Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 3220
Location: Indianapolis
Car Model:
Vizard says a valve is geometrically de shrouded when the clearance between the valve and the wall is .20D of the valve at .250 lift.
The illustration in DV’s book shows a combustion chamber wall that angles away from the valve head as the valve is opened. Hence the comment on the .250 lift.


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PostPosted: Wed Apr 08, 2020 1:58 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 6741
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Quote:
.20D of the valve
:?: :?:

Does that mean 20% of the diameter of the valve?? If so all Slant 6 valves are probably shrouded :D

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2 Mopars come with Spark plug tubes. One is a highly refined, world class, racing machine. The other is a 426 CI. boat anchor!
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PostPosted: Wed Apr 08, 2020 7:19 pm 
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Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 3220
Location: Indianapolis
Car Model:
Yes and Yes


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PostPosted: Fri Oct 02, 2020 11:17 am 
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TBI Slant 6

Joined: Thu Apr 18, 2019 7:57 am
Posts: 144
Location: Lawrenceville, GA
Car Model: 1966 Dodge Dart
Finally back on this one. The cylinder head has been ported and gasket matched, as has the intake. The exhaust manifold did not need any gasket matching.

Attachment:
File comment: Cylinder head porting
bowl work complete.jpg
bowl work complete.jpg [ 108.64 KiB | Viewed 556 times ]


Then I dropped the head off at the machine shop for a valve job and cutting the valve guides down for more clearance and positive type valve stem seals. Still waiting on that.

But then it turns out some of the items I've ordered aren't quite right. The freeze plug set didn't include the cam plug. Is there supposed to be some sort of thrust bearing on it? And the bearings listed under part number BC321J - Rockauto lists these as correct for a slant six as of today - definitely aren't right.

Attachment:
File comment: Wrong bearings.
bearings dont fit 1.jpg
bearings dont fit 1.jpg [ 222.75 KiB | Viewed 556 times ]


Then I realized I had five sets of bearings instead of four... looks like they sold me a set of small block V8 bearings.

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Matt Cramer
1966 Dodge Dart turbo / EFI project


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PostPosted: Fri Oct 02, 2020 6:36 pm 
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Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 3220
Location: Indianapolis
Car Model:
No cam thrust plate/washer on a slant,,,
Lot of folks do the rocker adjusting screw welded
into the timing chain cover routine.


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PostPosted: Mon Oct 05, 2020 8:06 am 
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TBI Slant 6

Joined: Thu Apr 18, 2019 7:57 am
Posts: 144
Location: Lawrenceville, GA
Car Model: 1966 Dodge Dart
DadTruck wrote:
No cam thrust plate/washer on a slant,,,
Lot of folks do the rocker adjusting screw welded
into the timing chain cover routine.


Thanks, I'll do something like that - particularly since I'm going to be using the Rollmaster double roller timing chain.

_________________
Matt Cramer
1966 Dodge Dart turbo / EFI project


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