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Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:
Buick 300 heads porting and valve guide
Posted by: Wotland
Date: August 21, 2008 05:16AM

Hello,

I removed valve guides from my pair of aluminium Buick 300 heads to port them.

Inlet port before :
http://i54.servimg.com/u/f54/11/14/83/96/genuin12.jpg
Inlet port after :
http://i54.servimg.com/u/f54/11/14/83/96/buick_14.jpg

Exhaust port before :
http://i44.servimg.com/u/f44/11/14/83/96/buick_20.jpg
Exhaust port after :
http://i44.servimg.com/u/f44/11/14/83/96/buick_17.jpg

I am looking for Bronze valve guide. There is an compagny who sells them ? Any recommandation ?

Thank.
Dimitri


hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

Re: Buick 300 heads porting and valve guide
Posted by: hoffbug
Date: August 21, 2008 06:33AM

[www.precisionengineparts.com]


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6508 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Buick 300 heads porting and valve guide
Posted by: BlownMGB-V8
Date: August 21, 2008 08:19AM

There is one thing you may have an issue with. The bore of the guides may not be concentric with the OD because of the production process where the seat pocket and the guide were machined at the same time but not indexed on the guide OD. Better check that right away as corrections may need to be made.

Dale Spooner (Motion Machine in Danville, VA) has the bronze inserts.

Jim
Get Your BritishV8 T-shirt by clicking here


NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: Buick 300 heads porting and valve guide
Posted by: NixVegaGT
Date: August 21, 2008 09:09AM

That was a problem on mine. I also needed to have custom sleeves pressed in through the guides for the thinner 7mm stems I got.

Did you break through to the bolt hole on the exhaust port? Does that matter? I mean do you have to have that welded shut or just plug it with the bolt and be done with it?


Moderator
Curtis Jacobson
Portland Oregon
(4598 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Buick 300 heads porting and valve guide
Posted by: Moderator
Date: August 21, 2008 06:11PM

Quote:
The bore of the guides may not be concentric with the OD because of the production process where the seat pocket and the guide were machined at the same time but not indexed on the guide OD. Better check that right away as corrections may need to be made.

For more on this... Rover Valve Guide Options


Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:
Re: Buick 300 heads porting and valve guide
Posted by: Wotland
Date: August 22, 2008 10:32AM

Thank for your help.

During porting we have gone into the thread for exhaust manifold bolt. The problem is the thread in head is very deep. If you look an standard port you can see an little extension in casting for the deep thread.
But it is not an problem as we will use exhaust manifold studs. An small aluminium insert has been done to obstruct inside the thread the small hole at the end of the thread.

I found Bronze Valve Guide For Rover V8 - Machined For Seal (EA $7.50)
[www.aptfast.com]


NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: Buick 300 heads porting and valve guide
Posted by: NixVegaGT
Date: August 23, 2008 11:09PM

Quote:
An small aluminium insert has been done to obstruct inside the thread the small hole at the end of the thread.

Smart! Post some pix when you get them together.



Edited 1 time(s). Last edit at 08/23/2008 11:09PM by NixVegaGT.



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