1971 Buick 455 GS F/SA G/SA Build

HP HUNTER · 03-21-2017, 09:13 PM

I proceeded with the valve job, and of course after setting my valve depths there was one problem child, a seat that would not come in at the proper height after replacing all the guides, good thing I had seats made to fix this potential problem. I installed a intake seat, problem fixed. Valve job is done, CCs will be set at 59.5.

Alan Nyhus · 03-22-2017, 08:19 AM

Nice work, as always. Those Buicks are cool.

-Al

Daran Summerton · 03-22-2017, 09:59 AM

Looks great to me! I play with Olds and tried the trick valve seat angles and now back to 45. I think with aggressive dwell square cams it leads to uncontrollable high gear problems, I even tried 250 on the seat. Also going back to cast iron guides, have learned bronze has different expansion rates and will tighten down. Good luck!

Paul Precht · 03-22-2017, 02:11 PM

Quote:

Originally Posted by Daran Summerton

Looks great to me! I play with Olds and tried the trick valve seat angles and now back to 45. I think with aggressive dwell square cams it leads to uncontrollable high gear problems, I even tried 250 on the seat. Also going back to cast iron guides, have learned bronze has different expansion rates and will tighten down. Good luck!

Are they the thin wall guides you were using.

Rich Biebel · 03-22-2017, 03:11 PM

Solid bronze will seize up. I had it happen on my tow vehicle. Exhaust valve got hot pulling a hill and valve started to seize and bent hitting piston. Screw-in bronzewalls or thin wall types never a problem like that. They are softer and more self lubricating. They do wear more easily though. Cast iron guides also can easily seize. I honed thinwalls and screw-ins until the valve would spin free and never had one seize. Nice pictures and work on those heads. Makes me want to go back and do that work as I did for years.

Daran Summerton · 03-22-2017, 04:12 PM

Solid is for alum heads only - never knew. Liners are ok

Rich Biebel · 03-22-2017, 06:41 PM

Sold bronze will work in iron heads but they need a little more clearance on the exhaust side.
I have seen many places not use seals also to let a little more oil in there on that side.

After I thought about it the guide that seized on my tow vehicle was a screw-in bronze.....Only one to ever do that in my memory...

I like the thin walls the best....honed to fit with a Sunnen hand hone....

03-21-2017, 09:13 PM	#1
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 656 Likes: 86 Liked 373 Times in 129 Posts	Re: 1971 Buick 455 GS F/SA G/SA Build I proceeded with the valve job, and of course after setting my valve depths there was one problem child, a seat that would not come in at the proper height after replacing all the guides, good thing I had seats made to fix this potential problem. I installed a intake seat, problem fixed. Valve job is done, CCs will be set at 59.5. Attached Thumbnails Last edited by HP HUNTER; 03-21-2017 at 09:36 PM.

03-22-2017, 08:19 AM	#2
Alan Nyhus VIP Member Join Date: Dec 2002 Location: Lower Dakota territory Posts: 1,182 Likes: 1,074 Liked 800 Times in 237 Posts	Re: 1971 Buick 455 GS F/SA G/SA Build Nice work, as always. Those Buicks are cool. -Al __________________ "That'll never work....."

03-22-2017, 09:59 AM	#3
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 600 Likes: 18 Liked 66 Times in 37 Posts	Re: 1971 Buick 455 GS F/SA G/SA Build Looks great to me! I play with Olds and tried the trick valve seat angles and now back to 45. I think with aggressive dwell square cams it leads to uncontrollable high gear problems, I even tried 250 on the seat. Also going back to cast iron guides, have learned bronze has different expansion rates and will tighten down. Good luck! __________________ 72 cutlass

03-22-2017, 03:11 PM	#5
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: 1971 Buick 455 GS F/SA G/SA Build Solid bronze will seize up. I had it happen on my tow vehicle. Exhaust valve got hot pulling a hill and valve started to seize and bent hitting piston. Screw-in bronzewalls or thin wall types never a problem like that. They are softer and more self lubricating. They do wear more easily though. Cast iron guides also can easily seize. I honed thinwalls and screw-ins until the valve would spin free and never had one seize. Nice pictures and work on those heads. Makes me want to go back and do that work as I did for years. __________________ Rich Biebel S/C 1479 Stock 147R

03-22-2017, 04:12 PM	#6
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 600 Likes: 18 Liked 66 Times in 37 Posts	Re: 1971 Buick 455 GS F/SA G/SA Build Solid is for alum heads only - never knew. Liners are ok __________________ 72 cutlass

03-22-2017, 06:41 PM	#7
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: 1971 Buick 455 GS F/SA G/SA Build Sold bronze will work in iron heads but they need a little more clearance on the exhaust side. I have seen many places not use seals also to let a little more oil in there on that side. After I thought about it the guide that seized on my tow vehicle was a screw-in bronze.....Only one to ever do that in my memory... I like the thin walls the best....honed to fit with a Sunnen hand hone.... __________________ Rich Biebel S/C 1479 Stock 147R