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HP HUNTER · 03-22-2017, 08:45 PM

Thanks for the nice comments. Lets talk about valve guides and valve jobs. These particular heads utilize bronze knock in guides, the guides are bought with the ID .370 (undersize) the guides are installed which distorts the ID, I then cut a carbon relief slot in the bottom of the exhaust guide with a .450 reamer .125 deep. I use carbide core drills (similiar to a K Line core drill) which I had made, the guide is drilled to .3715 making it strait and round, the guide is then honed to final size with a Sunnen hone with Sunnen hone oil. You now have a perfectly round and strait guide, which allows you to cut a perfect seat. A perfect contact patch on the seat allows you to transfer the heat in the valve to the valve seat.

Rich.....I know you like this stuff, ck out this link

http://www.chevelles.com/forums/13-p...-pictures.html

Look closely at the valve contact patch (lap lines)

03-22-2017, 08:45 PM	#59
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 656 Likes: 82 Liked 373 Times in 129 Posts	Re: 1971 Buick 455 GS F/SA G/SA Build Thanks for the nice comments. Lets talk about valve guides and valve jobs. These particular heads utilize bronze knock in guides, the guides are bought with the ID .370 (undersize) the guides are installed which distorts the ID, I then cut a carbon relief slot in the bottom of the exhaust guide with a .450 reamer .125 deep. I use carbide core drills (similiar to a K Line core drill) which I had made, the guide is drilled to .3715 making it strait and round, the guide is then honed to final size with a Sunnen hone with Sunnen hone oil. You now have a perfectly round and strait guide, which allows you to cut a perfect seat. A perfect contact patch on the seat allows you to transfer the heat in the valve to the valve seat. Rich.....I know you like this stuff, ck out this link http://www.chevelles.com/forums/13-p...-pictures.html Look closely at the valve contact patch (lap lines)