Jump to content

HV-12 Rebuild: Chevrolet Exhaust Valves


MNathan
 Share

Recommended Posts

 
Anyone ever followed advice in Jake Fleming's The HV-12 Rebuilding Bible related to substituting Chevrolet Exhaust Valves in their rebuild?
I have a print of the article from the LZOC and in the follow on FAQ a fellow named Les Keeton suggests that even though they are a tad longer, they are a better quality valve. He provided guidance to stem height for hydraulic lifters and 1 piece guides. I plan to use solid adjustable lifters on an isky cam.
 
The clarification I need, is that he directs one to use the "1st valve keeper groove" and references a photo that is missing from the print. As the Chevy valve has a 2 groove keeper, I am looking to his reference as "1st groove" being the top or bottom groove on the Chevy valve?
 
I guess experimenting with installed spring height and seat pressure may tell, but I need to know before that stage, as there are a lot of inexpensive performance stainless steel chevy valves with smooth stems and swirl polish to improve flow of the small V-12 ports, and most of
the performance valves only have a single keeper groove.
Edited by MNathan (see edit history)
Link to comment
Share on other sites

On my v12 I used Chevy valves that were 1.550 dia. The valve inserts will stand the bigger size. May be even let more fuel in. I had to machine a small amount off the stem

and use special valve spring lock which lowered the spring height. All this worked well with Johnson adjustable lifters and reground cam. I used the single valve groove and the valve locks I purchased at Speedway Motors.

  • Like 1
Link to comment
Share on other sites

  • 2 weeks later...

MNathan, The valve locks I used were from Speedway Motors part # 91599097. As you mentioned they were for Chevy Exhaust Valves, single groove. I forget the amount I took off the bottom of stem, but it worked out well with these valve locks.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...