I purchased a set of "completely rebuilt" cylinder heads - a '66 462 casting and a 67 291 casting. I've Cc'd these heads and all combustion chambers are within 2 CC's of one another. They have had 2.02 installed, the intake valve has been unshrouded, new springs, quality undercut valves, screw in rocker studs, and they have a mild port job - all very professionally done.
I get the set and am very pleased by the exterior work - as soon as a pull a valve, my happiness goes away as I see that the valve guides have been knurled. I had a friend look at these and he says they might be what's called "interrupted spiral" guides - not knurled.
I did a quick search and see K-line liners offer interrupted spiral but what I have are cast iron inserts, not liners. What I thought was knurling starts at the top of the guide and continues all the way through the guide except for the bottom 3/4" or so. That bottom 3/4" or so lools like a plain old guide.
The heads appear to be very nicely done (and I don't want to spend any more $$) so I find it hard to believe someone would put a bunch of money into heads and get the guides knurled.
Have any any you guys ever seen "interrupted spiral" thick walled inserts? Comments?
here's a shot of the top of the guide:
Thanks,
Brian
p.s. sorry for the large photo
I get the set and am very pleased by the exterior work - as soon as a pull a valve, my happiness goes away as I see that the valve guides have been knurled. I had a friend look at these and he says they might be what's called "interrupted spiral" guides - not knurled.
I did a quick search and see K-line liners offer interrupted spiral but what I have are cast iron inserts, not liners. What I thought was knurling starts at the top of the guide and continues all the way through the guide except for the bottom 3/4" or so. That bottom 3/4" or so lools like a plain old guide.
The heads appear to be very nicely done (and I don't want to spend any more $$) so I find it hard to believe someone would put a bunch of money into heads and get the guides knurled.
Have any any you guys ever seen "interrupted spiral" thick walled inserts? Comments?
here's a shot of the top of the guide:
Thanks,
Brian
p.s. sorry for the large photo
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