British Parts Northwest hardness checks their lifters. They have a
set of heavy duty tappets that are coated with something cool and are
"lightened" for less than a buck more than the stock lifters.
http://www.bpnorthwest.com/
Here's their description:
"These are Heavy Duty Tappets for a TR3-4A. They are lightened and
have an extra oil drilled in the side for extra lubrication. Every
batch of tappets are tested when they arrive from the UK. Each tappet
will have a minimum hardness of Rockwell 54. The industry standard is
50 for tappets. We have never had a bad batch of tappets like other
companies and never will because of our dedication to dealing with
only quality suppliers. "
0.480 lift is nothing to sneeze at, and will stress the valvetrain
more than the stock lift. Not a bad idea to follow the thread on good
oil, maybe add some STP red or GM's EOS on an oil change to keep the
ZDDP in the range where the valvetrain doesn't eat itself.
- Tony Drews
At 09:42 AM 5/27/2007, Stutzman wrote:
My TR4 is a fast road car, not a race car, but I do a lot of track
days at
Beaverun. Track time on a track day is as much as at a normal
vintage race
weekend. Otherwise just road use.
I wiped a couple lobes off my cam.
It is an Isky 555 with Isky springs, etc. 10 to 1 compression.
I put Richard Good's 165 roller rockers on last summer which
increased the
lift from .435 to .480. Easy installation, no coil bind,etc.
Wasn't long till #3 needed adjusted and adjusted and---
3 lifters are now concave and badly pockmarked!
Where can I get lifters that can hold up?
.480 lift is kid stuff compared to what most of you are running.
Advice solicited and happily accepted.
Bruce Stutzman
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