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Cliff,
After I milled my TR4A head .060", I realized a previous owner had already =
done the same. =C2=A0It was .120" total.Same problem with pinging and limit=
ed advance.
The solution was to install two copper head gaskets and use 93 Octane fuel.=
This worked great for years, until I had a chance to buy another head and g=
o back to one head gasket.
If your pushrods are too long, consider shimming the rocker shaft under the=
pedestals. =C2=A0Make sure one shim has a hole for the oil entering the re=
ar pedestal!
Try .010" first. =C2=A0Resurfacing the rocker tips would be a good idea if =
they are dimpled. =C2=A0Observe the rocker tips as they sweep across the va=
lve stems through each valve's complete lift.The geometry can easily be mes=
sed up with=C2=A0accellerated=C2=A0wear on the guides.Don't even bother ask=
ing how I know this.
Best wishes,George=C2=A0Haynes
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<div style="color:black;font: 10pt arial;">Cliff,
<div><br>
</div>
<div>After I milled my TR4A head .060", I realized a previous owner had already
done the same. It was .120" total.</div>
<div>Same problem with pinging and limited advance.<br>
<span></span>
<div><br>
</div>
<div>The solution was to install two copper head gaskets and use 93 Octane
fuel.</div>
<div>This worked great for years, until I had a chance to buy another head and
go back to one head gasket.</div>
<div><br>
</div>
<div>If your pushrods are too long, consider shimming the rocker shaft under
the pedestals. </div>
<div><span style="font-size: 10pt; background-color: transparent;">Make sure
one shim has a hole for the oil entering the rear pedestal!</span></div>
<div><span style="font-size: 10pt; background-color: transparent;"><br>
</span></div>
<div>Try .010" first. Resurfacing the rocker tips would be a good idea if
they are dimpled. </div>
<div><span style="font-size: 10pt; background-color: transparent;">Observe the
rocker tips as they sweep across the valve stems through each valve's complete
lift.</span></div>
</div>
<div><span style="background-color: transparent;"><font size="2">The geometry
can easily be messed up with </font>accellerated<font size="2"> wear
on the guides.</font></span></div>
<div><span style="font-size: 10pt; background-color: transparent;">Don't even
bother asking how I know this.</span><br>
</div>
<div><span style="font-size: 10pt; background-color: transparent;"><br>
</span></div>
<div><span style="font-size: 10pt; background-color: transparent;">Best
wishes,</span></div>
<div><span style="font-size: 10pt; background-color:
transparent;">George </span>Haynes</div>
</div>
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