<HTML><HEAD></HEAD>
<BODY dir=ltr>
<DIV dir=ltr>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV><FONT face=Verdana><FONT style="FONT-SIZE: 18pt"><EM>>>>Even with
the original 1.67" intake valves, a 0.010 deck height and a 0.040 thick head
gasket, I don't comprehend where a 0.070" minimum valve to piston clearance is
possible.<<<</EM></FONT></FONT></DIV>
<DIV> </DIV>
<DIV>I don’t know to what extent you are versed in the engine, but I’ll put this
out there and use as you see needed (no insult to your knowledge intended in my
comments).</DIV>
<DIV> </DIV>
<DIV>The valves are recessed in the combustion chamber so the total of the deck
height and the gasket in and of themselves do not determine the piston to valve
clearance (if in fact that is what you assumed???). Probably the best way to
determine the actual clearance is to:</DIV>
<DIV> </DIV>
<DIV>A. If the head is not installed remove a larger intake valve spring. Set
the head on a flat surface with the valve down, then set and zero a dial
indicator on the valve stem tip. Push the valve up and measure the
distance. Add the stated deck and gasket thickness and that gives
you the clearance. Unless you check them all there is a likelihood that not all
will be the same. Casting accuracy and seat recession from wear or prior valve
jobs can change the numbers. But, hopefully the others will be “close.”</DIV>
<DIV> </DIV>
<DIV>B. If the head is installed you can bring the piston to TDC, remove the
valve spring and do similar. There is the likelihood that carbon build-up
will give a lower number (but is the actual functional clearance). Also do not
add in the deck height or the gasket thickness as they are already present. DO
NOT crank the engine while doing this or you can drop or bend a valve. A narrow
magnet may be required to pull the valve back up. Narrow rope can be fed into
the chamber through the spark plug hole to support the valve while the spring is
reinstalled. </DIV>
<DIV> </DIV>
<DIV>Remember this gives you the total distance until a valve hits a piston so
the required clearance (0.070?) will have to be subtracted from the total
number. Also, Cams ramp up and down the lobe and may not be at its highest
lift when the piston is at TDC. Therefore it is possible that the cam lift
can be greater than the minimal clearance because the piston is not at TDC (or
near enough) when it occurs.</DIV>
<DIV> </DIV>
<DIV> People have used talc powder on clay on top of the piston then
cycled the engine through a few revolutions, and measured (Calipers) the height
of the clay. Thus getting an “active” rather than a theoretical valve
clearance. This requires assembly/unassembly to measure and a very light
spring so as not to collapse the lifter (if hydraulic). Also consider that
advancing/retarding the cam from the centerline will also alter these “active”
clearances. Lastly, the valve stem to rocker tip clearance (mechanical lifter –
if used) will create additional clearance.</DIV>
<DIV> </DIV>
<DIV>I hope there is something you can glean from this and I haven’t created any
confusion. </DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV style="FONT: 10pt tahoma">
<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net">Rob Hogan via Tigers</A> </DIV>
<DIV><B>Sent:</B> Friday, April 22, 2016 9:17 PM</DIV>
<DIV><B>To:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net">Tiger's List</A> </DIV>
<DIV><B>Subject:</B> [Tigers] Stock 260 Engine Maximum Cam
Lift</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV dir=ltr>
<DIV class=gmail_default
style="FONT-SIZE: large; FONT-FAMILY: verdana,sans-serif">Does anyone have
experience using a hydraulic lifter camshaft with a lift greater than 0.440
(Clymer book page 41 maximum) in the flat top piston stock 260 cu. in.
engine?</DIV>
<DIV class=gmail_default
style="FONT-SIZE: large; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: large; FONT-FAMILY: verdana,sans-serif">Even with the original
1.67" intake valves, a 0.010 deck height and a 0.040 thick head gasket, I don't
comprehend where a 0.070" minimum valve to piston clearance is possible.</DIV>
<DIV class=gmail_default
style="FONT-SIZE: large; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: large; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV>
<DIV class=gmail_signature>
<DIV dir=ltr>Rob
Hogan<BR></DIV></DIV></DIV></DIV></DIV></DIV></DIV></BODY></HTML>