Bob;
I just completed a rebuild of my '74 after blowing the head gasket on a
road trip a hundred miles from home... I got the car towed and began work
immediately. I went with a Goodparts GP2 cam -- a little spicier than a
stock cam but very useable for the street. Had my head milled to flat (.009
shaved by the local machine shop). CR is now 9.75:1. Replaced the thrust
washers (+0.005), connecting rod bearings, pushrods (one was bent from "the
event"), tappets (one shattered) and +0.020 piston rings (last item from
BPNW). My compression was pretty low beforehand, too, so I felt this was
the time to re-ring. Be careful with your bore measurements and compression
ring gaps (Bentley's specifies the gaps for each ring on pg. 101). Measure
the gaps of top and second rings carefully (pg. 99). Cam bearings may be a
good idea though not really necessary -- but you'll need to pull the engine
to line bore the block for them to do that. I have no cam bearings and did
all my work with the block still in the car. Bentley's has some good
instructions but patience and a sense of humor make the job easier. You'll
need a piston ring compressor and perhaps a cylinder hone attachment for
your drill if your cylinder walls are "glazed." Timing the crank with the
cam you'll also need a degree wheel and a dial indicator. Good luck, Bob!
Keep us posted on your progress.
I'd heartily recommend Rick Patton's Throttle Body Injection (TBI) so you
won't have to ever worry about those carbs and diaphragms again (
http://www.pattonmachine.com). NFI.... Just a very satisfied customer
Dave Friedlander
'74 Six with TBI and A-type OD
On Sun, Nov 3, 2013 at 5:08 PM, Bob Rochlin <r_rochlin@hotmail.com> wrote:
> Hi List, I'm contemplating rebuilding the engine of my 72' TR6 this
> winter. I am hoping the collective experience of the list can give me some
> guidance as to some of the decisions I'll have to make. I'm thinking of
> getting a cam just a little hotter then stock and shaving the head just a
> bit.
> I've been very happy with the performance of the original ZS carburetors
> and
> wonder of they are able to supply the increased fuel demands of the new
> set
> up. As far as I understand the jets are fixed. Speaking of cams, how
> necessary are cam bearings? Should I have them installed while I'm doing
> the
> rebuild? The engine runs very well, but bit doggie. I don't think that
> it's
> ever had any machine shop work done. I did a compression test about a year
> ago. The results were low of 85, hight of 120. A leak down test confirmed
> that almost all the lost compression was through the rings. The car burns
> almost no oil (it just leaks out a little) what other components should I
> replace as a matter of course during the rebuild? Anything I should look
> out
> for? I am long forward to hearing your advice. Take care. Bob
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