Give a thought to what you want to use the car for before spending a ton of
money and/or effort on building an engine that is impressive to talk about
but a real pain in the patootie to drive. Your "big cam" will indeed open up
the revs but you will likely lose a bunch of torque at the bottom end. It's
hard to be unobtrusive at the stoplight when you need 2500 RPM or so before
engaging the clutch.
When I built my series 2 engine 15 years ago, I included a "mild" cam
upgrade. I've had it up to 7000 or better. The tach only reads to 6000, but
the needle was well past that _and_ the direction indicator light. I've had
some valve clatter ever since but it still runs. It's a lot of fun on twisty
mountain roads, but no fun in city traffic. My last Tiger was set up by the
previous owner for drag racing. He had put a ton of money into tweaking it
for that purpose. As a road car, it sucked!
I have been told that the early 3 bearing engines will take more abuse than
the 1725 with 5 bearings. That flies in the face of logic as I understand
it, but it is what I have been told by several people with experience with
both.
Anyhow, whatever you do - give serious thought to how you want to use the
finished product.
"Ole" B9104912, A3014397, A3013162
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