QUOTE(jdlmodelt @ Dec 27 2012, 10:43 PM)
OK. So what can I do to the stock 1.7l to improve HP without all the bore upgrades? Can I put in the same displacement but slightly bump up the compression? I'm putting a 2.0l out of my 76 for now but I'm planning ahead when the 2.0l in the 76 and the 1.7l back in the 72
nice to see a colorado guy on here...
the problem with the 1.7 is that is costs just as much to rebuild it with 70hp (correctly) as it does to rebuild a 2.0 motor with 105hp.
your best economical bet would be SSI exhausts
if you really want to open the engine, then a cam and carbs
but at that point, its only 200$ more to put in the 2ltr crank and rods...
your 1.7 heads and valves are really the limiting factor
and rebuilding those with bigger heads are about the same price as rebuilding a set of 2.0 heads with bigger valves....
so stock 2.0 heads are cheaper than big valves on your cores.
for the money.. finding a running $1000 2.0 motor gives you 90 - 95 hp and costs about 1/5th the cost of rebuilding...
if you do open it up to rebuild, most people decide its worth adding the displaceemnt hp at that point for relatively the same costs...
living with a running 1.7 gives up 15-20hp but costs $5-6K less.......