Where can I go to get a 3.9 or similar in good condition, what is involved in doing one of these. I have a guy who rebuilt my mk1 escort diff, he used siny shims to get the load and preload spot on.
Is the same normally required on these american cars?
Even lightened Hemi pistons are still really heavy; when you calculate how many times they go up, stop, and go down per second at even 4000rpm it is really scary. No wonder they go off with a bang......
Aftermarket blocks but I used to shift at 7600rpm and go thru the traps at 8200rpm with the belvedere with 28inch tyres, and shifted at 7600rpm and went thru the traps at 8000rpm in the roadrunner with 32inch tyres, both 4.56 gears
Pete wrote:It can be done but you wonder for how long.
Even lightened Hemi pistons are still really heavy; when you calculate how many times they go up, stop, and go down per second at even 4000rpm it is really scary. No wonder they go off with a bang......
I didn't like that 9.96 run.......7300 trap rpm with 1100 gram 6pk pistons and rods that weighed a ton...balanced assembly and external oiling or not....only did it the once...4.88's with 32's, a race converter 600hp is not good for 6pk engines.....apparently that engine is still running in a pop.
Les
Last edited by Les Szabo on Fri Jan 10, 14 8:29 pm, edited 1 time in total.
I find 29" tall tyres and 4.10 gears are acceptable on the street. Much less than that and you tend to keep looking for that extra gear you haven't got...
exactly what I was thinking, unless you're planning long road trips, I wouldn't bother or switch to tall tyres, as Pete says.
