I would like to break in a fresh 454 on the dyno. Its running a hyd. flat tappet cam. I would also like to get the hp and torque numbers for the engine while I am there. How long do I need to run the engine with the outer springs only before I can put the inner springs in and do some pulls?
Do I just do the 20 minute 2000rpm break in, then let it cool, put the inners in, change the oil and filter and let her rip?

there ya go. back up to the top where people can read ya. :D But seriously, has anyone done this? I don't want to mess this up.

Originally posted by fourfiddyfour:
Do I just do the 20 minute 2000rpm break in, then let it cool, put the inners in, change the oil and filter and let her rip? That's what I'd do. When I broke in my cam, I did the 20 min break in and went racing the next day. Took the engine to 6500 on the first pass and it's been 7000 ever since.

on my 396 after my 20 minute break in on the complete rebuild..........i checked everthing over and shut the hood and took it out on the highway and hit the 150 hp nitrous shot..........did that a few times and ran it to 7000 rpms with ot nitrous.......engine last 5 years before i changed the combo completely.............

Originally posted by fourfiddyfour:
I would like to break in a fresh 454 on the dyno. Its running a hyd. flat tappet cam. I would also like to get the hp and torque numbers for the engine while I am there. How long do I need to run the engine with the outer springs only before I can put the inner springs in and do some pulls?
Do I just do the 20 minute 2000rpm break in, then let it cool, put the inners in, change the oil and filter and let her rip? Dennis,
Ask you dyno guy if he has some break in rockers.
Most do for chevys.
If not do the light spring thing for 20 minutes & change em graemlins/thumbsup.gif

thanks guys