Can it be spun to 7000RPM day in and day out without problems?

Thanks,

Lee

Lee, There was a guy here that ran a 502 it a fast truck that ran one all year long and turned it 7500 RPM thru the lights without any trouble.

Originally posted by 70_chevelle:
Can it be spun to 7000RPM day in and day out without problems?

Thanks,

Lee No, you cant expect to have No problems regaurdless of RPMs, and i would doubt it, depending on how seriously you race.

What kind of 502? All cast stuff with poor rod bolts? All forged everything with ARP bolts?

Originally posted by bored&stroked:
What kind of 502? All cast stuff with poor rod bolts? All forged everything with ARP bolts? Stock ZZ502 internals....

I was under the impression, that the ZZ-502 is a forged crank, pistons, & good rods.

I doubt many engines will survive for very long at sustained high rpms.
But I do remember a post in which Gary said that a ZZ-502 is a Cam, Spring, and lifter kit from 7400 rpm.

I doubt there are many people on this board (or any other) that know more on the subject.

Lee....I shift at 5500-5800 with my cam.....I would think you wont need to shift that high...I would say you might be in the mid to upper 6's.....I went faster shifting from 6500 to 5500....To test your's out though I would try a few rounds at 7000 or even a bit more then follow up with a few 6000 - 6500 .....

Scott - With the old cam I made power to 6300RPM where I had the dyno operator top out and with the new solid roller setup it should make more HP in the upper RPM's. I might take it back to the dyno and have them run it to 7000 and see where the power is on it.

BTW, I'm very surprised at your low RPM's with your cam (251/260) and the incredible track times. I sure wish we had decent air here....

What timing did your run with the stock heads vs the re-worked heads?

Lee

I guess i'd better qualify my statement about the ZZ 502. With the standard hydraulic roller the motor will probably run out of power at about 5900 RPM. If however, you put a solid roller or a solid flat tappet and the matching valve springs, retainers & keepers the forged bottom end will easily go over 7000 without trouble. I suspect it will run out of power at about 65-6800 though but the high performance rods, forged crank and all big chevy blocks are more than strong enough to live at this stress level. I've a 396-375 thats been to 8000 on dozens of occasions and has 41,000 trouble free miles on it.

Lee....Same timing with the old heads and with the new.......My car loves 40 total.....How's the project coming ??

Since Gary hasn't stopped by, to paraphrase him , yes 7000 all day long. I'm sure someone will reference the post.

Originally posted by blaauboer:
Lee....Same timing with the old heads and with the new.......My car loves 40 total.....How's the project coming ?? I got it done and went to the track and I had a few issues that I had to work out plus the air DA was really bad, the barometer was 25.40! Anyways, I figured I picked up .2 (to the 1/8, I let up at the 1000' mark) with the air but I was shifting at 5200RPM because I screwed up the shifter and didnt realize it until I got to the track. The good side is the upper RPM miss is gone. The car runs so smooth that I thought it was running slower until I got the time slip!

This cam isnt supposed to be making more power until 4500RPM and where I was shifting, it only has a little more power. This is why I was asking how far I can wind this up. DD2K shows peak HP at 6500RPM.


Thanks everyone for the comments, it really helps me out.

Lee

70_chevelle, Your cars are flying in that lousy air. Warren Johnson said of a 100 degree day at Brandimere?, near Denver, " The air was so thin that the birds were walking". I never seen a barometric reading below 28 here. Usually runs 28.6 to 29.5, acassionally hits 30.0 in fall or spring.

Lee...........Lee call me at work......Scott.

The 502 and the L78 both peak under 6K rpm. 7K rpm is just using up the engine for no gain.

Originally posted by Keith Tedford:
The 502 and the L78 both peak under 6K rpm. 7K rpm is just using up the engine for no gain. Only if they are stock.. Not too many 502's stay stock for very long! And mine is not stock....

Lee

My 375-396 really liked 6800 which was about 400 RPM over the power peak (that factory 375 H.P rating was NOT the power peak- just G.M. playing politics). It wouldn't E.T. worth a darn because of the lousy tires and an asfault starting line but did run 107.7 keeping it in third gear thru the lights. Your right about the ZZ 502 running out of RPM but not the solid lifter L78. The L78 with a good cam runs really hard. Take a look at Helms '69 Camaro "B" stocker, low 10s @ 127 MPH.