Competition Stock Long Block RPM Limits??

[Highfinance97]

What have we found out the RPM limits to be on our trucks??

be it a 12Valve or even a 24Valve

When do they start to come apart or when do the valves start to float???


Michael

 

[Wiredawg]

Just throwing a dart at it... anything above redline is dependent upon each individual engine. Then, how many times can you run it at max RPM before it flies apart?



Sorry I'm speculating on you... just think when you run over redline, you're gambling. I'm sure some racers can give you a good idea. It'll be interesting to see range of answers you get.



Wiredawg

 

[zstroken]

Pretty reliable source tells me that there was a 99 stock bottom end hitting 6K leaving the line. The 12V seem to float the valves pretty early. Haisly sells a kit(springs, keepers, and retainers) that they say is good for over 5000.

 

[TCluff]

What have we found out the RPM limits to be on our trucks??



be it a 12Valve or even a 24Valve



When do they start to come apart or when do the valves start to float???





Michael

I THINK STOCK CAMS LIKE TO SNAP AT ABOUT 4300-4500 RPM, VALVE FLOAT DEPENDS ON CONDITION OF SPRINGS AND BOOST LEVELS

 

[DRadzierez]

Michelle's truck spun well into the 5000 rpm range for 2 seasons with stock 12v

(96) bottem end and cam for 2 seasons and never came apart.

 

[Highfinance97]

Dave what about the Valve train???

60LB. springs should be good right??

Michael

 

[cahammer]

the highest is right before it comes apart i have been running 4k-4300 rpms for the last 2 pulling seasons on a complete stock block with 165k on the ticker i know i am running a ticking time bomb i just keep thinking i have more time on the clock

 

[DRadzierez]

Dave what about the Valve train???



60LB. springs should be good right??



Michael

I had good valve train in her truck.

 

[JGheen]

I had good valve train in her truck.

Could you be more descriptive on this Dave? I take it there are better, stronger springs out there for the 12v than the 60lbs. springs??



Joe

 

[TCluff]

F-1 has some 93 pounders!