Hey I heard of this hydrarev kit for LT1's. I'm thinking this would be good for my buddies car. Could you run a hydrarev kit, and stock springs, with an aftermarket cam? That would be great, cause getting the stock valve springs would be a bitch.

 

hydra rev only applies more pressure on the lifter so you decrease chances of valve float. if your friend gets a cam...he will still need better springs b/c of the higher lift otherwise he will get coil bind. IMO hydra rev is not necessary if you get the appropriate valve springs to handle the cam.

 

With high spring rates you can and most likely will collapse the lifter with high rpm's, thats why they use a rev kit.

Its a good idea if your running like 6300-7000rpm with a Hyrdaulic roller cam, but change your springs to the appropriate ones that match your cam.

 

a hydra rev will do nothing to prevent a collapsed lifter.

 

Oh well Would have been a lot easier.
So WTF is the point of buying a hydrarev kit?

 

That's the whole point of a hydra-rev. It adds it spring pressure to the lifter body, not the plunger. It adds about 30lb closed and 50 lbs open that the plunger does not see, just the body of the lifter.

 

yes that is true for weaker springs, however, the reason somebody would collapse a lifter is b/c their springs are too strong. whether you have a hydra rev or not... you will collapse a lifter with springs that are outside the limits of the lifter.

hydra rev is a scam. when you get the proper valvetrain parts then you have no need for one. i think its mainly for those who want to run a weak spring but dont want high RPM valve float. though that doesnt make much sense to me b/c buying the correct parts is still cheaper than buying a hydra rev.

 

I agree completly, to high of spring pressure well collaspe the lifter

Quote:

hydra rev is a scam. when you get the proper valvetrain parts then you have no need for one. i think its mainly for those who want to run a weak spring but dont want high RPM valve float. though that doesnt make much sense to me b/c buying the correct parts is still cheaper than buying a hydra rev.

We could argue this for ever I feel the extra fifty lbs of open pressure that the hydra-rev applies to the lifter body goes a long ways to offer high rpm stability. I don't buy afr's hp increase. A lot depends on cam profile, a cam that peaks at say 6400 well benifit more than one that peaks at 5800. I'm running Crower 68390-3 springs with 120 seat and 355 open, I think much more than that well collapse a lifter. With the hydra-rev, the lifter body has 150 closed and 400+ over the nose. That's near soild roller #'s.

 

How about the Comp Cams "R" series lifter? How much spring pressure will they hold?

Jody J.