Has anybody played around with different spring pressures for the Rev Kits available? What is the installed height on a standard deck height LT1 block with the AFR HydraRev installed? The LT1 block shares the deck height with the standard 350, doesn't it? 9.025"

 

Dont know but what I do know is that with big cams the hydra rev kit doesn't have constant contact on the lifter body because the base circle is so small the lifter falls below the Revkit's lifter guide plates, so the lifter comes up, hits the hydra rev spring & then keeps in contact until it goes down again, when its all the way down, the spring is no longer contacting the lifter again, I wonder what negative effect that has on everything, noiser is for sure, dunno what else though, prolly nothing except noisy.

 

I looked at my REV kit since the motor is on the stand right now and I don't know how big of a cam causes what your say'n but I'm at .640 lift and the REV kit springs have "preload on lifter" while on the lobe base?
..oh thats probley due to the deck being cut down to 9.003 and the heads shaved down to get the chambers at 52cc...
...compression is your friend

I did talk to AFR before purchase to confirm the springs used in the kit were fine for the lift I run and the tech guy said good to .700+ lift numbers and I thought he said the springs were 165 pounds??

 

Ok no thats not what I mean, if you take one of the lifter guides that comes with the REV KIT, put say both lifter on say number 1 all the way down so the lifters are now on the base circle of the cam, put the lifter guide on & see how far down the lifter is, now look on the guide where the spring would sit, I bet the lifter goes below that, meaning that when installed, the lifter when all the way down has no preload from the REV KIT at all.

 

Um
I did say lobe "base" not nose, and no the spring is not "loose" as in "relaxed" in manor when on the base.
How "loose" are yours?
Now i have knocked off a major amout of deck material from both sides of the head gasket [block,heads].
I'd have to say thats why mine are the way they are.
How old are your springs? could they be colapsed possibly, or do they measure correctly at the free lenght?
Just wondering if you are have issues with excessive knock activity thats unexplanable [sp?]

 

Last year when I had one and running .610 lift on a decked block,The only problem I had was the springs would flex(bend) and dig into the alum bar and put metal in the engine. I don't know if they changed the design but the bar went to the head and the spring set on top of the lifter like a normal rev kit.There was nothing between the lifter and location plate but a spring.If you rolled the engine over the spring would try to "c" shape and dig one side into the plate,sheading metal.The spring length was fine on the heel of the base circle.
If you have the heads on trying to install the plate bring your lunch---- untill you get one side in and learn how it goes--- and look out for busted knuckles.

 

I can assure you its not fine & you guys just don't know what I'm talking about but whatever, I've worked with many different cams, & any descent size cam had this problem, the spring length is fine but the lifter guide plates are too thick, the spring of the hydra rev rests on a certain area of those plates, well where it rests, the lifter goes below that, when the lifter is on the base circle there would be no contact between the spring & lifter, the spring would still sit there because its resting on the plate, but then the lifter comes up & hits the spring & starts compressing it. If you put the lifter guide on the lifters when they are all the way down & look where the spring sits on the lifter guide you will notice that the lifter falls below it, only way to fix that issue is to cut the guides down but you have to have good equipnment to make sure the guides are flat when done.

 

Do you have a small base circle cam? If you do and the lifters are going below the dog bone plates it is TOO small a circle for that engine.
There is no other way for the lifters to get below that lock plate,unless the lifters have been changed and they are too short or the base circle is to small.
To run a cam or lifters like that you would have to make the lifter bores shorter by milling them$$$$
The only whay to cut them down is the machine shop if they have the tooling to do it. I have never seen a cam drop the lifter in the hole that far without being smaller than a .950 base circle.

EDITid you get a hyd roller conversion set up for an early non roller block? If you did the lifters are to short for a factory roller block.Compare the length to a factory late model roller and see. If that's it, just change lifter's.

 

Again you have no idea what I'm saying, the lifter are not going below the lifter plates, there is a section in the lifter plates where the spring will not go down any firther, about 1/16th of the way down the plate, the plate very much covers the lifters no problem but the spring on the hydra rev won't go down that far. man bah.

 

All the lifter plates( dog bone) I have seen are FLAT. The lifters never even get flush with the plate on the top side,so I don't know what kind of set up you have.

 

Well the spring on the hydra rev does not go all the way down the plate, it sits about 1/16th of the way down the plate, most lifters on desent sized cams sit below 1/16th of the way down the lifter plate, mine sit about 50% down the plate, just missing the spring. Look at it & you'll see.