Ok, even I and getting sick of posting all these idea about why my motor is not running right, but here's one more. Right now, i noticed that when it revs up and gets near 6000rpm, i feel a noticable loss of power. Now the springs recommended for my cam have 132lbs of seat pressure, but currently the springs i have are set @ 85lbs. You think that little pressure would cause valve float on a hyd flat tappet cam? Valve train is kind of heavy ( i think), PEP valves supposidly comparable to manley severe duty, PEP dual springs, scorpion aluminum roller rockers, and 4130 pushrods.

 

Yep, you're floatin' 'em. Couldn't imagine getting away with anything less than about 110lbs on the seat with that cam.

Wait till you take it up top with the proper springs. It's an "oh, wow!" kinda difference.

 

I agree with Damon.

Rich Krause

 

well.. here's what sucks.. my valves were .100 longer, when they were'nt supposed to, but my machine shop said that 85lbs would be ok, so went ahead and went with them. But at first i was saying to put them @ 135lbs, and he said he would have to put 1/4" of shims to get that. Now i can either get new springs (these are supposed to be .600 lift), or i can just put some more shims, but would 1/4" be too many shims to run 6500 rpm.

 

What is your installed height? You can shim maybe .120 or so, but not .250". You need to get a spring designed for your install height. For example, the CC950s are good for a 1.900" installed height.

-Alex

 

well, i'm not sure what the installed height is, though i guess i can check tommorow. Or, well i guess it doesn't matter, since i'm going to have to get new springs anyways.. this sucks...When i get the new springs, do i just have to set them by the height, or do i need to get a pressure tester and all tha BS, cuase i'm gonna do this my self, instead of paying the machine shop to do it. They pissed me off with this stuff and are charging me $125 to exhange some new manley severe duty valves, 8 of em just dont have a box...SOB....so f*** the machine shop.

 

There should be someone you can borrow a spring tester from, or another machine shop that can measure them for you even though you are going to install them. But yes, they should be checked.

Rich Krause

 

well.. lets say a set of springs is rated 135lbs @ 1.800, and i put shims to make them 1.800, i still have to check pressure? Does a few lbs really make that much of a difference?

 

Well, depends on your goals. The factory probably doesn't check each spring. But any high performance/race engine builder will (or should). There is such a thing as a bad or mis-boxed spring. They also can vary a lot, that's what shims are for. To me, checking the springs is basic. But do you absolutely have to? No.

Rich Krause

 

hmmm.. guess i will, if i can get a hold of a pressure checker. I am going to be doing this with the heads on the motor.. that ok?

 

You need a valve spring mic and a small spring pressure tester if you want to do it right. You can do springs with the heads on the car by ensuring the cylinder you are working on is top dead so the valve doesn't fall. The Moroso valve spring compressor works nicely.

-Alex