For A Ms3 Cammed Prc 5.3l Head Car Is What Would Be The Benefits To Adding Some Shaft Mounted 1.7 Ratio Rockers


I Ask Because I Think I Can Pick Up A Set Really Cheep But Dont Know Weather Its Worth My Time To Get Em And Install Them

??

 

I don't know what set your getting "really cheap", but I installed the Comp Cams #1500 system and I am very satisfied with the results.

The instructions are crappy though.

 

those bad boys are ugly^^^^^^ i have harland sharps and they look cool even if they didnt' help any.

 

They may be "ugly", but they are adjustable.

 

yea but can anyone say their was any gains in hp ? or significant reliablity gains? cooler oil temps?

.... anything?

 

I'm wondering the same thing. About to go with a bigger cam so I'm going back to 1.7's. Go stock or go 1.7 Shaft mounts. Someone have any more info on this subject?

 

anyone?

 

Well The big advantage is that they are ADJUSTABLE.

There is no substitute to knowing and being able to accuratly set preload.

They are rollers to boot.

Here is a test:

Set a long straight edge across the row of valve stems.

Are there any gaps, that is do some of the valve stems not come up to the edge?

If so, that gap will still exist with the same length pushrod installed.

I can show you EFI data (from my motor) that shows what a 0.010" differance in preload will do, and what happens when the thing is dialed in.

That is why I did not install a non-adjustable rolling rocker.

All of a sudden they don't look so ugly huh?

 

the benifit of shaft mounts is drivetrain stability. exactly what you need for high RPM.
they're adjustable because most guys that need them, are running solid rollers.


if they're stock ratio, and you're not doing anything to take advantage of them, you wont see any gains.. but they're almost required on a high RPM solid roller motor.

 

well said and true..

 

so for my car their not of much use????

i mean even if my valves are a bit off cant i just use differnt sized pushrods to compansate ??? and past that is there any benefit for a hydro. roller setup i dont spin past 6700 due to my stock bottom end anayways

 

the "little bit off" is compensated for by the hyd lifters.
if this was a max effort, all out, every 1/4hp is visible race motor that required a hyd cam, then you might try it, but realistically, you'll see as much gain at the track as you do when you pee before you run. (weight loss)