98 k1500 stock cam?

[Aloicious]

whats the difference between mechined and hydraulic roller tappet?

are you talking about the difference between a hydraulic roller and solid roller lifter?

Does the Hydraulic roller have a different idle than the flat tappet cam? Slower? Faster? Lopey-er?

the idle characteristics are mostly in the cam and tune, not really the lifter, for most intents and purposes you can grind a cam (along with tuning) for whatever characteristics you want regardless of lifter style. and the idle speed is in the tune and cam, different cam grinds will idle better at different RPMs, and keeping the idle at such an RPM is commanded by the PCM.

rollers will yield lower friction, and lower wear, and you are able to grind the cam lobe profiles much more agressively than a flat tappet.

 

[silverado13]

i have no idea what im asking, im starting to pick out a cam and under summitracing they have all these different options and i want to make sure im looking for the right one

 

[Aloicious]

yeah look for a hydraulic roller cam, thats what your truck uses

 

[silverado13]

whats the specs on your cam?

 

[Aloicious]

mine is a ZZ4 cam, the specs are listed in post #17 of this thread.

 

[silverado13]

is your cam to big for the stock injection?

 

[Aloicious]

as was stated earlier in this thread, the problems and limitations with a cam change are in the spring and retainer clearances NOT injection, on an otherwise stock motor you WILL NOT exceed the injector limits with only a cam change. if you do more than just a cam change then it is possible.

I do not run the stock injection though, but that is not because of the cam alone.

 

[Super Silvi 1990]

as was stated earlier in this thread, the problems and limitations with a cam change are in the spring and retainer clearances NOT injection, on an otherwise stock motor you WILL NOT exceed the injector limits with only a cam change. if you do more than just a cam change then it is possible.

I do not run the stock injection though, but that is not because of the cam alone.

Also if you go too agressive with a cam you may start to have problems with your pistons comming up to fast on your valves. like so

You must be registered for see images attach

 

[RHamill]

Ouch, I'm so scared to mess with my cam because of that kind of ****.

 

[silverado13]

ok so what all is required for a cam swap, i mean what all should i change?