98 k1500 stock cam?

[Gary98K1500]

I've got the 5.7 vortec 350, just was wondering if I have the hydraulic roller or the flat tappet cam?

Thanks

 

[ndians68]

im not 100% sure but i think its the roller

 

[Aloicious]

you have a hydraulic roller

 

[Gary98K1500]

Thanks guys. I appreciate it, now I can move onto the heads

 

[silverado13]

whats the difference tho? im working on learning more about it

 

[Aloicious]

its all about lifters, the flat tappet lifters and flat bottomed and just sit flat on the cam lobe, the rollers have a wheel that sits on the cam lobe and rolls as the cam turns. you want to match the what kind of lifter the cam was ground for with what you're using, otherwise you might have problems, heres a picture to illustrate why you don't want to use a flat tappet lifter on a roller cam:

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[slowburb]

Roller tappet cams build up NOWHERE near the friction that flat tappet cams do, they generally require higher spring pressures, and have more aggressive lobe ramp rates/intensities.

 

[silverado13]

so i have roller in my 97 k1500?

 

[slowburb]

Yes, your engine has a small, tame roller cam in it. All of the vortec 5.7 engines are roller cam/lifter equipped.

 

[silverado13]

alright thanks, how big of a cam can the vortec fuel system handle, ive seen people throw random numbers around but i want to know a definite answer because i want to add a cam but dont want to over welm my spider poppet system