[ponjohn]

Originally Posted by Steve C.

Not a pat answer but some numbers to add interest....

Comp XE hydraulic flat tappet lobe 5203

Duration at .006- 280
Duration at .020- 258
Duration at .050- 230
Duration at .200- 140
Lobe lift- 0.3200

Static duration at the valve with a 1.5 rocker ratio:
.050 lift - 244
.200 lift - 179
.400 lift - 92


Comp XE hydraulic roller cam lobe 3315

Duration at .006 - 282
Duration at .020- 257
Duration at .050- 230
Duration at .200- 151
lobe lift- 0.3400

Static duration at the valve with a 1.5 rocker ratio:
.050 lift- 243
.200 lift- 185
.400 lift - 109


.

Interesting. The roller will "hit" harder by looking at the 200 numbers.

[Steve C.]

Upgrade the valve springs


.

[Gach]

Originally Posted by scott70

Years ago my engine builder put in a 60919 that I asked for. He told me they tried degreeing it in but kept coming up with funny numbers. They checked it and it was like 116LS. They called crower and they sent another 60919 and that was still like one degree over on LS but degreed in decent. Car pulled really good to 5500.

That always made me paranoid, went through allot of BS with that venders cam. Back then not knowing what I know today. Once I move up to roller cam, not wanting to ever go through that again, I just pay small fee and have it checked.

Hyd roller cams, my brother went through kind of same deal many have, he bought his from Butler, when it wipe out, Butler made good on it but not with out allot of stress. Hopefully the new set up will be ok. But still he’s afraid to drive it..LOL

Hey you never know, it’s hard to say is it the venders fualt should they check every cam before it goes out the door?

[adeeos]

GTO is running really rough after the engine blew out freeze plugs. Had those fixed and just getting it running again. Took passenger side valve cover off and two rocker arms were sideways.

#4 Intake push rod is bent so bad it won't come out....I got the #4 exhaust push rod out (well about 3/5ths of it out with a magnet. It may be LS time. Super frustrated, looking forward to getting the intake off to see what else I see.