Stage II cam questions...

[BLACK MAGIC RACING]

I have a stage 2, 274 off-center 4.1 block, 274 c.i.d. Champion gn 1's, pt-70gtq, 95 lb injectors. just waiting for some time off to go to jack cotton's for the FAST install. in the meantime, using a t-plus with extender extreme chip. the cam is a hyd. roller, 218-212. i'm thinking this is a bit small for a big cube engine... as the motor only pulls to about 6000rpm. is the cam in this block the same as a 109? are there specific cams for on and off center? would the stage 2 cams listed on comp cam's website work? or would they be too big? the smallest one is a 264-268, 650 lift. any suggestions would be appreciated.

 

[TurboTR]

No the S2 heads ones will not work; The S2 heads app has different port placement and thus different lobe ordering. Yes the cam is probably way too small really, but depending entirely on your personal goals of course

Even if this is mostly a streeter, I would still rec at least a ~ 230'ish duration cam for it.

TurboTR

 

[BLACK MAGIC RACING]

any idea where i can get a wider cam selection? if i have stock config. heads (GN1's) cams are the same as a 109?

 

[gnxtc2]

I think you are reading the Comp catalog wrong. If you looking for a hyd roller just go to hyd roller lobe spec section. I use pg 243 in the lastest catalog for the cam lobe specs. You just call up Comp and tell them you want lobe number ground for a Buick Turbo V6. Even though it says small block, the cam is ground for your engine type.

I'm assembling my 109 block with lobe number 3192.

Hope this helps.

Billy T.
gnxtc2@aol.com

 

[BLACK MAGIC RACING]

so does that mean that a stage 2 cam will fit either a stage 2 on OR off-center with stage 2 heads?

 

[Otto J]

Stage 2 cam fits on or off center with stage 2 heads
THe difference in cams is because of the different valve
location on stage 2 heads

 

[BLACK MAGIC RACING]

Thanx 4 the reply Otto, I was kinda kickin myself for asking such an obvious question... Is there any special machining required to install a stage 2 cam?

 

[KendallF]

To answer your earlier question, yes, if you have production style (GN1) heads, you can use the same cams you'd use in a stock block, including the hydraulic rollers. Call up Comp and order what you like, lots of choices.

You can't use a solid roller intended for a S2 headed motor unless you switch heads, which I assume isn't what you're after.

 

[Otto J]

I believe the same maching as a billet roller for production heads.

 

[BLACK MAGIC RACING]

What about SII heads/cam? any special machining?

 

[Otto J]

I dont believe so. The machine work would be to the nose (front section of the cam) but that machining depends on the cam retention hardware used.So the same work that is needed in a stock block to the cam is needed.

 

[KendallF]

What about SII heads/cam? any special machining?

Like Otto says, just depends on the retention system. More to the point, however, the S2 heads require a different intake, headers, valve train, etc. etc. Basically you'd be building a whole new combination.

 

[BLACK MAGIC RACING]

Yeah, i have almost everything now, only missing headers, a cam, and fuel rails.

 

[Otto J]

Get ahold of Cal Hartline, I believe he has a new set being finished as we speak