CANTONRACER

I am looking at cams and I am interested in the GTP-6. What other cams are similar and have yielded decent power.

I called GTP and was told to run these springs if I get the GTP-6 cam.

Valve springs - CCA-977-16 double spring, something like 440lbs open.
Valve spring retainers - CCA-730-16 titanium 10 deg locks must be used.
Valve spring cups - CCA-4770-16 is this correct, I looked this up at compcams website.
Valve spring locks - CCA-611-16 10 deg locks, I run lash caps

Is this to much spring for this cam? I will be using 1.6 roller rockers.

So guys that run the GTP-6, what are you running for springs...etc...

Dr.Mudge

The GM/Crane "847" is similar.

LT4POWR

You might want to e-mail GREASE. I think he runs the GM/Crane 847 cam.

Grease

Actually he drove my car on Saturday

Jason, the only other camshafts close to the GTP6 that are used alot are the GM847 which is 234/242 and CompCams XE 236/242. I believe the GTP6 is 235/242 so all that varies between the 3 is 1° on the intake. Before going with the GM847 I had thought about the TPIS ZZ-9X which is 239/239 but the fact that I can get the GM847 for 200$ helped me make up my mind.

I use 987 springs but according to Phil I would have been better off with 985s. However with 1.5 rockers my lift is .539/.558, with 1.6 rockers your lift will be about .595 so maybe the 985s won't be enough. Hopefully someone who knows more about this stuff can step in here.

96z

Im using a cam with more lift than the GTP6 for my stroker and Im going to run 977's.

CANTONRACER

I don't want to get to much spring and not enough spring, but the right spring.

I know that Waswa's car pulls very well. I would not be surprised to see the car hit near 120 MPH. Definitely does not mess around at all.

NightTrain66

check the set up height on the 977's. I believe with "normal" set up heights they will have 160 lbs or so on the seat. I was told that you need the Comp R lifters with these springs.

I have not seen or set up any of these springs and I am just going by what I have heard so do more checking before ya take my word for it.

NightTrain66

96speed

GTP recommends 140-145lbs closed and 280-290lbs open for a GTP6 cam.

Ryan