Performance Camshaft

[TurboGTU]

I was looking at this cam for better proformance. I was looking for a good lobe seperation like 112-114 for the turbo engine. Too litle like 110 will leak some boost out the exhaust. The duration was one factor too. I was looking at duration at .050 as a true means of it potatial. Ever noticed all 260 profiles don't have the same duration at .050. This one seemed right with the power rage for the automatic that I have. The bigger stick after this one would seem right for you guys running five speeds, but we all know turbos make low rpm cams seem like higher reving ones. No need for radical 290+ solid cams unless you like all the power at a short and high rpm range. This one seemed right with the lift too. No need for super stiff, quadruple, or special springs.I was also looking for a good split pattern. We all know forced induction engines want more exhaust timming than the intake to evacuate those chambers of used fuel and pressure. I was looking at comp cams but theres no split pattern or a good lobe sepperation. Other ones seemed questionable like Super stock industries. This one stated that it would work for mild turbocharged applications and seeme right. I would want to test this cam out on the rebuilt engine. Any of you guys ever ran this cam? How about Jeff? I think we should consider a good performance cam for replacement on these engines. Here is the cam I was looking at.





Crane Cams

Good idle, daily usage and off road, towing, economy, also mild turbocharged, 2200-3000 cruise RPM, 8.0 to 9.5 compression ratio advised. Basic RPM 1500-4500  

PowerMax H-260-2
replacing: HMV-260-2

Cam Specifications


Degrees Duration @ .050 Int./Exh.204/216
Degrees Advertised Duration Int./Exh.260/272
Degree Lobe Separation 112
Gross Lift Int./Exh. 427/454

Any suggestions?

[skalor]

We talked about this quite a bit on the other TGP board.  We never really came to any good conclusions about it though, but here are some links for the threads:

http://www.w-body.com/forum/viewtopic.php?t=856&highlight=cam
http://www.w-body.com/forum/viewtopic.php?t=936&highlight=cam

We were usually solely talking about lobe separation, and I think that the cam you listed, which has been talked about many times before seems to be a very good canidate.  Plus, it's only $97 for the cam/lifters from GMpartsdirect.com, but Jeff M said that it would cause computers troubles so that's why I'm staying away from it for right now.  I have enough troubles with my tranny than to mess around with trying to get it to run right.  Anyhow, I think you are on the right track.

I believe we talked before on GMpowertalk.com,  you have a turbo 2.8 with a TGP setup, and I was the one that replied with the TGP :)

[TurboGTU]

Yea.. I was checking out those forums before on the W-body/TGP forums for insight as all TGP sites. You all were talking about a good replacement cam but was undecited becouse of possible smog checks or something like that. But we know forced induction engines can pass smog test better than N/A engines. Lobe sepperation is the smog secret. Too little like 110 or 109 (too much overlap) will send unspent gasses out the exhaust. ROCK-N-ROLL
Rocker arms were another issue. Replace the cam or just change the rocker arms was another subject on the matter. I would want to change to roller rockers not just roller tip. but was thinking of coil bind and stress to the springs with high ratio rockers. But I think I wont go into that problem with good 1:6 ration rockers. but the pushrod? how close will it be to the stud sinch it will be closer to it to aid in lift. WIll the guides need modifying? well Ill stick to the bumpstick. And beg to tunnning greats like Jeff to make a chip for it. If not I'll go crazy tunning it myself. :crazyeyes:
but will manage to get it running right or close to right. Dammit I want an even HP to TQ ratio.
Yep I am Bad63pu.
By the way, I blew that 3.8 on the 63 Chevy pu. THey dont like revves or N2O(100shot). A supper charged 350 will take its place with fast burn heads.