Making the power will not be a issue...spinning to 6k at that power you better have drives standing by to change like spark plugs ! I would go with a hyd roller and lower the max RPM and shoot for 5500-5600 max, it will make a big differnce when come to keeping drives together....Rob

The nice thing about using a shaft mount style rocker system is that it will also eliminate the need of a stud girdle or a rev kit and of course pushrod guide plates. I have always been told that the weakest link on a BBChevy is the valve train---especially with a stud mount rocker arm system.

By the way, RMBuilder/Bob Madara also designed the cams for my 565cid N/A engines about 4 years ago. There were some special things I asked Bob to do with my cams concerning idling quality..i.e. shifting, drivability, etc, and I am very pleased with the turnout.

RMBuilder/Bob Madara Marine Kinetics N.Y. 585-654-8583

I remember reading where Bob Teague had said that he had seen some guys running the Bravo drives to around 6000rpm with good luck, but never experienced it for myself. I think he was talking about when the racers ran the pre XR era drives and they were trying to make them last. My thoughts were if it could turn that high, I could keep the torque down and save drives. Am I wrong to believe that a late model xr can handle the RPM?

It will handle it, but for how long, who knows. It might last 30 mins, 30hrs or 230hrs. My bet would be somehwhere in the 100hr range if you are very nice to it.

I have allways read that the Bravo would rather spin to a higher RPM, than be lugged down with a bigger prop.

I have never tested this out, but how did this thread get off track? Did a cam ever get ordered? I would like to see what the specs were on that.

I am going to call bob and talk to him about what he thinks. Teague recommends a HR custom grind that have it is

258 - 266 duration
.647 - .647 gross lift
lobe sep. 114

Operating range to 7000RPM

They did tell me this went into their large cube N.A. motor and that they stay away from the SR only because they have to warranty their motors and have no control of the end user.

I am not yet at all convinced by Teague's guy on the cam recommendation, I am going to talk to Bob Madara before doing anything else

Formula spoke to RM@ Bob on friday and he was walkin out the door and heading to PRI @ Orlando till Dec 15th ,if you cant get ahold of him ... :ernaehrung004:

I'd wait for Bob,you'll be glad you did

Thanks

I've got nothing but time until next spring!!

Bravo vs RPM
 

I have used bravos at 7600 RPM 613 hp with small blocks in our old B class boat. My experience is torque killls them not rpm.
Steve

thanks steve