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Camshaft with power brakes

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FBBO Gold Member
FBBO Gold Member
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8:48 PM
Joined
Jun 7, 2024
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Location
Oceanside Ca
Hi, I’m building a 68 charger RT. I have a 512 stroker kit from 440 source. I want to run trick flow heads and a solid roller cam. I am trying to find out what cam shaft I need to keep the vacuum up for power brakes and still have good performance. I was told this might work, 242 intake, 247 exhaust at .050 on a 110 center lobe. It will have around 10 to 10 1/2 compression. It had 10 to one compression with 440 source heads. The last engine I had in it had so much cam that the brakes would go out now and then. Or would an hydraulic cam be better? Any info I can get would be greatly appreciated. Thank you
 
It depends on what your priorities are. My 446" has 10.47:1 compression. The cam is 235* @ .050" HFT and idle vacuum is 8". Cruising vacuum at 2500 rpm is +- 15". Four wheel discs with a booster. I get one good panic stop! The second stop, unless you give it time to build vacuum (impossible to predict), takes two men and a boy to apply enough stopping power. Choices? Remove booster and go back to manual, add a vacuum motor/can or add a hydroboost, which is my next move. Can't help you with the roller as I've not used one... I really encourage you to pick a brand of cam and then talk to the people who build it.
 
coloradodave, what is your lift? Is it advanced? How much timing at idle? What is your idle speed?
 
coloradodave, what is your lift? Is it advanced? How much timing at idle? What is your idle speed?
.540" with 1.6 rockers (.507" with 1.5 rockers)
15* Initial timing at 950rpm
108* lobe center

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