High Lift Roller Cam
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Junior User
Joined: Oct 2006
Posts: 55
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High Lift Roller Cam
Was thinking about putting a crane hyd. roller 349541 or 349521
and was wondering if it would be to much as far as the valve to
piston clearence. I have a 390 block bored .060 with 428 crank
0 decked with 10.0:1 comp. currently running a .517 int .513 exh
custom grind cam. I am planning on either the comp roller rocker setup
or the harland sharp setup for valve train stability. I also have a set
of edhock heads that I will have ported, polished, and machined to
accept the cam. I am fairly happy with the build I just am not impressed
with the mid to upper power yet. And I think the roller cams would really wake it up. Thanks for any replies in advance.
and was wondering if it would be to much as far as the valve to
piston clearence. I have a 390 block bored .060 with 428 crank
0 decked with 10.0:1 comp. currently running a .517 int .513 exh
custom grind cam. I am planning on either the comp roller rocker setup
or the harland sharp setup for valve train stability. I also have a set
of edhock heads that I will have ported, polished, and machined to
accept the cam. I am fairly happy with the build I just am not impressed
with the mid to upper power yet. And I think the roller cams would really wake it up. Thanks for any replies in advance.
Senior User
Joined: Feb 2006
Posts: 355
Likes: 1
You'll find a LOT of power by working over the Edelbrock heads. They are only the smallest bit better than a CJ head "out of the box". The bigger cam will deliver a greater gain WITH the modified heads than it would on it's own - it takes advantage of the flow improvements at higher lifts. Piston to valve should be OK with the smaller of the two - but you still need to check!
Senior User
Joined: Jul 2003
Posts: 204
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From: Montana
To get the most out of your setup, don't neglect the exhaust system. Numerous articles are agreeing on 2 1/2 of 3 inch diameter collector with a minimum length of 18 inches. They suggest up to 24 inches if more low rpm torque is preferred.
Then make a resonator at the end of the collector to produce a strong reversion wave that goes back up the header primary pipes. Do this if your running mufflers.
The resonator volume is equal to 4 cylinder volumes minimum. I believe they suggested up to 6 cylinder volumes was even better.
Then 2 1/2 inch minimum exhaust piping from resonator to mufflers.
David Vizard describes all this in one of his books (maybe in his book How to build HP). Hope this helps.
Then make a resonator at the end of the collector to produce a strong reversion wave that goes back up the header primary pipes. Do this if your running mufflers.
The resonator volume is equal to 4 cylinder volumes minimum. I believe they suggested up to 6 cylinder volumes was even better.
Then 2 1/2 inch minimum exhaust piping from resonator to mufflers.
David Vizard describes all this in one of his books (maybe in his book How to build HP). Hope this helps.
Thread Starter
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Junior User
Joined: Oct 2006
Posts: 55
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Thanks for the exhaust tips never really thought about the resonator idea before. I might have to check into that. I am currently running Hooker comp. headers with the collectors cut back to the 3in section with 3in pipe into flowmaster 40s then dumped in front of the tires.
Was wondering if their is a way to tell the max lift I can safely go without pulling the heads right now. Kinda have to keep it on the road for now. Just wanted to start planning the upgrades then start stashing parts and saving up before I tear into it.
Was wondering if their is a way to tell the max lift I can safely go without pulling the heads right now. Kinda have to keep it on the road for now. Just wanted to start planning the upgrades then start stashing parts and saving up before I tear into it.
