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cam lift question #246383 03/08/09 12:23 AM 03/08/09 12:23 AM
Joined: Apr 2007 Posts: 160 connecticut 6 69charger R/T OP member
69charger R/T OP member 6 Joined: Apr 2007 Posts: 160 connecticut	How much cam lift can you have on 440 906 heads with out doing any machining to the valve guides. I want to get a lunati voodoo cam it has 494/513 lift, will I have enough valve retainer to valve guide clearance on stock 906 heads. I will be using stock stamped rockers.

Re: cam lift question [Re: 69charger R/T] #246384 03/08/09 01:00 AM 03/08/09 01:00 AM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL Senior Member of the Junior Dragster Club
WILD BILL Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	Not sure if this will help as I don;t recall the casting # of the heads but I did have a 525 hyd cam w/ my old iron heads. They were built for a different combo so I doubt any special work was done but it was almost 10 yrs ago.

Re: cam lift question [Re: WILD BILL] #246385 03/08/09 03:35 AM 03/08/09 03:35 AM
Joined: Nov 2004 Posts: 2,495 Oregon City, OR Baxter61 top fuel
Baxter61 top fuel Joined: Nov 2004 Posts: 2,495 Oregon City, OR	you need to double check before final assembly, but you can usually get away with almost .550 lift before you have clearance issues.

Re: cam lift question [Re: 69charger R/T] #246386 03/08/09 03:47 AM 03/08/09 03:47 AM
Joined: Feb 2008 Posts: 110 Idaho.U.S. J jeffs440 member
jeffs440 member J Joined: Feb 2008 Posts: 110 Idaho.U.S.	Well I think the rule of thumb is not to go over 500 lift with stock rockers without going with ajustable rockers but I do have a XE284 with 510 lift cam in my 69 charger 500. It has stealth heads with stock rockers and 9.1 compression and runs great. Runs 3.90's at 98 but I need slicks. Jeff

Re: cam lift question [Re: Baxter61] #246387 03/08/09 09:18 PM 03/08/09 09:18 PM
Joined: Apr 2007 Posts: 160 connecticut 6 69charger R/T OP member
69charger R/T OP member 6 Joined: Apr 2007 Posts: 160 connecticut	Quote: you need to double check before final assembly, but you can usually get away with almost .550 lift before you have clearance issues. I thought I read some where that .510 lift was the most you could go with out guide to retainer clearance problems, also read .480 was the most. I like the lunati .494/.513 268 cam, but I don't want to have to shorten the valve guides. If .513 is too much lift for stock 906 heads I will pick another cam with less lift. Thanks for any info

Re: cam lift question [Re: 69charger R/T] #246388 03/08/09 09:24 PM 03/08/09 09:24 PM
Joined: Dec 2004 Posts: 10,551 Rittman Ohio fourgearsavoy I Live Here
fourgearsavoy I Live Here Joined: Dec 2004 Posts: 10,551 Rittman Ohio	I have a 906 head with one broken guide and 4 others that had definite contact with the retainers with the 509 purple cam.With my next set of 452's I had my bro-in-law grind .100 off the guide on a surface grinder and that worked OK Gus 64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60

Re: cam lift question [Re: 69charger R/T] #246389 03/08/09 11:08 PM 03/08/09 11:08 PM
Joined: Jan 2003 Posts: 5,186 Wherever I am. J Junky master
Junky master J Joined: Jan 2003 Posts: 5,186 Wherever I am.	Quote: Quote: you need to double check before final assembly, but you can usually get away with almost .550 lift before you have clearance issues. I thought I read some where that .510 lift was the most you could go with out guide to retainer clearance problems, also read .480 was the most. I like the lunati .494/.513 268 cam, but I don't want to have to shorten the valve guides. If .513 is too much lift for stock 906 heads I will pick another cam with less lift. Thanks for any info The .513 lift would be with 1.5 rockers. Since you're gonna run stock stamped steel rockers, they are less than 1.5, so the .513 becomes something less. Maybe more like .500 lift, in reality? Would that be safe to run without needing to mess with the retainers? 2010 Black Challenger SE <> 3.5 V6 Custom Shift Knobs www.flameball.com Check It Out

Re: cam lift question [Re: Junky] #246390 03/09/09 07:56 AM 03/09/09 07:56 AM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Very likely would be but there is only one way to be sure. Install the valve and put the retainer on without any spring and measure the distance from the retainer to the guide with the seal in place and sea that you have for travel before it hits the guide/seal.

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