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Old 05-05-2013, 08:45 PM
angrymade angrymade is offline
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68' 429 ThunderJet

Hey all,

I've got a 68' 429 ThunderJet in my LWB 66' F100. It's pretty much stock aside of carb, intake, dist., and ignition. I'd really like to throw a little hotter cam. I've been looking at a Comp Cams Thumpr cam and lifters kit with new valve springs, etc... Lift .506/.493

My curiosity is running this cam with my essentially stock heads. I do not plan on doing any kind of racing. I rarely get over 2500rpm. I would just like that nice lopey idle.

Any help would be great.

Thank you,
Jesse
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  #2  
Old 05-05-2013, 09:34 PM
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What heads do you have on it? DOVE? C9VE? or what?
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Old 05-05-2013, 10:50 PM
devconk devconk is offline
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I have a mild cam on my '68 429 with the DOVE heads and it runs fine.
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Old 05-06-2013, 09:04 PM
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F-250 WARHORSE F-250 WARHORSE is offline
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That thing should have monster torque on the bottom end with a mild cam and the high compression. I will say this: Get new valve springs atleast, and make sure you have a new timing set and new lifters, but that cam at basically 500 lift is going to be pretty mild, my 545 has a 274/286 560 something lift and it lopes, snorts, and flat rips.
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Old 05-20-2013, 01:27 PM
angrymade angrymade is offline
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Hey guys, it's been a bit since I've been able to get back to this. The heads
have what looks to be " C8VE-E " for a casting number. The 8 could be a 6 as I didn't have much light.

Anyone know much about these heads?
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Old 05-20-2013, 02:56 PM
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They're not smoggy like the D2 and D3 heads.
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Old 05-20-2013, 07:00 PM
bigdan1979f-250 bigdan1979f-250 is online now
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Angry, you have c8 head castings. To my knowledge there are no c6 casting heads. The heads are good, as they have the 75 cc chambers and the motor has a high compression ratio (around 11:1 I think). I would say for what you want the cam you selected would be a good choice for your application. I think your valve springs would be borderline on the lift as far as needing to change them out, but if you have the money to do it, I would go ahead and do it. When in doubt, ask the cam mfg if stock springs will work with their cam
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Old 06-08-2013, 08:54 PM
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429 SCORE!!!!!!

Cool!!! Sorry, posted in the wrong thread.
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Old 06-08-2013, 08:54 PM
 
 
 
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