429... power....
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Junior User
Joined: Dec 2001
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From: Hewett USA
429... power....
ok.. I got my 68 429 thunderjet built and in my 78 F-150 4WD with a 4in. lift and 35s... everything in the motor is new except for the pistons.. (it was a low mileage engine) anyway.. I used a cam from summit.. it is 218 228 duration and .503 .503 lift ( not really big) and I have an offenhauser aluminum intake it is a single plane high rise and a 750 edelbrock carb. well I just dont think it has the power it should ... I mean it runs good and everything is right on it... but it doesnt have the low end torque that I think it should have it wont even spin the wheels.. its a c-6 by the way .. really it doesnt have much more power than my 77 460 except for mid to top end where it really seems to come on.. but my question is could the intake be to much for it? could that hurt the power this much down low?? I think 480 ft.lbs. should blow the tires off the rims.. ??? please help
More Turbo
Joined: Sep 2001
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From: Kelowna
429... power....
the single plane intake is hampering the bottom end performance but what is your gear ratio you will need at least 4:11 to help off set the 35".The lower the gear ratio the higher you will push your power band into the rpm range for your intake and then the cam will need to be matched for the intake and on and on we go This is something that needs to be looked at as a package not just component by component Eric
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Junior User
Joined: Dec 2001
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From: Hewett USA
429... power....
I just have a 3.50 gear.. anything else is to low for me and where I drive my truck... but with 480 lb. ft. of torque from the factory.. geezzz.. it should at least turn them over... my stock 77 460 out of a lincoln would... but I think the intake is just to much for the cam and and my driving preferences.. I would like something off of idle to about 5 grand or so... the intake I have on it now was rated to like 7500 rpm or somethin... I was just curious as to if the intake would hurt my low end this bad??
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Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
429... power....
Yep, you would make more power with the stock intake than what you have. I would recommend the Edelbrock performer. Idle to 5500 rpm range. Should make a world of difference!! 
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Joined: Apr 2002
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From: lake ariel usa
429... power....
As merc said gears would help but a decently built 429/460 makes a ton of torque which you should be able to get by with. Your biggest problem is that intake either get an edelbrock performer or weiand stealth. Before building my 460 I spent alot of time messing with the desktop dyno program and a single plane intake just destroys the torque and peak horespower of these engines. I would guess your engine combo would hit peak torque at or around 2000 rpms and peak hp at 4200-4500 and a single plane isnt doing anything under 5000.
Another thing is most folks say to run a split duration and lift by at least 10 degrees camshaft with these engines. The exhaust is so small compared to the intake ports. The results of this also show up withe the desktop dyno. Since you at least have the duration part this probably doesnt hurt much.
You dont mention headers or manifolds once again headers make a huge difference on these and most engines. But in short its the intake thats really holding you back.
Good Luck Andy
Another thing is most folks say to run a split duration and lift by at least 10 degrees camshaft with these engines. The exhaust is so small compared to the intake ports. The results of this also show up withe the desktop dyno. Since you at least have the duration part this probably doesnt hurt much.
You dont mention headers or manifolds once again headers make a huge difference on these and most engines. But in short its the intake thats really holding you back.
Good Luck Andy
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Joined: Jan 2000
Posts: 966
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From: Crooked River Ranch, OR
429... power....
Since you don't want to dump your 35" tires you'll need to change more than just your intake manifold. Your effective gear ratio with the 35 inchers is more like 2.90's-3.08's, definetly doggey gearing. You'll need to change the manifold and change your converter to a higher stall, something around 2,000-2,400 RPM. Even then you'll be marginal on having a tire-smoker. Headers and dual exhaust would be next on the list if you do not have them already. Even 4.11's on a 35" tire is marginal...my gearing chart shows 4.56's would be equivalent to a factory 31" truck tire and factory 4.11 gearing. Deen
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Junior User
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From: Hewett USA
429... power....
thanks for the input fellows I appreciate it... also I do have a 2000 stall converter in the truck.. and I just have factory manifolds for now... but I have 2.5" pipe into 2 flowtech terminator mufflers and 2.5" tailpipes... but I was thinkin it was the intake to... im lookin into an edelbrock performer for it... but like i said I just cant afford to go any lower with the gearing on the truck.. on the interstate runnin say 65 .. the truck revs 2500 rpm.. thats about perfect for me... and like I said my old 460 was torqy off of idle.. it would spin the tires a little... its not that I want to spin the tires.. its just that i think it should with that much torque...
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Laughing Gas
Joined: Nov 2001
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From: -
429... power....
The intake is important, but I would also definately dump the stock exhaust manifolds for some long tube tri-y headers. They are designed for low end grunt, combine those with a dual plane intake, and you'll have a tire smoker all the way through till 2nd gear, 3.50's or not.
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Joined: Apr 2002
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From: lake ariel usa
429... power....
Another thing to consider is with your cam and intake swap it is nolonger the same engine I highly doubt that its making the 480 ft lbs now. Also was that flywheel or at the wheels torque?
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Junior User
Joined: Dec 2001
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From: Hewett USA
429... power....
I know its definetly not got that much torque with that intake on it now.. but that is what it was rated at stock.. 360 horse and 480 lb.ft. of torque.. but that is gross rating at the flywheel
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Joined: Feb 2000
Posts: 2,759
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From: Auburn,Al
429... power....
did you do anything to the heads? or did ya jus slap that intake and cam on there, a performer, or performer rpm intake would help alot, they are both dual plane, i run the rpm with my 460, i have power from idle to 5500
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