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Old 06-29-2013, 01:05 AM
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429 Intake modifications

I am new to this forum, so I will say in advance thank you. My question is I have a 1971 ford 429 4V engine and transmission that I am installing in my short bed 1966 F100. What intake and carb set up seems to work best with these engines? It isnt going to be race truck, but a fast fun truck that might pull a small travel trailor. Any help is appreciated thanks Pete

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Old 06-29-2013, 06:15 AM
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Holly ?

Some 460 trucks came with square pattern intakes and holly 4 barrels. For pulling a trailer you probably won't be up in the RPM's. If you have the smog cam retard a new double roller timing gear-chain set straight up, stock chains loosen up after 10 to 20 K miles ,,also some distributors have adjustable vacuum advance cans, pull off the hose and use 1/8 allen to fine tune, then put the hose back on. If you have the air injector bumps inside the exhaust ports, grind them out to match pre smog port shape. The old Ford performance catalogs had a lot of info in the back section.
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Old 06-29-2013, 09:21 AM
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Old 06-29-2013, 02:20 PM
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Quote:
Originally Posted by skybolt46 View Post
I am new to this forum, so I will say in advance thank you. My question is I have a 1971 ford 429 4V engine and transmission that I am installing in my short bed 1966 F100. What intake and carb set up seems to work best with these engines? It isnt going to be race truck, but a fast fun truck that might pull a small travel trailor. Any help is appreciated thanks Pete
Hello Pete, 1971 would have been the last year of high compression motors from the factory for a while (until EFI was fully developed). These motors will not operate on today's low octane unleaded fuels without experiencing engine-destroying detonation.

Your mission is to completely disassemble the motor and change out the piston or the heads to bring static compression ratio down to ~9.25:1 to 9.50:1. Engineering a good tight squish into the motor will help also, with width not to exceed about 0.050".

As far as the intake and carb, the stock intake manifold would come closer to doing what you say you want the motor to do. Upgrade to a current production Edelbrock or Holley carburetor, 650 CFM will be a God's plenty for towing and all-around street operation. Build the motor 9.25:1 and use a camshaft with 204 to 212 degrees intake valve duration @0.050", such as a H-266-2 Crane cam....

Good low end torque, towing, good idle, daily usage, mild off road, economy, good low and mid-range torque and HP, also mild turbocharged, 2400-2800 cruise RPM, 8.5 to 10.0 compression ratio advised. (See, the 9.25:1 that I suggested is right in the middle of the range suggested by Crane engineers for use with this particular camshaft.)
Grind number H-266-2
Operating range 1400-5000
Part number 353931
Advertised duration 266/274
0.050" duration 210/218
Lobe separation angle 114 degrees
Valve timing (4) 34 48 (10)
Valve lift 0.487"/0.504"

I'm not saying to use this cam and this cam only. I'm just trying to give you an idea of a cam that would work to do what you want to do. There are thousands of cam profiles out there and the best way is to call and get a recommendation from the tech guy at the grinders place of business. (In other words, talk to the manufacturer, not the techs at Jegs or Summit).

Last edited by techinspector1; 06-29-2013 at 02:41 PM.
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Old 06-29-2013, 05:29 PM
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Stock compression could be 10.5:1. Close but with the right ignition timing, it can be tuned to run correctly but it is right on the edge. I think only the 429 CJ was that high. If it came out of a Lincoln or a big Ford, it was lower.

In any case, I would go for some Alloy heads and a decent intake. The sale of the D0VE heads on it will cover about 1/2 the cost of new cylinder heads if they are any good ( best flowing factory head ). Just about any dual plane intake will do what you want. The '71 429 will please you except at the gas pump
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Old 06-29-2013, 05:44 PM
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A good starting point would be to post the casting number off the heads you have. The alpha-number is cast into the lip of the exhaust port at the side of the head, about halfway back and will look like C8AE-A or D0VE-C.
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