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Old 09-25-2008, 17:36   #1 (permalink)
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428 Pushrods hitting intake.

Hopefully someone here knows the answer to this I have been struggling for a long time.
I have a 1967 GT 500 currently containing a 69 428 CJ motor. I have the correct original Ford dual quad intake on it. I have replaced the rockers with aluminum roller rockers with a 1.76 ratio. The problem I have is that some of the pushrods hit the holes where they go through the intake. I have discussed this with many people and everything seems okay otherwise. The pushrod length appears to be very close. All of the pushrods are very close to the sides of their holes but a few actually rub the intake. The problem is slightly worse in the rear of the engine. They rub at the "bottom" or closer to the valves than the carburetors as it were. I have included two pictures.
Although the intake is from a 428 PI and the heads and block are CJ I believe that they should have the same dimensions and so should not be a problem????
Any thoughts on this will be greatly appreciated.
Carl Schneider
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Old 09-25-2008, 17:46   #2 (permalink)
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Re: 428 Pushrods hitting intake.

Second try at uploading the pictures.
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Old 09-26-2008, 13:21   #3 (permalink)
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Re: 428 Pushrods hitting intake.

Carl, the only thing I can think of is the 428CJ and 428PI intake cast iron vs aluminum. If your push rods are 3/8" dia. the intake may require machining to allow more clearance. But if you have the 11/32" dia. your okay.
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Old 09-26-2008, 14:40   #4 (permalink)
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Re: 428 Pushrods hitting intake.

Hi Carl. The easiest way to post photos is upload them to photobucket and enter the direct link in the Insert Image option.


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Old 09-27-2008, 08:45   #5 (permalink)
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Re: 428 Pushrods hitting intake.





Last edited by tbird100636; 09-28-2008 at 19:06. Reason: Fixed Pictures
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Old 09-27-2008, 18:21   #6 (permalink)
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Re: 428 Pushrods hitting intake.

Carl, The angle from the rocker and push rod does not appear right in your picture. If you rotate the engine manually with a ratchet, they should follow the same plane. If they move away or towards the valve- something is not right.

I believe you are correct in continuing to search out this issue.

I will take that problem off of your hands. :)
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Old 09-29-2008, 08:05   #7 (permalink)
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Re: 428 Pushrods hitting intake.

Looks like those rocker arms may not have been designed to work with that intake. I wonder if there's enough metal to drill the pushrod holes oversized?
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Old 09-29-2008, 16:43   #8 (permalink)
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Re: 428 Pushrods hitting intake.

Actually the rockers are the stock ratio and so the actual measurements should be the same as original. Actually I have tried installing one stock rocker arm on one of the shafts and it shows the same problem.
I also tried a thinner (11/32") pushrod, it doesn't hit although it is still too close for comfort.
Seems like I will be removing and machining out the pushrod holes.
Thanks for the thoughts everyone!
Carl
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