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Author Topic: Pushrod hole size in 2x4 intakes  (Read 466 times)

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jholmes217

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Pushrod hole size in 2x4 intakes
« on: June 16, 2023, 12:44:14 PM »
Are the pushrod holes in the Ford medium riser 2x4 intake the same size as the Blue Thunder medium riser 2x4 intake?  I have a Ford 2x4 medium riser, and I'm using a POPs roller rocker system with POPs pushrods, which are thicker than the original Ford pushrods.  Seems the holes in the Ford intake are awful small to use the POPs pushrods.
« Last Edit: June 20, 2023, 10:13:11 PM by jholmes217 »
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Jeff
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jayb

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Re: Pushrod hole size in 2x4 intakes
« Reply #1 on: June 16, 2023, 02:10:29 PM »
I didn't measure the pushrod hole diameter when I tested all the intakes, but I'm about 90% sure they are the same size, 5/8" diameter - Jay
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Jay Brown
- 1969 Mach 1, Drag Week 2005 Winner NA/BB, 511" FE (10.60s @ 129); Drag Week 2007 Runner-Up PA/BB, 490" Supercharged FE (9.35 @ 151)
- 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA (9.50s @ 143), 585" SOHC
- 1969 Shelby Clone, Drag Week 2015 Winner Modified NA (Average 8.98 @ 149), 585" SOHC

   

cleandan

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Re: Pushrod hole size in 2x4 intakes
« Reply #2 on: June 17, 2023, 09:11:34 AM »
I agree with Jay.
I have not measured the pushrod holes either, but they do appear to be 5/8".
I seem to remember the Blue Thunder intakes are machined a tiny bit larger on the valve cover side of the pushrod hole, almost as if they were beveling it just a bit to be sure the clearance is best.

The Ford intakes have a straight cut hole that is the same top to bottom.
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