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FE Power Forums => FE Technical Forum => Topic started by: jholmes217 on June 16, 2023, 12:44:14 PM

Title: Pushrod hole size in 2x4 intakes
Post by: jholmes217 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.

Title: Re: Pushrod hole size in 2x4 intakes
Post by: jayb 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

Title: Re: Pushrod hole size in 2x4 intakes
Post by: cleandan 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.