« previous next »
Pages: [1]

Author Topic: Pushrod hole size in 2x4 intakes  (Read 465 times)

0 Members and 1 Guest are viewing this topic.

jholmes217

  • Full Member
  • ***
  • Posts: 219
    • View Profile
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 »
Logged
Jeff
1969 Mach 1 Q code 428 Cobra Jet
4 speed, 3:50 traction lock
Olympia WA. area

jayb

  • Administrator
  • Hero Member
  • *****
  • Posts: 7426
    • View Profile
    • FE Power
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
Logged
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

  • Sr. Member
  • ****
  • Posts: 385
    • View Profile
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.
Logged
Pages: [1]
« previous next »