AFR Tech: How to determine proper push rod length with Alex Taylor

Good spokesperson!

Great video Alex. No nonsense and perfectly spoken. It's a welcome change for this type of information. Keep up the good work!

Well.... Im confused. By installing a longer pushrod on this all your doing is changing lifter preload, nothing to do with rocker geometry. The rockers are fixed in position unlike a conventional rocker stud. I'm either missing something or this video is almost completely useless/misleading, which coming from AFR is very disappointing. Happy to be corrected.

7.400 the lords length

Weird not hearing someone say,
"What's up,Guys"

Alex is a great spokesperson. Guys I am patiently waiting for AFR to make a head for my 440 dodge super stock clone. Hoping you guys might have something to go with Scat's stroker kits.

I'm getting ready to swap to Mongoose heads !

7.400 should be good on a stock deck LS3 ?

I have a stock genv 454 that I’m putting 71 chevelle 454 bbl heads on will stock 3/8 push rods work ?

hi
hi although pushrod length is great idea , time would be better spent on a chevy cyl head application advice . Surprisingly being heads are your main product your still giving the wrong advice for application . Multiple calls to your advice line b4 a proper calculation was done for the application
Try having a 195 comp head on 400cuin ,breathing thru a straw when should have been a 220 to rev a 400 to no more than 6500rpm .
Be cautious of the advice

Just the tip.. Am I right boys?

The information on this video doesn't apply to non adjustable rockers. Verifying the wipe pattern is part of setting up the valvetrain but on a stock rocker LS, lifter preload is the #1 reason for measuring pushrod length. Also, a tape measure to check pushrod length? A precision measurement where the tolerances are in the .005" range (depending on application) is NOT taken with a tape measure. Micrometer is best , cheap dial calipers minimum. Also, a ton of time & effort can be saved by setting the checker in place and threading it out until it sits in the rocker arm cup.

There is just a little bit of an easier way to do that how I do it is I put the push tube in there close to stock height and wrap a boot lace around it install The Rocker and then you just pull on either end of the boot case until you get all the slack out then measure it and send off for a new ones. It makes it easier than trying to get your fingers in there and it also makes it easier than taking the rocker off 50 times

"Great spokesperson" and yet the video fails to convey correct information on the task at hand. Methinks viewers don't care about the content, just the appearance of the presenter.

🔧🎓🤝

😍🥰🥰❤️👈🏻👌🏼😎

Just ordered some small bore enforcers for my stroker 5.3 turbo build...cant wait to get to the point of figuring out what size push rods I need. Very helpful video to prepare for that. Yee yee

kool.thats where I'm at from replacing ol bent rodes caused by a timming chain😜

Great presentation--organized, methodical. There are two additional things I would have liked to see on this video.
1. Better closeups showing more clearly the white pattern on the valve stems.
2. Since some builders may be opting for roller rocker tips, it might be informative to see this demo performed using roller tipped rocker arms.

Use a dial indicator on top of the rocker to measure slack, then add the demension to the top of the adjustable pushrod. The dial indicator has to be measure right above the pushrod not the middle of rocker. Just help get a number closer to proper length pushrod.

Can't leave the stock valve springs in and pull a pattern on the valve stems with hydraulic lifters. The pushrods will be pushed down to the end of travel on every rotation.

I feel bad for the people who are going to attempt this at home with a hydraulic lifter with no oil in it.

Personally I would not use the checking pushrod to rotate engine with regular valve springs. I use light checking springs.

What the heck was that she dont know what the heck she's doing what a mess AFR would be ashamed she dose not know how to do that.

how do you measure the pushrod?

That was actually an easier to understand video than most I've seen. 👍

This video is a mess! Didn't anyone from the AFR tech department double check this? The basic idea is solid, but with a bolt down non adjustable rocker all you are doing is adjusting lifter preload. You have to raise or lower the fulcrum (middle) point along with push rod length to make the pattern change like she was hoping. Most adjustable rocker systems use the stud and polylocks to do this, but I have seen a shim system for certain bolt down rockers like a 5.0 or Vw bug that can be used to raise the fulcrum.

Sorry I didnt hear a single word.

This video does not even address valve train geometry. At all. The axis of the rocker needs to be 90° to the valve stem at half lift. On a pedestal rocker or shaft, that's done by shimming the rockers fulcrum height relative to the head. THEN you can select the proper length pushrod.
Or you can just bolt crap together. Either way 😆.

Please for the love of God. Don't measure push rods with a tape measure

Not the proper way to do this, couple key steps are skipped. Whos running things these days?

All wrong you have no idea how much pre load is on the lifter and if you use a real spring it will bend that pushrod checker.

absolutly false... you need to do this with a solid lifter.. please AFR there are many in the industry who knows how its done CORRECTLY, please hire them