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Jul 28, 2018 | 07:25 PM

All Pontiac WS6

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On The Tree

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From: Lawrenceville, Ga

799

Hello All,
How much can you mill a set of 799 heads before you have to change push rod length?

Thanks, David

Jul 28, 2018 | 08:17 PM

G Atsma

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From: Central Cal.

Actually, you should check pushrod length any time milling is done. Even .01 (ten thousandths) is enough to need new pushrods, if the lifters are to do a proper job.

Jul 31, 2018 | 11:08 PM

poltergeist 02

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It really depends on what the current preload is and what lifter you are running.

Aug 2, 2018 | 02:13 AM

8.Lug

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From: PNW

With stock lifters you'd probably run your valves into the pistons before you ran out of preload.

Aug 4, 2018 | 08:56 AM

slogo

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Quote:

Originally Posted by 8.Lug

With stock lifters you'd probably run your valves into the pistons before you ran out of preload.

I always enjoy learning new stuff, would you please explain this theory.

Aug 4, 2018 | 10:37 AM

G Atsma

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From: Central Cal.

Yes; this should be enlightening...

Aug 4, 2018 | 11:20 AM

All Pontiac WS6

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On The Tree

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From: Lawrenceville, Ga

Please do......

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Aug 6, 2018 | 05:16 PM

00pooterSS

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From: Dallas

It would be ideal to shorten the push rods by the amount that you shaved the heads. Picture the rocker arm on a stock deck head, now take .030 off the head, the rocker is now .030 closer to the lifter, so you just took .030 out of that distance.

However, lifters have a pre load range, and you can be in about a .100 range and be pre loaded just fine, so if you take the head .010 to .030 down or so, you should still be in that general range and be fine.

I was gonna google and try to find out what the factory pre load is and before I got to it I came across this article, this article is a good read for you guys interested in pre load etc.

I know the basics of pre load and that there's a range, range is different with different lifters, but I'm not sure what the factory pre load is, anyone know off the top of their head? Be good to have that info in here.

https://www.lsxmag.com/tech-stories/...oad-ls-engine/

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Aug 6, 2018 | 09:49 PM

8.Lug

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From: PNW

From what I’ve read on here, the stock lifters have nearly 1/8” of travel. If your valves aren’t running into your pistons after shaving 1/8” off your head, that would be a damn miracle.

Aug 7, 2018 | 01:27 PM

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MuhThugga

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From: Wilmington, De

You think someone is going to knock .125" off the deck?

Aug 7, 2018 | 01:37 PM

#11

G Atsma

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From: Central Cal.

Quote:

Originally Posted by MuhThugga

You think someone is going to knock .125" off the deck?

Consider the source....

Aug 8, 2018 | 06:59 AM

#12

KCS

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Quote:

Originally Posted by 8.Lug

From what I’ve read on here, the stock lifters have nearly 1/8” of travel. If your valves aren’t running into your pistons after shaving 1/8” off your head, that would be a damn miracle.

That’s BEFORE the lifters are preloaded .060”+. So you’re really only looking at about another .060” before bottoming out the lifter.