88 5.0 header bolts

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12-30-2009, 06:05 PM

#11

motorman524

MF Informant

Join Date: Sep 2006

Location: Missouri

Posts: 2,690

Quote:

Originally Posted by nitrous_fed_03gt

cool thanks. so do you not think that the stock oem header bolts would work with aftermarket headers with a lil lock tight?

Like lxman said, I can't see them working either. I barely got the bolts that came with mine to work, no way the the stock bolts would.

12-30-2009, 07:23 PM

#12

lxman1

4th Gear Member

Join Date: Jan 2008

Location: Louisville, Ky.

Posts: 1,326

The factory headers are severely crimped to allow the larger headed bolts to be used. Aftermarket headers are not thus the large headed OEM bolts will not fit. I have never had a header bolt problem with the standard header bolts. I installed my MAC nickel plated shorties back around 1990 and used the supplied paper type gaskets. I have never had to replace those gaskets. The bolts loosened up during the first few heat cycles as they all do, but I have never had them come lose since. I'll see how they do when I swap out engines soon and I finally have to use new gaskets.

Last edited by lxman1; 12-30-2009 at 07:27 PM.

12-30-2009, 07:53 PM

#13

ALMOST STOCK

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Join Date: May 2007

Location: Calif

Posts: 1,926

Quote:

Originally Posted by nitrous_fed_03gt

can somebody please tell me what the factory length headers bolts are? im getting ready to replace my crappy paper gaskets on my aftermarket headers, and wanting to go with a bolt with a 3/8" head on it. makes it much easier to tighten down but just unsure of length. thanks

Sorry I couldn't help answer your question

12-30-2009, 09:41 PM

#14

nitrous_fed_03gt

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Join Date: Jan 2007

Location: mo

Posts: 919

so like the percy gaskets, can the stage 8 bolts your talking about be used more than once? i ask because i know in the next 12 months i will be taking the turbo route but until then, im just freakin tired or hearing the crappy leak i have, and i also know im going to need a good gasket and bolt for the turbo manifolds so what better than to be able to re-use what i already have.....

12-31-2009, 05:38 PM

#15

MADMAC

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Join Date: Feb 2005

Location: Greenville, SC

Posts: 248

Quote:

Originally Posted by nitrous_fed_03gt

They will last longer than you will!!!!!!!! You can use them over and over again. As long as you don't mess up the threads.

01-01-2010, 09:45 PM

#16

nitrous_fed_03gt

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Join Date: Jan 2007

Location: mo

Posts: 919

i found some percys locking header bolts on ebay for $59.99. had the same concept sounds like being able to tighten them with allen wrenches. what do you guys think? any different?

Last edited by nitrous_fed_03gt; 01-01-2010 at 09:52 PM.

01-01-2010, 11:05 PM

#17

ALMOST STOCK

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Buy um!

01-02-2010, 06:47 AM

#18

MADMAC

2nd Gear Member

Join Date: Feb 2005

Location: Greenville, SC

Posts: 248

Quote:

Originally Posted by nitrous_fed_03gt

i found some percys locking header bolts on ebay for $59.99. had the same concept sounds like being able to tighten them with allen wrenches. what do you guys think? any different?

I believe what you are looking at are the Percy's Split lock header bolts. The Allen head on this is to set the threads into the head not to install. But, if you get the stainless they are still a great product. http://percyshp.com/store/index.php?...wCat&catId=412