Header Bolts

[1993R]

I have a quick question. I'm sick of loosing header bolts so I'm going to use some stage 8 locking ones and replace my header gaskets while I'm at it. My question is what size to use with FMS headers. There are two sizes 3/4" and 1" . Any suggestions?

 

[tunedin302]

I have seen the 1" as a recommended size but I am sure someone else will chime in with actual experience. I have set of the 1" waiting to go on my GT but I need to finish the motor before that happens.

 

[carguy19]

Put some thread locker on them when you install them. Not the permenant kind, the loc tite regular stuff and you wont have problems anymore.

 

[tunedin302]

Put some thread locker on them when you install them. Not the permenant kind, the loc tite regular stuff and you wont have problems anymore.

I have done that and it seemed to burn right off.

 

[1993R]

Yep same problem. Probably cause I don't drive the car much and then go do an HPDE for a weekend. All the rev's and G's are backing them out........

 

[Kevins89notch]

Screw header gaskets. Some red RTV, stage 8 locking header bolts, and thats all thats needed.

 

[tunedin302]

Screw header gaskets. Some red RTV, stage 8 locking header bolts, and thats all thats needed.

:??: The question was what size stage 8 bolts - 1" or 3/4".

 

[stangbear427]

I believe I used 1" bolts with my FMS headers, but it was a long time ago. Now I think about it, half of them are missing too...

 

[carguy19]

I use the arp bolts with the loc tite. What I do is put the bolts on with no loc tite, then take the car out for a nice long drive and let it heat up. Then I go back pull the bolts one by one and loc tite them and tighten them, never had a problem after that.

The main problem is that they loosen up when the header gaskets shrink down.

 

[Kevins89notch]

:??: The question was what size stage 8 bolts - 1" or 3/4".

Don't know. I bought them about 4-5 years ago.

 

[19COBRA93]

It just depends on the thickness of the header flange. With the FMS headers I think the flange is only 1/4 or so, I'd recommend 3/4" bolts. BBK has 3/8" thick flanges and some use 1/2" flanges, for those definitely go 1" bolts. Measure your flange thickness.