Header Bolts

STP72 · Nov 25, 2006

I purchased some used headers and went to do the install.. It turns out I can't use the factory bolts mounting bolts what can I use instead?

Thanks

Jaswir · Nov 25, 2006

goto autozone or advanced... they sell header bolts...

sn9550 · Nov 25, 2006

You can get header bolts at your local auto parts store. They are generally 3/8-16x3/4".

86bluecobra · Nov 25, 2006

I f i was you now would be the time to buy stage 8 header bolts that have the locks on them. nothing worse then rear bolt falling out and blowing the header gasket.

8950HO · Nov 25, 2006

When I bought my Mac 1-5/8" shorty headers,they came with 3/4" long bolts.

I did not use them.I went out and bought 1" long header bolts...the same length the factory used.

With 3/4",theres not much thread left after passing through the header flange + the gasket.

I don`t know why this 3/4" length is popular.

bryce93lx · Nov 26, 2006

i don't know if all parts house's can get them but i use the header bolts that have 3/8 heads on them and they make life much easier

Shakerhood · Nov 26, 2006

86bluecobra said:
I f i was you now would be the time to buy stage 8 header bolts that have the locks on them. nothing worse then rear bolt falling out and blowing the head gasket.

X2 on the Stage 8s.

jtfairlane · Nov 26, 2006

8950HO said:
I don`t know why this 3/4" length is popular.

I had bought 1" ARP header bolts for use on a set of Hooker Headers on AFR 165s, the 1" were 1/4" too long and just bottomed out in the cylinder head without the head of the bolt ever contacting the header flange. 3/4" was the right size.

jtfairlane · Nov 26, 2006

86bluecobra said:
I f i was you now would be the time to buy stage 8 header bolts that have the locks on them. nothing worse then rear bolt falling out and blowing the head gasket.

How could loose header bolts be responsible for blowing a head gasket?

8950HO · Nov 26, 2006

jtfairlane said:
I had bought 1" ARP header bolts for use on a set of Hooker Headers on AFR 165s, the 1" were 1/4" too long and just bottomed out in the cylinder head without the head of the bolt ever contacting the header flange. 3/4" was the right size.

I heard the threads aren`t deep enough on the AFR heads for 1" bolts.
Doesn`t sound like a good idea on their part,especially with an aluminum head.

I`ve read stories of more than a few guy`s stripping the threads on them.

86bluecobra · Nov 27, 2006

jtfairlane said:
How could loose header bolts be responsible for blowing a head gasket?

sorry thats the header gasket my bad.

mob · Nov 27, 2006

I went to a local supplys store, and got 3/8-16x3/4" that size bolts. But I got them with the hex style caps, so I can use an allan wrench instead of wiggling the sockets around the tubes.

Header Bolts

STP72

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sn9550

86bluecobra

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8950HO

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Shakerhood

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