header bolt size

superspec · Aug 6, 2007

after breaking 2 water pump bolts and not having replacements im looking for header bolts to replace the stockers when i do my exhaust next week.

what size and thread pitch do the stock heads take? ill be using nothing but grade 8 stainless with lock washers.

Foxfan88 · Aug 6, 2007

3/8-16

superspec · Aug 13, 2007

ok one more question.

i got the bolts in 2/4 and one inch.

now i need to know what size to get for the header to h pipe. i hate useing old bolts.

juiced_94gt · Aug 14, 2007

5/8 coarse, by the way dont forget lock washers for the header bolts and the flange bolts.

superspec · Aug 14, 2007

juiced_94gt said:
5/8 coarse, by the way dont forget lock washers for the header bolts and the flange bolts.

thank you sir and yes i got all the lock washers i need for this!

juiced_94gt · Aug 14, 2007

superspec said:
ok one more question.

i got the bolts in 2/4 and one inch.

now i need to know what size to get for the header to h pipe. i hate useing old bolts.

Oh and use the 1" long bolts for the headers

5spd GT · Aug 14, 2007

Yep, 3/8”-16 either at 3/4" or 1.0" length - go with 1" if they don't bottomout with your header flange thickness.

4G-KDMP · Aug 14, 2007

the stock header bolts are 3/8x16x3/4 sae.

Shakerhood · Aug 15, 2007

I used the 1" Long ones with my Ford Racing Headers as they have a pretty thick Flange

header bolt size

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