Manifold bolts change - Harrop single plane manifold

[Immortality]

I have stainless cap screws in mine.

I seem to remember 3/8 x 2" UNC

 

[Scatman696]

If you are just replacing the bolts, remove one and replace, torque to spec and then do the next one. Don't take all the bolts out at once so you don't disturb the gasket, last thing you want is it leaking around the coolant passages.




And what about the order to torque up the bolts or is that not important either? No, the bolts don't have to be torqued to spec but it is good practice, especially when you are working on customer cars.

Factory specs attached for reference.

Fantastic thank you!

 

[Scatman696]

Take a bolt out and go to your local fastener business/shop (not Bunnings, not Ebay, not Rare Spares), they can match whatever thread/pitch/length you have, plus you can pick whatever material and head you want

I needed new longer bolts after fitting thermal spacers, I ended up getting hex/cap head stainless bolts in the correct size that cost about 50 cents each

Buying fasteners from anywhere other than a fastener shop is pissing money away, you would surprised at the mark up that people put on fasteners

Typically a box of 100 M5 x 50mm 304 stainless cap heads cost "around" $60

https://www.allfasteners.com.au/cap-head-socket-screw-gr304-stainless-steel-metric

Google "fastener shop near me" and look at their range

Wow - I like this cheers!

 

[gtrboyy]

Mine has stainless steel Allen key bolts.

One click of wrist with short Allen key then go over it again...

Arrp engine dress up kits be nicer to have!!!

 

[Scatman696]

Hey legends,

I’m done and dusted - installed the bolts as per spec to diagram and torque to ensure no mistakes.

Pictures of old bolts (they were so overdue to be changed)

And new hex bolts in - absolutely love them!!

Thanks for all your advice and help. Much appreciated guys - legends

 

[Scatman696]

Hey legends,

I’m done and dusted - installed the bolts as per spec to diagram and torque to ensure no mistakes.

Pictures of old bolts (they were so overdue to be changed)

And new hex bolts in - absolutely love them!!

Thanks for all your advice and help. Much appreciated guys - legends

 

[Scatman696]

Just to add to the post - I went to my local fastener shop - 14 stainless bolts with washers - cost me $10 bucks. I was like wow - so stoked with outcome.

 

[Ginger Beer]

Just to add to the post - I went to my local fastener shop - 14 stainless bolts with washers - cost me $10 bucks. I was like wow - so stoked with outcome.

Shiny for the win

 

[Immortality]

Just to add to the post - I went to my local fastener shop - 14 stainless bolts with washers - cost me $10 bucks. I was like wow - so stoked with outcome.

What size/length were they so anyone seeing this post in the future has the info please.

 

[Smitty]

I use the later EFI engine factory bolts .. coz they have a larger head (than the allen key variety) to clamp the manifold