When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have a 74 with 4 bolt holes along the LHS exhaust manifold that have been 'plugged' with fine threaded brass caps. One has blown out. Does anyone know the thread type and bolt size of theses. Where all metric down under and I'll have to order theses on line
Looks like someone removed the air tubes from a air pump. I didn't even think a 74 had them. Not certain on size.
However I'm in Queensland and most Bunnings have a fair amount of "Imperial" hardware. As do most bolt shops.
(I still find it funny calling SAE hardware Imperial, and I've been here 15 years!).
as per the size however, certainly you have some spare bolts laying around you can at least check thread size. Or just run a tap in that hole and change it to what you do have. Your just plugging an unused hole.
Or maybe now it's time to splurge on 2 1/2 inch ceramic coated manifolds or some long tube headers. (Extractors in Oz).
Someone jammed brass in mine too..
lots searches and failures..
here is my thread and solution from ACE hardware..also look better, went all the way in not partially.
i used never sieze, not sure why..
was for a 79 https://www.corvetteforum.com/forums...tion-plug.html
Try looking in the plumbing dept. At Bunnings. That's where your likely to find a pipe plug. I found one that fit my intake manifold a few years ago that way.
They are 1/4"-18tpi NPS (national pipe straight), not NPT (tapered).
Bunnings won't gave anything.
You need to go to a hydraulics supply place, ryco, pirtek etc.
Unless someone has already butchered your existing holes, then a tapered might force its way in.
Manifold bolt size
