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How do you drill grade 8 bolts?

I've looked at Proform 66752 - Wedge-Locking Header Bolts . And Percy's 310074 - Vibe-Lock Black Oxide Bolt The hard part will be getting the size I need when that is determined.

I don't think the 10 mmX30 mm locking bolts with the 15 mm heads are actual header bolts. We had Allen head cap screws in the beginning and they would always loosen and/or fall out.

I don't know for sure, but they talked about .4375-.5. I talked to the Stage 8 people and the only locking bolt they have that's 30 mm long has a 15 mm head on it, which is too big to clear the pipe. The same would be going with studs and nuts. I may have to go back to non-locking header bolts...

The locking header bolts I have are 10 mm X 25 mm. By your rule of thumb, the bolts I have would be about 5 mm too short.

I sent the headers back to Peninsular's fabricator. They are going to try to fix them with thicker flanges. I'm hoping the locking header bolts will be long enough to reach through the thicker flanges and the gasket.

They are nickel plated steel.

Maybe that was a sign?

You are right, it could always be worse, but it was raining when the transmission started acting up. It was somewhere in Ohio, it was raining hard and the transmission was shifting up and down and jerking. I had no idea what was wrong. I pulled into a Home Depot parking lot to check the fluid...

I was able to locate gaskets that might work. Remflex Performance Promise • Seals Warped Flanges: Remflex exhaust gaskets come in a standard 1/8-inch thickness and are designed to crush 50%. This allows them to fill gaps in the flange surface up to 1/16-inch! • Won’t Burn Out: 100% flexible...

Getting frustrated? Let's see, 1. It took forever to get the engine, transmission and related parts shipped in. 2. The transmission arrived broken in shipment and took weeks to get a different one. 3. The transmission that was sent was for a 4X4 truck, not a motorhome. 4. No transmission was...

In hindsight, maybe I should have stayed with the stock exhaust manifolds, but there wasn't much room for the bigger turbo on the side. I'm thinking I would have had to add onto the doghouse cover and cut more of the floor out, thus reducing passenger space. My thoughts were to have a more...

I'm not sure it's Peninsular's issue, since it's been 3 years since the headers were fabricated and how do I prove they made a mistake and not the installer or the fact that I wrapped the headers prior to use. Also the people (machine shop guys) have years of experience of building drag race car...

I just picked up the headers from the machine shop. They couldn't mill them because there wasn't enough material to work with. I talked to Peninsular and instead of building all new headers, they can cut off the old flanges and weld on new thicker flanges using a jig to keep everything in...

HA HA!

Yesterday, I took the headers to the machine shop. They are going mill them removing the least amount of material as possible. They also suggested using 3/16-1/4in hardened steel washers to distribute the force of the header bolts. We talked about copper exhaust gaskets with the embossed O-ring...

The headers are coming off. I will check them for straightness and decide what to do from there. I emailed Peninsular with several questions about the header leak issue and the possibility of replacing them.

I'm not having much luck finding after market gaskets for the 6.5L TD. Are they the same as a big block w/D shaped holes?

We used those locking header bolts one week ago today with high temp RTV, no gasket. Like I said, it lasted about 500 miles before blowing the RTV out. The bolts stayed tight. Yesterday I spoke to a machine shop about milling the flange surface. They were somewhat reluctant because taking...