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Chris: thanks for the offer. I do have a lathe and good enough knowledge on how to use it. If the belt contact surface for the idler pulley in question was just flat, I'd have made one already. The belt surface on this pulley is 6 grove along with flanged shoulders. I could probably make one...

Alternator Mounting So after figuring out a decent serpentine belt routing, it was time to fabricate alternator mounts. There are only M8 sized bolts on the engine top front, which aren’t all that big, so I had to figure out a mount that would include some bracing to spread the weight out...

I did more investigation today and was able to answer my question. Yes, the hole I opened in timing chain cover is open to crankcase windage. I poked around through the hole some more with a cotton swab and this time came up with a trace of oil. I'm guessing that since this is a 15k mileage...

Thanks for that suggestion. Oh my, don't I wish for the good old days when there were knowledgeable counter people at the auto parts store. I used to walk in with a close enough description for what was needed, they'd leaf through some paper catalogs behind the counter and they could tell you...

Alternator Belt Routing In working through wire harness routings, it became clear that I needed to figure out the placement and mounting for a central component of the electronic system, the alternator. The original Miura had a somewhat quirky, non-standard element to the alternator in that...

Chassis Wiring While waiting for the header components to arrive, I decided to start figuring out some of the chassis wiring. I had prior purchased a wiring kit from Painless Performance that includes all the commonly used wiring circuits pre-terminated at a fuse block. So basically a fuse...

Thanks for all the good information and feedback on this topic! My impression based on the feedback from this forum and ClubCobra.com is that the majority of EFI outfitted engines with single slip collectors have an issue with air leaks sometime in their service life. Some of these air leaks...

Andrew: it's a bit hard to tell from the picture, but does your collectors only have a single lug holding them on? Are the lugs welded on top of the slip area? I've been told to weld the lugs after the slip area as welding on the slip area does cause warpage that can lead to a leak. I'm...

I am in the middle of fabricating headers for my Miura project car and was warned by someone that single slip merge collectors can leak air in causing a faulty O2 sensor reading that leads to a rich A/F condition. So my question out to others that have a similar setup (EFI and equal length...

Header Design/Mockup (cont.) Header fabrication continues with the mockup of the fore side (drivers side) header. I start the mockup process by starting with the exhaust port that is furthest from the collector, in this case that’s the rearmost port as the collector will be routed under the...

Header Design/Mockup Header fabrication is now underway, well at least the first stage which is full mockup fabrication to determine header tube routing optimized to get to an equal length design. The specification calls for 28 ½”primary tubes that taper from 1 5/8” to 1 7/8” over their length...

Chassis Member Reinforcement Now that I have cut out the chassis next to AC compressor and belt to get sufficient clearance, I decided it would be wise to add some metal back for reinforcement. I don’t know that this reinforcement was strictly needed but I thought it better safe than sorry...

Progress on Transaxle Shift to Header Clearance While I was busy fabricating engine mounts, I put out a request to Pete Aardema to make a new billet, one piece shift mechanism with the objective to increase header clearance as compared to the two piece unit I had cobbled together. As a...

Engine Mount Completion The engine mount fabrication is now complete; all that remains is to weld the mount pedestals to the frame rails. I’ll need to pull the engine out to get access for the welding so I’m going to try to complete more things that need the engine in place before pulling it...

Engine Mount Progress I’ve made more progress on fabricating engine mounts with 2 of 4 now complete. On the mount attached to the final drive case, the metal cut away from the main part is used to extend the mount downward for the 3rd bolt attachment. The metal was cut to shape, a ¼” bevel...

AC Compressor & Engine Mount Progress When it comes to mounting the engine/transaxle package in my Miura, it’s coming down to fractions of inches, literally fractions of inches. The critical spot is between the upper suspension joints, specifically the heim joints at the front of upper A arm...

Header Design Progress This is a progress update on the Miura engine headers. I’ve been working with Vince Roman at Burns Stainless on header design options and specifications. Burns offers free header design services if you buy the various header pieces from them. The primary objective on...

Header Mockup I spent a day starting the mockup of an engine right side header where there is the transaxle clearance challenge. The header flange is the old rusty one cut from the factory header and I used 1 ¾ mandrel tube bends for the mockup. Primary tubes on ports #1, 2 and 3 (right to...

Excellent approach!! I have plenty of aluminum sheet scraps around the garage that could serve as the "removable plug". A seal of RTV should fully take a compressed air blast from shaving cleanup. I'm guessing any RTV flakes that might make their way into cylinder after plug removal should be...

Interesting, can you give more details on the cracking issue? For example, was the header material mild steel or SS? How tight of a tube bend radius did you have? Did the cracks occur in the joint between flange and primary or were they just in the primary tube? I ask these questions as I'm...