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Hey Mitchell, I'm not familiar with the Speedmaster EFI (I'll go look it up), but maybe I can help get you started. Send me what you got for a fuel and VE map. Also, you mentioned the cylinders where drenched (at idle?), what is your actual AFR (vs target AFR, if you have it) when this is...

Hello Ole, Unfortunately, it does not work that way with these systems. Also, there is little to no back pressure in a GT-40 bundle of snakes. You can try placing a piece of paper or your hand next to the exhaust outlet and watch or feel the pulses and the negative pressure between the...

Adding my .02 cents here.....for you EFI guys, that exhaust needs to be air-tight, i.e. no leaks, no dependency on Hi-Temp silicone, etc. Any undesired oxygen (leak) will get picked up by the very sensitive wide-band O2 sensor and play havoc with your target Air-Fuel ratio, which can result in...

Mitch, Glad to hear you were able to push through the issue to your satisfaction. What engine/transaxle combo are you running? For the firewall access plate you will most likely have to cutout an opening and fab up a cover plate to hide the engine water pump pulley. You'll see this on...

There are a few sources for windshields and others I'm sure will chime in. Regarding the door handles, RCR may be able to sell you just the handles as pictured here: Door Handle Kit — Race Car Replicas

Mitch, Rubber grommets dry up, crack, and fall off...looks like crap after awhile. An alternative to the nylon fitting (holes >1") is what's used on aircraft and what I use on the larger bulkhead pass-thru. That is the Grommet Edging shown below. You'll need the 1/4" and perhaps smaller...

Mitch, Sorry to hear that....mounting seats was one of last things I did in the cabin area so I could find that sweet spot while I worked on the car.

There's a few ways to go for sure, but I can tell you that dumping wires into the engine bay should be avoided as it will be a cramped and busy area once you get your engine installed. I tried to keep it simple and have ease of accessibility by routing the wires using snakeskin wire wrap...

Mitch, From your last pic, it looks to me like you mounted your seat too far back. You need a little more working room for the belts to clip to that eyelet. Although you can route the lap belt around the outside top-bottom seat hinge area (yes, it's tight), you should also be able to route...

James, Beautiful work and attention to detail. I can appreciate the effort it takes to get where you are at now. BTW, can you explain the small dimple on the lower left of the engine deck in the first pic? I ended up filling mine on an RCR engine deck as my only explanation was some sort of...

What about blade design? Are the blades made to efficiently move air in one direction? Do you have the make and part number so we can look it up? There should be a rating for fan draw, constant speed and startup. Some fans only draw about 5-6 amps each in steady state, some pull over 20...

SOLD!!

Hi George, Welcome to the site! Yes, still available....I will PM you in a bit, on the road at the moment.

Mitch, I was under the impression that the hydraulic switch came with the kit. I have one of these (Painless?) hydraulic brake switch connected to a brake Tee fitting. Simple and works great. As for a microswitch, I have one mounted to the back of the pedal assy (clutch pedal) so you...

Hi Bob, I went with the outside measurements, sidewall to sidewall, for this RCR example. Since the OP was wondering about widest combinations within a +2 or +4 and what would fit without tire rub.

Ron, Check in with Bill Hough, he has or can make all the parts for you. Hough Composites Cushman Competition may have one, also check with RCR.

Don't cheap out, Walter! Will cost you more in the end...

Mitch, I have 3 switches on the left switch plate each wired to respective 30 amp relays. Switches are for Park lights - Low Beam - Aux (lower round headlights). I also wanted a "flash to pass" capability so there are two small aircraft "momentary ON" push buttons (PTT type) on the lower part...

FWIW, I don't see why you should cheap out on tires after investing all the time and money into a GT-40, only to lose control of the car or lock up wheels prematurely due to traction/instability issues. The Avons work great all around on the track and on the street. A different perspective for...

Still available