Geoff

That's what I've heard from J. Pepper, that the heads put on the last of the performance Studebakers would have been more at home with the 3.875" or 4" bore blocks. Oh if only Studebaker could have been in business exactly 10 more years, and bowed out with the oil crisis, Dec. '73. Due Cento could have returned to Bonneville on dry salt and recorded 200 MPH. Maybe ... possibly ... a privateer team campaigning a 5L Challenger in 1966-1972 SCCA Trans-Am?

Thank you for that suggestion. My current plans involve some research to find another vehicle's spoiler style moonroof to install in my car. The spoiler style slides over the top of the car when fully opened. I was advised by a sunroof company this gains as much as 1.5" more headroom over the inbuilt type. If I become extremely anal retentive adhering to Colin Chapman's, "Simplify, and add lightness" another alternative is to buy the least expensive sunroof type which either pops open at rear, or gets removed and stowed to be opened. Two other choices I have involve closing the hole. I could DIY that with either fiberglass/FRP, or maybe some tinted polycarbonate/Plexiglass and seal out the air but let sunlight in.

No problem. I shall be removing that moonroof as these next seasons progress. 4174 is getting torn down to bare minimal levels, as I have a massive build in mind.

I took the car cover off today, it was finally warm enough for that. Here are some behind the scenes peeks at what lies beneath (above) the headliner. My poor basket case was left outdoors 24-ish years, uncovered with a leaky moonroof, so um, rust happened. But besides that, this is how the moonroof is in the car. I'll be taking this one out of the car in my quest to build her back to my specifications. My post above this one goes into that. The first image is looking back from the windshield The second is at the rear, the rear glass is to image's left. Last pic. is along the left side, looking toward interior's rear.

How is your research coming along for this question? I have a 1985 that I'm tearing down completely and don't need many (if any) parts out of it. That being said this thing sat up to her rocker panels in Mother Nature for quite some time. I'm ditching the whole shebang, no more solid axle, leaf springs, or auto trans. Once I remove things later this season I can take a leaf spring height measurement off the car. How much settling was done on mine? I don't know but my car didn't get driven at all post-1997.

Yep, seat belt light. My '85 has that light in place. Well had, anyway. I'm tearing down for a resto custo mod. But 4174 was a basket case anyhow.

That CHMSL looks like the ones used on the roll hoop of C4 Corvettes (1986-1991, plus all ZR-1). There are 'vette owners whom have swapped those halogen bulbs for cheaper and modern LED solutions. Search the Internet for C4 ZR-1 CHMSL LED and that should get all the necessary information to make the conversion.

Guessing, 3) Eighty

I did put Silvertone loud mufflers on 63R-1025 August of 2021. It was loud! There were some type of glasspacks on it before those went on, but they had one baffle within (couldn't see through those mufflers). The former mufflers were loud but not as loud as the Silvertone ones. Also, 1025 was an R3 prototype so I wouldn't know exactly how an R1 would sound but that combination was a raucous.

Check out SpinTech mufflers. Similar to Flowmaster's lineup they have different series (and shapes) ranging from mild to race. The flow through their design is great. I had a model 3222 on a Mk1 Rabbit GTI and it was a hearty sound, all things considered. I am thinking of building my Avanti like so: Custom long tube headers into a 3" collector, then down to 2.5" pipes with Silvertone's loud option between the outer rail and X-brace. Then cable/rod or electronically opened cutouts, with Spin Tech mufflers mounted somewhere aft of the frame kick-up. That'll be four mufflers in sedate mode and only a pair of Silvertone loud for obnoxious mode. I mean I'm going to be an LS-based Blake, but that should still cause quite a stir. Plus, with Lee Z. doing his things, I might be able to substantially derestrict this build.

From my home of San Jose. Still have my 408 mobile number. At least the metal parts beneath should be good, maybe light surface rust but that would be the extent of it.

At best I can apply general knowledge. Differences in traction bars, radius rods, an added Panhard bar / Watts link? Do their pinion angles vary? Does one model have a pinion snubber and the other doesn't? "Since the snubber tries to lift the car at this point, the rear differential is actually forced downward and improves rear traction." - https://www.hotrod.com/how-to/mopar-rear-leaf-springs-suspension-get-hooked-up/ Sounds like a piece I'd love to fabramacate on my future 1025 modded-dupe … along with some Super Stock Dart leaf packs.

I'll yield to someone who knows these cars, as I haven't dug into the 'Lark lineage' much.

Acceleration contest. Which test are we running? [0-60, 1/4 mile, 1 mile, V-max] I don't know the inner and under workings of these specific cars. My guesses are: Weight bias. Suspension geometry. Aerodynamics.

"not quite there" leads me to believe it's further to go, rather than an overshoot. 4) 63R 1004