Zedman

Hi Brooks. If you have a Disc Drum system on your Avanti, you probably (read, ought to !) have a proportioning valve on it. I had a Kelsey Hayes valve on the inner Left hand Frame Rail down below the Mastetr Cyl location. I have replaced it with a GM PV2 Combination valve which has the same port configuration of the old KH unit and even bolts up exactly the same. I believe the bottom port of the Master Cyl will be for the Front Disc system. This line will go to the Combination valve as indicated in the screen shot posted- i.e. top, next to Brake sensor, at the end closest to the little rubber plunger cover. A shot of my Master cyl is also shown for your comparison. If you need further clarification please do ask.

I believe you will need to remove the original Rivets. These can be replaced with similar rivets if you trim the length so when assembled , you have only 1 x the diameter protruding. These can be gently mushroomed over with a hammer (buck the head end on a soiid flat steel surface) to secure the cover once again. Tinmen's or pan head rivets ought to do. You might even be able to use suitably sized flat head nails as substitute rivets (done that before). Pop rivets might do but use steel ones not Aluminium otherwise they might loosen up in service.

Thanks Ron- I will compare that carb number to the ones I see here in Oz and pick one up eventually. My 305 will likely require a re-jet smaller , I excpect.

Thanks MFG- I have recently fitted a dual exhaust (minus Cat- I'll take a risk.. ) whilst the body is off the Frame. The Carb and Distributor are up for substitution after I get the car reassembled and inspected for roadworthy. I'm looking for an Australian delivery carb that was jetted for the Holden 308 or Pontiac Parisiennes befor the late 70's.

Hi All- As an aside whilst this thread is open... I have a 1981 EME Carb that I'd like to replace with an un-ECU controlled Quadrajet someday. Would somebody mind putting up what Carb Code numbers might be a good idea for substitution. BTW if I do go down this route , the AIR Injection system and Catalytic converter will also be gone too. Charcoal Canister will be staying , however. Thanks...

Hi Klaus- I'm making a few assumptions here but having replaced the mountings for my 1981 305V8 recently, I'd wonder whether they might be the same because these engines are small block Chev. I used the same ones recommended for Corvettes 1969 to 82. I have engine mount 'pedestals' on my Front Crossmember as in the photo. If yours are the same, I'd look at the corvette mounts. By all means let me know if I'm wrong !

Thanks for the feedback everybody- Question for Ronmanfredi and Geoff.... How does the roof Headliner come off? I have no Idea how to remove that and I'm wary of spoiling it. 🤨 My Sunroof is already well corroded and I reckon it will need removal for any repair/restoration.

Geoff- I applaud your pioneering work and the photos help tremendously. I cannot help but think repairing my sunroof might be folly given I have extricated some really rusty metal pieces so far. In any case your pictures paint a very good picture of what is in store- thank you and keep 'em coming ! 👍

Update- I have managed to remove the outermost screw easily, however the innermost one is rotating without releasing. We have pushed wedges under the base of the bottle and rotated the screw in an attempt to raise it, but no go so far. I don't wish to resort to butchery so if this won't come out I think I'll have to very carefully grind off the head of the Screw using a finger belt grinder or similar. Going overseas for a month shortly so this might be a dead thread until I get back....

Thanks Grant- much appreciated... I had gotten under there but will be a bit more prepared for what to look for, next time.

Appropos 1981 Avanti II - Can somebody please provide some feedback about how to go about removing the windscreen washer reservoir/bottle. How is it attached? Repainting the engine bay soon so info is very appreciated. I'd hate to bust it. 😒

My Avanti II 1981 model had the Kelsey-Hayes Proportioning valve on it and orignal Bendix Calipers when I broke the car down for frame off resto. Because the K-H unit is a bit of a rarity and hard to replace parts for, I decided to go with a brass GM PV2 proportioning valve . This valve is specifically for Disk & Drum combination and is a bolt-up replacement for the K-H valve. From what I have researched, a proportioning/combination valve is there for the purpose of allowing the rear brake drums to apply just ahead of the front Discs- that's all. This is to prevent the front brakes propping, and causing the rear end to 'come around'. For this reason, I wouldn't fob off the idea of using a combination/ proportioning valve. I wonder whether you might have a an issue with the right rear brake applying with more gusto- causing a right hand veer. May I suggest checking the orientation of the Shoes, adjustment of the shoes, the condition of the rear Flexible brake line (they are often blocked- like mine were), the condition of the brake lines along the rear Axle (I found mine crushed !) and condition of the rear brake cylinders. After that, maybe look at utilising a propvalve?

I'd like to thank all of you who have contributed to this query. Despite the simplicity of applying sealant to the area, I feel that I won't get away with it when the car goes for inspection. I'm leaning toward fabricating a two piece steel cover that can be attached either side of the hole and possibly adding some heat sheild material to it or a flue seal. Either way I reckon that the area needs something to negate heat flow into the cabin. 🙃

thanks Peter- I will do that, thanks for the idea.

Thanks Mel- yes that is the plan... looking at something called Dynamat over here. I will be placing this stuff underneath the floor in the Transmission Tunnel and inside the shifter box to ward off heat from the engine and trans. Of course I will be doubling that up with something similar on the inside as well. An owner I know over here owns an all black Avanti R2 and absolutely swelters in our summers.