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Tried redlines on the 71SS....

When I switched over to 134 Freon I was told to only put in 75% of what the factory recommendation was. That is what we did when the system was first charged and it worked great.

In a Stock First Gen Monte AC System, with the entire system completely empty of oil and refrigerant, the system requires 11 ounces of the PAG Oil throughout the entire system. A stock compressor only holds 4 to 6 ounces of PAG oil so the other 5 to 7 ounces of PAG Oil has to be introduced in to other components in the system and then the system sealed. I do specify a Stock/Original compressor system because some other compressors may hold more but a stock one does not. rob

I'll take a stab at it.... First, if it's all new, I'd ask the place you got it from for their recommendation, if that's possible. In my case, I got a complete Stage 3 upgrade R134a system from 'Classic Auto Air' with a sanden compressor. They state DO NOT add oil, since the compressor is already loaded with a full system charge. In fact, they want you to flush the rest of the system out if it was existing so as not to have too much oil (and get rid of old/bad oil, etc). As far as refrigerant charge, they said 45 oz nominal, but in a 42-48 oz range. Start out with 42 oz, monitor center vent temp and add an oz at a time until it either stops lowering the vent outlet temperature, or starts rising.

Add fresh gas and drive.

I've used either the GM Fuel Treatment Plus, or what used to be the equivalent from Chevron, their Fuel Treatment Concentrate. The GM stuff was called out in their service bulletins for some drivability problems. Some vehicles had fuel gauge issues and this was supposed to help clean deposits off of them. Also used more as an injector cleaner you could put in your gas tank. Looks like the bottle is smaller and different now with the GM stuff, but it used to be exact, even the bottom of the GM bottle had the Chevron emblem molded on it. Advance Auto has the 20 oz bottle on sale now for $7.99 https://www.amazon.com/Chevron-Techron-Concentrate-System-Cleaner/dp/B00092893E/ref=pd_cp_263_2/141-4796413-7955602?_encoding=UTF8&pd_rd_i=B000CCOL3I&pd_rd_r=b4ef39e5-fa59-4b27-be83-a04c9bc0fa42&pd_rd_w=TsSyd&pd_rd_wg=xKboN&pf_rd_p=0e5324e1-c848-4872-bbd5-5be6baedf80e&pf_rd_r=MN2QZ482B3YM1EBCH26D&refRID=MN2QZ482B3YM1EBCH26D&th=1 Like Tom says below though, for a few months old gas, fresh gas & go would work.

Yes Dennis my SSs should be jealous as this seems to be a very nice car. It is Fathom blue with a black vinyl top and the interior is blue cloth. As mentioned in a previous post, i was able to confirm (with pictures) that the motor and transmission are numbers matching. According to the seller, the car had one repaint which included some minor ding fixes back in 1980. The metal is all original and solid (no rust) but there is the beginnings of some bubbling at the rear window but it looks to be just surface. I will know more when I get it here and can look it over and get it up on the lift but I am super happy to have found it. I am not yet sure how original I will keep it...maybe just change out the bench for a set of buckets with the console and possibly add A/C. Of course I will keep the original parts but I just can't see me enjoying the four speed with a bench seat haha. My buddies all think I am crazy LOL because all I do is buy and never sell anything. I now have 6 1970 Montes...4 - SS454s, 1 - Covertible, and this latest 1 a BBC 402 with 4 speed. All the Monte's are original numbers matching (except of course the convertible which is just a super nice example of how the conversion should be done) and in near perfect condition. In addition I recently bought a 1935 Chevy truck that although complete and solid (no rust California truck) is in pieces and needs painted and reassembled. It is a good thing I don't have a wife, I would likely have been shot by now. Here is a picture of some of my collection in front of my shop...

Thanks for the input guys. Yes Dennis, I was aware of that location and it turns out that is where this motor is stamped...it is a numbers matching car. I just bought it YAY!!!

1979 to 1982 I had a 402 4 speed w/ bench seat Monte. I wish I never sold it. My current Monte is a 1970 350 4 speed. I do not have a build sheet. The numbers stamped on the pad are T1106CNJ. The partial vin is difficult to see due to some pitting on the pad I needed a magnifying glass and a light held at a certain angle and I could make out that the last 6 #s of partial vin do match the vehicle vin. With that info I am positive that mine is an original 4 spd. car, even though the trans #s don't match, since CNJ applications were manual transmission. A previous owner stated trans was replaced because the original one "blew up", which is quite vague. Anyway that's all I have to go with and I enjoy driving it. John S

Mark. Jeff in nj. I’m building a 496 with 6 speed and the arh headers fit perfectly on my 70 Monte .