Correct AC Rad Core Support For 1968 427 390HP?

[Wayne W.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

Here is a late SB with AC. Note the rubber dam, the shroud extension.

Other Side.

[Joe L.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

I would think that the early supports that were intended for metal shrouds, probably didnt have the holes pre-drilled. The later that were to have the fiberglass shrouds could have already been drilled. I dont know. The fiberglass shroud is the same basic shroud that was used maybe very late in `67 on BB cars. I am sure it is essentially the same as the service shroud for the 67 BB.

Wayne-----


Yes, the 67 big block and the 68 big block/68 small block with C-60 and/or M-40 shrouds were basically the same. However, there were some interesting differences. In PRODUCTION, all of these shrouds were assembled at St. Louis from 3 separate pieces. But, the 3 pieces that were used for the 67 big block were all different than the 3 pieces that were used for the 68 big block. And, the 3 pieces that were used for the 68 big block were different than the 3 pieces used for the 68 small block with C-60 and/or M-40. How were they different? I don't know, but I think the differences were rather subtle.

Once-upon-a-time, all of these pieces were available in SERVICE and no complete assembly was available in SERVICE. However, eventually all the pieces were discontinued and replaced by an assembly that SERVICED all 67-68 Corvettes with the fiberglass shroud. This shroud was GM #3938940 and was a SERVICE-only part number.

[Dale C.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

Joe
Just curious, did you find and put that 68 only idler pulley on the water pump belt? I found one but don't particularly want to go through all the trouble to put it on yet as it's running captured now. My car is also a 68 390 BB roadster with C-60 and a March 8th trim tage. I am also a bit confused about when and if the underdash braces were used. I have not seen any cars with them having a build prior to mine. The dating and insertion of what appears to be an added supplement makes the when and how a question mark. There also does not look to be enough room with a radio and ducting. See AIM UPC (1-BOLT WELD), (A6.5) and (A6.6) and (C60), (A9). My car has the supports shown on A6.5 but not the braces on A6.6. I did see the brace on that Pro Team L88 barn find but it would be a radio delete with no air. I also don't have the V shaped shims on the motor mounts, do you?
Maybe together we can figue this 68 beast out!
Dale

[Bryan M.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

Other Side.

Great pic Wayne! It looks like a 4-speed. How late is late? Is it a 300hp or 350hp? Do you have a pic of the idle solenoid set-up?

And do you know or anybody else know if the early 300hp and 350hp with a/c both used the metal shroud?

Thanks

[Wayne W.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

It is a 4 spd. serial number 20746.

Dont know about the metal shroud for AC cars, but I do think some BBs had metal. I am looking for that.

[Joseph M.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

Wayne,

Thanks for the nice pictures! You are right on about the upper air dam. It appears that from all of the feedback that I do have the correct AC core support for my car but for some reason the remaining three shroud holes need to be drilled which is no big deal.

Thanks!
Joe

[Bryan M.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

Wayne,

Thanks for the nice pictures! You are right on about the upper air dam. It appears that from all of the feedback that I do have the correct AC core support for my car but for some reason the remaining three shroud holes need to be drilled which is no big deal.

Thanks!
Joe

I think after drilling the holes for the big block shroud all you'll need is the big block hood air dam. I know Doc Rebuild list them for sale.

[Joe L.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

It's too late for me to edit the post, but I noticed a significant error in my third post to this thread (#15). In the first two sentences of my response, please change the word "shroud" to the word "support" everywhere it appears in these sentences. For some unknown reason, I make this error from time-to-time when discussing "supports" and "shrouds" even though I'm quite familiar with the fact that they're completely different parts. I suppose it's because the both begin with the letter "s".

[Joe L.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

It is a 4 spd. serial number 20746.

Dont know about the metal shroud for AC cars, but I do think some BBs had metal. I am looking for that.

Wayne-----


If you have anything to show that some big blocks used the round, metal shroud, I'd be very interested to see it. The only round, metal shroud I know of was the small block shroud. If this shroud was used for big blocks it would have put the fan blade completely into the shroud and it would have been virtually touching the AIR pump pulley, as well.

[Joseph M.]

Re: Correct AC Rad Core Support For 1968 427 390HP?

Dale,

I actually did pick up a new idler pulley assembly and installed it and it works fine. As for the under dash brackets, not sure if you noticed in the earlier logs but my car started out as a non AC car, and I have invested a good deal of money to collect and install all of the lovely 68 only AC parts. Having the AIM manual and being an ex ASE Master certified mechanic I had no major problems converting it to the correct AC. So since my car in not a convertible and did not come with factory AC, it doesn't have the under dash brackets but for being an August 68 car, I would be interested to know if they belong on my car.