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105581 Posts in 12330 Topics by 4753 Members
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286  Camaro Research Group Discussion / Originality / Re: Trunk and header emblem. on: November 14, 2013, 07:35:56 PM
I just picked these up and there is an identical set on ebay with the same numbers.
287  Camaro Research Group Discussion / Originality / Trunk and header emblem. on: November 14, 2013, 03:43:55 PM
Is there a difference between the trunk emblem and the header panel emblem for the first gen 68-69? I have 2 with separate numbers on the back of the "BY CHEVROLET" side. One emblem has PT. NO. 3916654  C-1, and the other emblem has 7752901    then a circle with something inside it and then a  2. I have seen both of these cast numbers surfing online but don't know much about them only to say the PT. NO. emblem says it's a 68-69 Camaro trunk/header panel emblem and nothing comes up on the other number. Weird, unless one of them is a reproduction?

 
288  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 14, 2013, 03:29:54 PM
Gary, something happened to my camera. All pics are coming up blank! It looks like johns z's, but the weight is to the outside parallel to the frame rails

That's OK. Is the block on the end of the lever pointing to the front of the car or the firewall? Something I have been wondering about is was the heat riser just installed in any position even at the plant? and was there different ones. 
289  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 14, 2013, 01:36:54 PM
Anything at this point will do. I need to figure out what others have so I can determine if I need to keep looking for the right heat riser of what I have is correct too.
290  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 13, 2013, 09:01:58 PM
Compared to this pic the 2 I have are wrong then. Unless other members show a clear view of an original I guess we'll never really know. Can anyone confirm what is correct? So far JohnZ has the best overall view that would be the same as the pic. $240.00...that's a load of change. I paid $5.00 a piece for the ones I have. I'll just keep digging. The right one is bound to pop up.

Anybody have any idea what the cast # 3746844 heat riser goes to?
291  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 13, 2013, 02:40:53 PM
OK. Just got the other one in today. Same as the one I already have. Still think both are wrong for the 69 Camaro Z28. Anybody else have a known good heat riser valve for a 69 Z28?
292  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 11, 2013, 08:41:26 PM
One '68 327 I had, had the weight parallel to pass frame rail with counterweight to the front.
I would think the valve would be universal fit as it would match manifold ID.
A '64 Impala 327-300HP, ram horn manifold had the weight to the rear of manifold.

Hey Everett like what's in this pic. LM1 350/255 69 Impala. The one I have in hand and the one I'll be be getting in a few days are exactly like what's in my 69 Impala in this pic.
293  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 11, 2013, 08:18:23 PM
Gary, my 69 is still running hooker headers, but I just looked at my exhaust manifolds for the 70 Z project. I cut off what was left of the original exhaust. My heat riser has the weight to the outside, parallel with the frame rail. Being 57, I can't post pictures. I can email them to you.
Buddy


I sent it to you in the PM you sent Buddy. Can we assume the 70's were the same?
294  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 11, 2013, 05:02:18 PM
Does the big block and the small block share the same heat valve? I wonder if I have one for a BB. Huh!?
295  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 11, 2013, 01:31:55 PM
Yes, this is confusing, and  both valves are identical. My reply #3 and #8 show the valve flat side up on the one sitting on my desk and the heat valve in my reply #9 is flange side up and is the valve I just bought and haven't received yet, and for what it's worth is identical to the one I already have. Without anything to go by it's going to be hard to verify if what I have is even a correct heat valve for the 69 Small block. Nothing to go by if there is no other participation from other members. Just need a good clear pic of this heat valve and it's orientation. I think what I have may be for the Rams Horn style exhaust manifolds like what's on my 69 350 Impala. IDK.
296  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 11, 2013, 01:11:49 PM
The heat valve isn't reversible so it won't work that way, the donut gasket/ flange side faces down towards the ground so it seals the head pipe to the heat valve. The flat side mates to the manifold outlet and has a flat gasket to seal any leaks at that connection. Can't seem to find any pics or maybe a diagram showing how this is set up in general terms. Went thru the 69 A.I.M. and haven't seen anything there either. Every body must be using headers on there cars. I would have thought there would be more replies. Anybody else have something to verify correctness?
297  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 10, 2013, 06:01:39 PM
Here's the flange side of the one I just bought. Number on the lever is 3746844. Is this even a good number for the 69 small block? You can clearly see it's the same if you flip it flange side down. I have seen this number too, 7752901, but don't know much about it. One forum I found that on says correct for 69 Z28 but heck IDK.
298  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 10, 2013, 05:40:53 PM
Hey Gary, let me start off by saying my exhaust system was replaced at one point so someone could have rotated my valve. But looking at your picture if you flip it over and look at John Z pic you would have it in the same position as his. For my car if you flipped it over and then turned it a 1/3 of a turn clockwise it would be how mine is installed.

So from what I see John and I have it facing the other way and John has the weight down, you rotate it 1/3 clockwise, and the weight would be up, like mine is (you just can't see it in the photo sorry).  If you look at the peg that the spring is retained by in my pics you may see what I am saying.

There might be someone on the CRG that has a V-8 Camaro with the original pipes and valve still installed on there car that may give us more insight. Maybe one of those original small block pace car guys could post a pic?


But you can't flip it over, that puts the flange/donut side facing up which isn't correct. If I install mine as it is shown in this pic here then the lever will be facing the rad support/front of car compared to what Johns pic shows facing the fender well. No matter how I orient this particular valve it will never be correct based on yours and Johns pic. Looking at my pic the wire spring will be up, I bet yours and Johns is underneath and cannot be clearly seen. I'm still thinking I have the wrong valve not to mention the one I just bought will be wrong too. How many variations can there be. Geeze.
299  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 10, 2013, 03:19:45 PM
In Post 3, the side shown mates with the manifold via a gasket.
The bevel side underneath, mates with the exhaust pipe donut.


Yes that is correct but what I can't 'SEEM' to wrap around my head is if what I have is correct or not. The survivor 69 Impala I have has the same valve in my pic, post #3, with Rams horn manifolds, which appears to be different then the valve in Johns pic. The weight on mine as installed will be on the left as Johns is on the right. I guess what I'm trying to figure out is does it matter how it's clocked and a proper installation for 69 Z and/or small blocks? I think what we need are pics of original installations as stated by Bullitt to verify what is correct. I don't know what is correct.
300  Camaro Research Group Discussion / Originality / Re: 69 Z28 passenger exhaust manifold pic on: November 10, 2013, 02:53:08 PM
I didn't have a valve before I bought the one in my pic. The seller said it came from a 70 Corvette, but I have no clue really. Are these valves made different from model to model and/or from Rams horn manifolds to log type manifolds? I just bought another valve  which says it is number 3746844 and not even sure it is correct. Here's a link to the one I just bought. I still don't think I'll have the correct one to install.

http://www.ebay.com/itm/vintage-chevy-exhaust-small-block-heat-riser-3746844-with-diamond-up-engraved-/310785661240?_trksid=p2047675.l2557&ssPageName=STRK%3AMEWNX%3AIT&nma=true&si=vRtriaDfWUccNfL9O0OoOVL9V3A%253D&orig_cvip=true&rt=nc
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