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Author Topic: 69 Z28 passenger exhaust manifold pic  (Read 6582 times)
jdv69z
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« Reply #45 on: November 15, 2013, 09:26:56 AM »

Here's a pic of my original on the bench. Hope it helps.
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Jimmy V.
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« Reply #46 on: November 15, 2013, 10:51:29 AM »

UPC-6, sheet C6....the Engine Section

Thanks..  I don't know how I missed that one *S*   and the sketch shows it's mounting consistent with the way JohnZ's is mounted in his photo...
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
69Z28-RS
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« Reply #47 on: November 15, 2013, 10:53:44 AM »

Here's a pic of my original on the bench. Hope it helps.

Jim, your heat riser is 'rotated' as shown in your photo, from that shown in the AIM and on JohnZ's engine..  There should only be 3 potential orientations, and one of those is likely impossible due to interference with the engine.  Either of the other two might 'work', but I think I'd go with what the AIm shows, all else being equal.
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
x77-69z28
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« Reply #48 on: November 15, 2013, 11:40:06 AM »

My 70Z has the heat riser in the same position as JDV69Z's I cut what was left of the original exhaust system off of the car during disassembly. The car had never been apart.
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69 x77 burnished brown, 711 int 05A bought in 78
67 rs/ss 350 butternut yellow 4 speed 2nd owner
70 Z28 forrest green, green int, M40, bk vinyl roof PROJECT
99 SS hugger orange 6spd NO TTOPS bought new 1 of 54
11 cts-v blk diamond  edition wagon 556hp sick!
JohnZ
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« Reply #49 on: November 15, 2013, 12:07:48 PM »

The heat riser valve in the photo in reply #30 appears to be installed upside-down; pushing the weight down (toward the ground) against spring pressure opens it, and that valve can't be pushed down because of the limit pin - it can only be pushed UP. The valve has a flat side, and a chamfered side - the flat side goes against the flat exhaust manifold outlet with a fire-ring gasket, and the chamfered side goes against the flared exhaust pipe with a "donut".
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'69 Z/28
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BULLITT65
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« Reply #50 on: November 15, 2013, 12:26:47 PM »

The weight points towards the firewall
Well thats what is debatable, JohnZ car it is pointed towards firewall, and it also shows that in the AIM. I have seen original cars with it both ways (weight pointed to the firewall, or pointed to the frame rail). It made me wonder if they switched the way they mounted them, Maybe later 69 cars have it pointed towards the firewall? or who was working that shift on the line when installing? Just a wild guess on my part.
Sorry, I mis typed. John Z car IT IS pointed towards the frame rail. Mine is pointed towards the firewall, I have seen it both ways on original cars. I am unsure if one is correct and the other is not.
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1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
Looking for an original LOF soft ray windshield
Looking for original Delco side post negative battery cable part # 6297651AV
BULLITT65
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« Reply #51 on: November 15, 2013, 12:42:01 PM »

The heat riser valve in the photo in reply #30 appears to be installed upside-down; pushing the weight down (toward the ground) against spring pressure opens it, and that valve can't be pushed down because of the limit pin - it can only be pushed UP. The valve has a flat side, and a chamfered side - the flat side goes against the flat exhaust manifold outlet with a fire-ring gasket, and the chamfered side goes against the flared exhaust pipe with a "donut".
John check out the pic in post 22 and then look again. It looks like it is installed just as it is shown in the picture (chamfered towards the flared exhaust, flat side towards manifold)
also looks like it is installed just like JDV's on the bench.
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1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
Looking for an original LOF soft ray windshield
Looking for original Delco side post negative battery cable part # 6297651AV
69Z28-RS
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« Reply #52 on: November 15, 2013, 03:40:13 PM »

the AIM only shows it one way... and the 'flat side MUST go up with the donut side down, towards the exhaust pipe....
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
BULLITT65
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« Reply #53 on: November 15, 2013, 03:50:20 PM »

I agree with the flat side must go toward the manifold, and donut side towards the exhaust pipe. I also agree that it could only go the 2 ways weight pointed towards the frame rail, or pointed towards the firewall. I think the only thing in question now is did the Z/28 leave the line with it only in the one position that is shown in the AIM, or was there a reason it may have been positioned toward the firewall or was it the line workers preference. OR all the original pictures I have and the one shown on the bench by JDV are the exception?
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1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
Looking for an original LOF soft ray windshield
Looking for original Delco side post negative battery cable part # 6297651AV
69Z28
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« Reply #54 on: November 15, 2013, 09:44:57 PM »

OK guys this is what I found on the 2 heat risers I have...It didn't dawn on me to look in the 1969 Impala A.I.M. I have so I just looked. The part number is 3887024. I Googled the number and found this link on ebay...

http://www.ebay.com/itm/NOS-GM-3887024-HEAT-RISER-1966-1967-1968-1975-CORVETTE-1971-Chevelle-SS-454-/181255491532?pt=Vintage_Car_Truck_Parts_Accessories&hash=item2a33ab4fcc&vxp=mtr#ht_3282wt_1007

I founds this as well that has what dates it was used on. I think someone else posted this link too. HR024 is the number and one above it is the small block valve HR023.

http://www.hamiltonmanufacturing.ca/hrv.htm


No clue who really makes them or if anybody does other then GM.
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GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28
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« Reply #55 on: November 15, 2013, 09:54:04 PM »

OER makes a repro part for a lot less money($69), that seems to match up pretty well (in external appearance and configuration) with the NOS one offered for $240..  This probably works for most 2" Camaro V8 systems.

http://www.ebay.com/itm/OER-Exhaust-Heat-Riser-Valve-2-0-in-Diameter-Chevy-GMC-Each-/190969149688?pt=Motors_Car_Truck_Parts_Accessories&hash=item2c76a5f8f8&vxp=mtr
« Last Edit: November 15, 2013, 11:37:09 PM by 69Z28-RS » Logged

Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
jdv69z
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« Reply #56 on: November 17, 2013, 09:59:02 AM »

The heat riser valve in the photo in reply #30 appears to be installed upside-down; pushing the weight down (toward the ground) against spring pressure opens it, and that valve can't be pushed down because of the limit pin - it can only be pushed UP. The valve has a flat side, and a chamfered side - the flat side goes against the flat exhaust manifold outlet with a fire-ring gasket, and the chamfered side goes against the flared exhaust pipe with a "donut".

I'll reverse it and try again.
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Jimmy V.
69Z28
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« Reply #57 on: November 17, 2013, 08:39:06 PM »

Hey guys, heat valve #3887023 is available from GMPartsDirect.com at $50.00 plus shipping if anyone is looking. I'll post pics when it comes in.
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GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28
69Z28
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« Reply #58 on: November 18, 2013, 05:47:57 PM »

Here's an update...GM part #3880723, heat riser valve, no longer available, it has been discontinued. Add that to the correct aluminum nose piece used on the 1108367 starter. Well, it's back to looking for a used one again.
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GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28
69Z28-RS
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« Reply #59 on: November 18, 2013, 08:40:27 PM »

I called my local chevy dealer ltoday; they didnít show this number on their books. Discontinued for a long while, but they checked other dealers, and found a few dealers who did show one in stock:   They gave me a couple of dealers that showed them in stock (but the price is a bit high).  I called both and confirmed they had ONE part each:
Athens, TX    gm part in gm box..  $95.20.      903-675-5115
Grayslake, Illinois   part on shelf   $95.20   847-223-9086
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
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