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Username Post: 2-1/2 manifolds for a 78 (again)        (Topic#357260)
Jim.Biron 
"12th Year" Platinum Supporting Member
Posts: 3025
Jim.Biron
Age: 68
Loc: Monterey, TN
Reg: 04-10-08
07-17-19 08:37 AM - Post#2770903    

Can anyone tell me if these will work as a direct bolt on on a 78? I'm just not sure on the front end A/C, alternator etc hook ups. Nothing bolts on the to the headers like the old days, correct?
https://www.summitracing.com/parts/sum-g9200s

Jim
www.HudsonValleyCruise.com


 




TAT_2 
"18th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 35975

Age: 66
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
07-17-19 03:01 PM - Post#2770929    
    In response to Jim.Biron

FROM THE PICS,IT LOOKS LIKE A "STOCK" EXHAUST,THE ONLY DIFFERENCE IS THE HEADER TYPE FLANGE.I KNOW THAT WONT BOLT TO A STOCK EXHAUST SO THAT WILL HAVE TO BE CUSTOM MADE. I USED HOOKER HEADERS ON MY 78.
THERES A QUESTION SECTION THERE,SO I WOULD ASK TO BE SURE
BTW,DID YA BUY A 78 ?

09 PONTIAC- VIBE
08 PONTIAC- G6
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


*****
PREVIOUS VETTE'S 58,68,70,76,78,85,90
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Blessed are the cross-eyed, for they will see God twice


 
Jim.Biron 
"12th Year" Platinum Supporting Member
Posts: 3025
Jim.Biron
Age: 68
Loc: Monterey, TN
Reg: 04-10-08
07-18-19 03:33 AM - Post#2770961    
    In response to TAT_2

  • TAT_2 Said:
FROM THE PICS,IT LOOKS LIKE A "STOCK" EXHAUST,THE ONLY DIFFERENCE IS THE HEADER TYPE FLANGE.I KNOW THAT WONT BOLT TO A STOCK EXHAUST SO THAT WILL HAVE TO BE CUSTOM MADE. I USED HOOKER HEADERS ON MY 78.
THERES A QUESTION SECTION THERE,SO I WOULD ASK TO BE SURE
BTW,DID YA BUY A 78 ?




When you say stock exhaust won’t bolt to header flange do you mean size 2 bs 2-1/2 or do you mean bolt pattern? I would think bolt pattern would be the same just larger diameter.

Jim
www.HudsonValleyCruise.com


 
TAT_2 
"18th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 35975

Age: 66
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
07-18-19 03:34 PM - Post#2771003    
    In response to Jim.Biron

I DONT KNOW WHAT SIZE YOUR EXHAUST IS NOW. SO IF YOUR GOING TO GO DUAL EXHAUST YOUR GONA HAVE TO GO CUSTOM.THE STOCK GOES INTO A Y THEN THE CAT.OUT THE CAT INTO ANOTHER Y TO THE MUFFLERS.

AS YOU CAN SEE THE EXHAUST IS PRETTY RESTRICTIVE.
THATS WHY I WENT WITH HEADERS & CONVERTED TO DUAL EXHAUST WITH NO MUFFLERS.
[image][/image]
SINCE I WAS DOING THE EXHAUST,I THREW IN A HURST SHIFTER
[image][/image]

09 PONTIAC- VIBE
08 PONTIAC- G6
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


*****
PREVIOUS VETTE'S 58,68,70,76,78,85,90
*****


Blessed are the cross-eyed, for they will see God twice


 
Jim.Biron 
"12th Year" Platinum Supporting Member
Posts: 3025
Jim.Biron
Age: 68
Loc: Monterey, TN
Reg: 04-10-08
07-21-19 08:35 AM - Post#2771220    
    In response to TAT_2

  • TAT_2 Said:
I DONT KNOW WHAT SIZE YOUR EXHAUST IS NOW. SO IF YOUR GOING TO GO DUAL EXHAUST YOUR GONA HAVE TO GO CUSTOM.THE STOCK GOES INTO A Y THEN THE CAT.OUT THE CAT INTO ANOTHER Y TO THE MUFFLERS.

AS YOU CAN SEE THE EXHAUST IS PRETTY RESTRICTIVE.
THATS WHY I WENT WITH HEADERS & CONVERTED TO DUAL EXHAUST WITH NO MUFFLERS.
[image][/image]
SINCE I WAS DOING THE EXHAUST,I THREW IN A HURST SHIFTER
[image][/image]




What I'm considering is a cast iron replacement of the 2" exhaust manifold with a 2-1/2 inch 'stock looking' cast iron exhaust manifold. The question is this... Will an aftermarket Rams Horn 2-1/2 manifold bolt into a 78 corvette considering the type of setup the a/c, alt and air pump?

Did you have to make special brackets using headers or are the alt. a/c and air pump bolted to the engine and not the headers?


Jim
www.HudsonValleyCruise.com


 
TAT_2 
"18th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 35975

Age: 66
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
07-21-19 04:58 PM - Post#2771244    
    In response to Jim.Biron

Did you have to make special brackets using headers or are the alt. a/c and air pump bolted to the engine and not the headers?
MY INTENTIONS WERE DIFFERENT,I REMOVED THE AC COMP,LINES & CONDENSOR.I WANTED MORE AIR FLOW TO THE RAD.REMOVED THE SMOG STUFF ETC.I WASNT GOING FOR THE STOCK LOOK. IM GETTING READY FOR WORK SO ILL CATCH YA LATER.

09 PONTIAC- VIBE
08 PONTIAC- G6
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


*****
PREVIOUS VETTE'S 58,68,70,76,78,85,90
*****


Blessed are the cross-eyed, for they will see God twice


 
TAT_2 
"18th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 35975

Age: 66
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
07-22-19 02:03 PM - Post#2771321    
    In response to TAT_2

https://www.corvetteforum.com/forums/c3-tech-perfo...
YA MIGHT WANT TO READ THRU THAT,I WAS A MEMBER THERE BUT GOT BANED 4LIFE SO I CANT ASK.
YA CAN JOIN UP IF YA WANT,THATS ABOUT THE MOST ACTIVE VETTE BOARD ON THE NET.POSSIBLY SOME1 DID THE EXACT SAME THING TO U WANT TO DO.

09 PONTIAC- VIBE
08 PONTIAC- G6
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


*****
PREVIOUS VETTE'S 58,68,70,76,78,85,90
*****


Blessed are the cross-eyed, for they will see God twice


 
Jim.Biron 
"12th Year" Platinum Supporting Member
Posts: 3025
Jim.Biron
Age: 68
Loc: Monterey, TN
Reg: 04-10-08
07-29-19 07:24 AM - Post#2771898    
    In response to Jim.Biron

  • Jim.Biron Said:
  • TAT_2 Said:
FROM THE PICS,IT LOOKS LIKE A "STOCK" EXHAUST,THE ONLY DIFFERENCE IS THE HEADER TYPE FLANGE.I KNOW THAT WONT BOLT TO A STOCK EXHAUST SO THAT WILL HAVE TO BE CUSTOM MADE. I USED HOOKER HEADERS ON MY 78.
THERES A QUESTION SECTION THERE,SO I WOULD ASK TO BE SURE
BTW,DID YA BUY A 78 ?



After a close inspection of the manifold I finally get it. Thanks.


When you say stock exhaust won’t bolt to header flange do you mean size 2 bs 2-1/2 or do you mean bolt pattern? I would think bolt pattern would be the same just larger diameter.




Jim
www.HudsonValleyCruise.com


 
TAT_2 
"18th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 35975

Age: 66
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
08-13-19 03:14 PM - Post#2773158    
    In response to Jim.Biron

SORRY FOR THE LATE REPLY.
IF YOUR GONA USE THE 2'' MANIFOLDS YOUR GONA HAVE TO GO TO 2'' PIPES.I DONT KNOW IF A DUAL EXHAUST FROM A EARLIER YEAR WILL FIT OR WORK. YOUR GONA HAVE TO LOOK AT YOUR CROSS MEMBER & SEE IF THATS FEASIBLE ALSO. I HAD A X MEMBER THAT WOULD WORK & WAS "BOLTED" TO THE FRAME,SOME ARE WELDED I AM TOLD.
FROM WHAT I RECALL THERES A SPRING OR VACUUM OPERATED HEAT RISER VALVE ON THE PASS SIDE.YOUR GONA HAVE TO DEAL WITH THAT ALSO.

09 PONTIAC- VIBE
08 PONTIAC- G6
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


*****
PREVIOUS VETTE'S 58,68,70,76,78,85,90
*****


Blessed are the cross-eyed, for they will see God twice


 




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