Oldsmobile 350 Dual Exhausts in a 80 G Body El Cam!no

jwobbles07

jwobbles07

Not-quite-so-new-guy
Dec 14, 2018
22
27
13
Los Alamos, NM
#21
Following. I have an 81 Malibu wagon with the olds 403 and need to do the same thing.
 
ssn696

ssn696

Comic Book Super Hero
Supporting Member
Jul 19, 2009
3,582
2,424
113
New Mexico
#22
You can offset the cost of the exhaust system by using a Summit or Jegs G-body dual kit, both of which are mandrel-bent. The Summit kit is made by Heartthrob in Minnesota, so if you are a Made in USA fan, I recommend that kit over Jegs which is 'imported'. I have to go back an review your threads, but I am guessing that you are keeping the BOP transmission that was behind the 3.8. If so, the TH350 dual-hump crossmember should fit just fine and enable the true duals. The remaining expense is custom-bending manifold extensions to match your Olds. Maybe Chuck and JWobble can collaborate. Fewer custom exhaust shops in New Mexico....
 
pagrunt

pagrunt

Comic Book Super Hero
Sep 14, 2014
3,784
4,304
113
Shelocta, Pa
#23
The Summit kit is made by Heartthrob in Minnesota, so if you are a Made in USA fan, I recommend that kit over Jegs which is 'imported'.
From everything I came across checking in on the Jegs kit last year it's a Heartthrob kit. All three use the same "test" car pics & instructions for the kits.
 
ssn696

ssn696

Comic Book Super Hero
Supporting Member
Jul 19, 2009
3,582
2,424
113
New Mexico
#24
Ah. I spoke to the Heartthrob folks about a dual kit for the K10, having bought similar systems via JC Whitney 15-20 years ago. I mentioned the G-body kits, whether they could make me behind-the-wheel tailpipes. The guy laughed and said, WE made those for Summit and Jegs, though Jegs is now getting them overseas.
 
C

csstrux

Greasemonkey
Apr 5, 2017
124
58
28
#25
I got a set of Sanderson headers, a Pypes regal style 2.5" system and tied in the drops. Took a double hump crossmember with a slight modification, elongated the slot for the trans. 82 cutlass with Olds power 200R4 combo. I played at it and still had it in in a day.
 
Chuck Cole

Chuck Cole

Apprentice
May 10, 2017
75
47
18
Granite Falls, WA
#26
I had the custom 2" duals off my 70S Cutlass with manifolds, off a 260 on my 88 Cutlass. I actually had an all 2.5" custom downpipes into a compact X pipe, in place of the Y pipe, into a Hooker G body cat back system, all through the passenger side hump. It was with Sanderson shorty headers but manifolds have similar placement. I actually have it off in my shop, so I can take pics. I put the 2" duals and manifolds back on the Olds 350 in my 70S. The 2.5" was droning and blah on the 70 Cutlass, sounded amazing on my 88, which is why it is going back on. Plus it made a big difference in the higher rpms on the Olds 260 in my 88 Cutlass. You could try the Ramair Restorations 2.5" downpipes with manifolds, work with A and F bodies. A G body is tighter by the A arms and nearly everywhere else. Good luck.
I have it from a good source NOT to use 2.5, but rather 2 or 2.25 so that makes it much better. The entire part of this project was to get the rumble of the W31 and W30 with twice pipes. I'm following the 68 system and plugging it into the 80 El Camino as I can. The mufflers and bells are definitely going to be OEM for 1968. The 442's were 2"
 
olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
4,380
2,160
113
Melville,Saskatchewan
#27
I believe the factory 442 is 2.25" down pipes into 2" tail pipes. My dual 2" sounds good but definitely kills top end power.
 
Chuck Cole

Chuck Cole

Apprentice
May 10, 2017
75
47
18
Granite Falls, WA
#28
The top end of mine is probably 80 since I don't go much beyond passing. For me that blub blub sound at idle is worth the sacrifices :D
 
Chuck Cole

Chuck Cole

Apprentice
May 10, 2017
75
47
18
Granite Falls, WA
#29
I got a set of Sanderson headers, a Pypes regal style 2.5" system and tied in the drops. Took a double hump crossmember with a slight modification, elongated the slot for the trans. 82 cutlass with Olds power 200R4 combo. I played at it and still had it in in a day.
That's good info. I will spend some time in catalogs to save ...My project is over $6K now and my wife is threatening to stay! :)
 
Chuck Cole

Chuck Cole

Apprentice
May 10, 2017
75
47
18
Granite Falls, WA
#30
Ah. I spoke to the Heartthrob folks about a dual kit for the K10, having bought similar systems via JC Whitney 15-20 years ago. I mentioned the G-body kits, whether they could make me behind-the-wheel tailpipes. The guy laughed and said, WE made those for Summit and Jegs, though Jegs is now getting them overseas.
Heartthrob...is that the woodpecker smoking a cigar?
 

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