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Jul 21st, 2025 | | | | Joined: Oct 2009 Posts: 33 Apprentice | | Apprentice Joined: Oct 2009 Posts: 33 | I am building a Two ton flatbed with a 1986 292 engine with an Offy intake, 4bbl carb, and headers. It sounds great with 18" exhaust pipes on it! I am planning to keep it as a dual exhaust system with Smithys mufflers. Will it perform alright or should I join them into one muffler?
Mark | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Duals for sure. You can run long glasspacks & they are not too loud.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Oct 2009 Posts: 33 Apprentice | | Apprentice Joined: Oct 2009 Posts: 33 | Thank you Wrenchbender! I know that I will love the sound, I just wanted to see if somone had evidence that performance or mileage would suffer from not having all six cylinders flowing out of one pipe.
Beautiful fleet of trucks by the way. I love '58 Chevy trucks. It is my favorite year from that era.
I am putting a '33 cab on my '53 chassis so this one will look pretty cool.
Mark | | | | | Joined: Dec 2008 Posts: 1,915 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,915 | The rule for racing L6 was to keep the front and rear cylinder groups separated as long as possible.
A single pipe after that would be harmless, but of course would have to be bigger, clearance problems, etc. 2 × 2" 18 gauge pipes = about 2-3/4", etc. | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | On the Austin-Healey 3000 we used to race, there was a split manifold with big pipes back to a single muffler, with two pipes in and out. Just taking the muffler/tailpipe assembly off gave us a tuned-length header for racing. Sounds like it was designed that way, dontcha think? I believe the Jag XKE was set up the same way.
Jerry
Last edited by Hotrod Lincoln; 01/25/2010 2:41 PM.
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| | | | | Joined: Feb 2009 Posts: 400 'Bolter | | 'Bolter Joined: Feb 2009 Posts: 400 | You could check with Speedway out of Nebraska,they should be able to inform you about lenght,diameter,back pressure,and preformance. | | | | | Joined: Mar 2005 Posts: 637 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 637 | Dual exhausts on a straight 6 may or may not make more Horsepower, but you think it does 'cause it sounds so much better
| | | | | Joined: Oct 2009 Posts: 33 Apprentice | | Apprentice Joined: Oct 2009 Posts: 33 | It does sound really good! I installed Smithy's mufflers and she purrs like a kitten. No idea if I will see improved performane since this is the first time I will ride behind this engine. However, I am sure I will like it and that is what counts with Big Bolts.
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