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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2013 Posts: 47 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 47 | Howdy all.
Working on the subject engine / exhaust combo in my 59 Burb. I want to go rams head exhaust manifolds. I just picked up a very inexpensive set of manifolds (3747038 and 3749965) that I believe are 1.9 inch. I'm not a high performance speedster. However, are these 1.9ers going to restrict my capabilities to a major degree?? Appreciate your input.
Thanks! Maddog | | | | | Joined: Feb 2004 Posts: 29,868 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,868 | Unless you're planning to run some outrageous RPM, I doubt if you'll notice any problems at all. I've run the small-pipe ram's horns on 350's at 6K+ RPM on the dyno, and they could have handled more speed easily. The big ones (2 1/2" pipes) were used on the 300 HP 327's and some of the high performance 350's, and it was difficult to tell the difference in performance between them and most of the headers we ran during dyno testing.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: May 2005 Posts: 1,624 Shop Shark | | Shop Shark Joined: May 2005 Posts: 1,624 | My buddy runs them on a somewhat hi-performance 350 and hasn't complained about anything except the "JetHot" coating not holding up.
Six volt guy living in a twelve volt world
| | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | I have also spent a lot of dyno time with sbc and had the same results Jerry mentioned. Dynos had mass air flow sensors for years before cars and something I've noticed is larger exhaust kills some low end torque. Horsepower is not really affected till high rpm range. I think the loss of some exhaust scavaging with the large manifold is the reason since the maf sensor shows a drop compared to the smaller manifold. All the readings are so small that they are insignificant on a street engine.
Evan
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