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Old 09-13-2006, 10:41 AM
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tunnel ram question?

i just purchused a dual weiland tunnel ram setup for my 79 corvette with two holley 450 cfm carbs. i was wandering how and what can i get to get the most horse power out of the set up and also was it a good idea to purchase the tunnel ram and if so how much of a gain in hp am i looking at. thanks

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Old 09-13-2006, 10:44 AM
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also what kind of stall should i run with it, it is a 350 thanks
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Old 09-13-2006, 10:53 AM
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No way of telling on either point. Put it together and hope for the best, make changes as necessary.
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Old 09-13-2006, 10:58 AM
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If you could post the other specs of the motor, cam, heads, compression, previous intake... We may be able to at least tell you if the new intake is a good match or not.

Adam
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Old 09-13-2006, 01:52 PM
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IMO, I think you will lose HP. Assuming your engine is stock or close to it, this is not the right manifold or set-up. An engine must be pretty modified in order to make the right use of a tunnel-ram and the carb set-up you have
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Old 09-13-2006, 02:02 PM
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for a tunnel ram I would recomend ported heads, higher ratio rockers, and headers with dual exhaust at a MINIMUM. A cam swap would be great too. You can run it on a stock stall, but it'd be better with a 2500 or so on the street.
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Old 09-13-2006, 02:45 PM
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There are a lot of other factors to concider but generally a tunnel ram setup is going to move your power band way up and unless you have the cam and stall converter and other parts to support you will probably be very dissapointed
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Old 09-13-2006, 02:49 PM
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with a tunnel ram you will most likely find the power @ 2500 -7000 range, they are thirsty, but they are also cool as hell ............ I'd put it on. regarding the stall converter at least a 2500, I personally run a 3400 that I like very much. (B&M hole shot)
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Old 09-13-2006, 04:12 PM
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How you going to smog a 79 Corvette in California with a tunnel ram and 2 4's on it was my first thought ????????????
Gene
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Old 09-18-2006, 12:51 PM
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smog response

i know people that own a smog station and they will pass me and also in 2009 the car will be considerded a classic.
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Old 09-18-2006, 03:28 PM
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Well, that certianly helps at smog time. Are you sure about the classic thing, I checked into that several years ago for a 69 Chevelle , I could get the classic plates for it but it wouldn't get me around the smog check law at the time.
Also I had a 69 Z/28 many years ago that I put a tunnel ram and two 500cfm Holleys on and ran for awhile, the extra gas was starting to wash the rings out so I took it off and put the Z/28 single 4 and stock manifold back on
and also made it easier and more pleasent to drive.
You going to cut a hole in your hood ? That will be costly when you take the tunnel ram off someday.

Been There , Done That
Gene
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Old 09-18-2006, 08:54 PM
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If your talking about the smog exempt law they capped it off at 74. Now they are trying to go back as far as 67. Just because your car doesnt have to pass the test its still illegal to mess with the emissions stuff. If you get pulled over the cop can send you to the ref if he feals like it. I know a cop tried to send me to the ref for not having cats on my 69 nova. The ref just laughed and signed it off.
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