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Old 02-09-2010, 01:03 PM
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Good BBC Intake...?? Help

thanks in advance for any suggestions.
I have a Weiand Stealth and am looking at
the Edelbrock Perf RPM Air Gap. Which would
be the biggest benifit for street and maybe strip
a few times. I like and want in your seat off the line
torque.
Thanks
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Old 02-09-2010, 01:41 PM
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Doubt you'll notice much difference with just an intake swap
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Old 02-09-2010, 03:28 PM
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I agree 100%, if you ran the same engine on a dyno with the two mentioned manifolds you would most likely see the Air Gap making a few more ponies in the upper rpm bracket.
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Old 02-09-2010, 04:11 PM
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Not only do I agree as well, but I will can confirm.

I actually made this exact swap on my BBC a couple of years ago. My primary reason was to "pretty up" the engine compartment because the Weiand was looking kind of bad.

There was no noticeable difference in performance. I think you will need to get a little more extreme if you are looking for a power increase.
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Old 02-09-2010, 04:41 PM
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if you live in cold climate then you will hate the air gap intake due to very slow carb warmups which makes the engine stumble off line.

I hated mine and I live in south/central texas. If the temps drop below 50 or even 60, then it takes 20 to 30 minutes of driving to get the carb up to temperature. Plus I tended to drop things (nuts, bolts, tools, ect) under the carb which I also hated.

The RPM is a great intake. Just get the regular RPM intake (with the heat risers) and use the restrictors on the gasket.

But, you will most likely not notice much of a difference.

what cam, stall, gear, are you using?
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Old 02-09-2010, 04:53 PM
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BBC Intake Issues, 454C10 THANKS

This 454 is bone stock 1974. I have hooker super comps 2" primaries,
Wieand Stealth, old 780cfm, Muncie 4spd, 3:31's in a 12bolt -
65 Malibu. I have FlowTech headers 1-3/4" primaries I am getting rid of
the 2". All this started with 3 attempts to seal the Stealth. Now I have the
runnners sealed and the rear seal on the valley is leaking oil which means it is
leaking vacumn too. I did the carb cleaner test and the motor didn't rev or die. When I am on it from a stop it popps, jerks, spits, but seems if I keep my
foot in it it works through it and then gets with the program. Since I am going
to remove the Stealth to put new gaskets in another attempt I was just thinking of the Performer RPM and start freash. I kind of like the Stealth though.

Thanks for your help
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Old 02-10-2010, 07:45 AM
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how are you sealing the rear and front rails?

A 3/8" thick bead of RTV is all you should be using. So, don't use the rubber seals on the front and rear rails. After setting the intake down, let the rtv cure over night before starting.

I understand now why you are changing the intake. Yes, the rpm intake is a good choice even for low rpm power. But, I would avoid the air gap and get the regular rpm due to reasons listed above. Besides the regular rpm intake is cheaper. And make sure to get the square bore flange for the carb.
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Old 02-10-2010, 08:08 AM
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454C10, Intake Issues...Thanks

Thanks again. On my Stealth..the guy I got it from looks as though
he filed the front and rear of the intake at the valley seal areas. I like
the Stealth and may foot the bill to buy a brand new one so I know she
is good. Then change it out. Why do all the intake manufac. send front and
rear seals if the directions say to use hi-temp rvt?
Thanks
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Old 02-10-2010, 08:40 AM
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I have never got those seals to work right. RTV always works.

if you have been using the seals, then retry with a 3/8" thick rtv bead.

don't know why they put those seals in the box. no one uses them
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