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Old 03-16-2013, 03:10 PM
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Weiand 6-71 Install

Have a 454 on a 74 corvette with a unknown cam, pretty good lope, Stock compression and 14 vacuum at idle.
Id like to install a weiand 671 Blower.
I am using a 750 double pumper.
Any suggestions on carbs ect.
Car is doing 500+ right now.
I have already searched for many install in the archives and just thought id post here. Thanks in advance.

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Old 03-16-2013, 04:34 PM
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Look into boost indexing the power valve.

You might be able to get by with a edelbrock carb, many people do.
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Old 03-16-2013, 08:28 PM
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What do you think the "stock" compression ratio is? What heads, piston volume, etc? That would determine whether you can safely boost it and how much.
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Old 03-16-2013, 10:12 PM
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Just a guess, but if the motor is making 500+ now with a single 750 cfm carb, I would think you should check or know your compression ratio before bolting that thing on. You are going to need to know what your cam specs are. 750 cfm on a 454 seems small if you are making over 500 HP.
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Old 03-16-2013, 11:46 PM
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Thanks for the replies, stock compression for a 74 454 Oval port 781 heads, larger valves, dual springs 14 vac at idle, meth injection, 2 1/8 sidepipes.
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Old 03-17-2013, 12:06 AM
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How about you fill it with good racing fuel? Ditch the gizmo.
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Old 03-17-2013, 12:44 AM
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Until you know your actual c.r. (no one knows what motor that is, or what it came in originally, the year and head numbers don't help much) and other info on that motor, you're in the dark and can't make a plan, especially getting into the boosted category.

If it's bone stock, assuming relatively low compression, why the water/meth injection? Did you have it dyno-ed to come up with the 500 plus HP?
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Old 03-17-2013, 12:55 AM
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two 750 cfm holleys or two 750cfm edelbrocks

You want a low low 7.5:1 compression ratio.
High compression ratio will only allow very limited blower boost on pump gas.
8.5:1 or less.

If your 454 is 500hp now it is very unlikely a low compression motor.

If you want maximum performance with the blower get a blower friendly cam.
They tend to be wider LSA 112+ and often dual pattern design.
Crane cams has many off the shelf cams that fit this description and are blower friendly.

If the motor has a cast piston you really got to avoid detonation under boost.
Low engine compression ratio and boost retard for pump gas.
7psi or less boost. Do not get greedy with the boost or the timing under boost unless you are willing to put race gas in the tank.

Last edited by F-BIRD'88; 03-17-2013 at 01:02 AM.
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Old 03-17-2013, 07:29 PM
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Yes thanks for replies. i have done a supercharger install on my 95 lt-1.
So i have some experience with forced induction. if you look thru my library on photobucket the siad 454 motor is there. this engine was used on a race track and car is pretty well set up for it. i didnt get pictures of the oil pressurized tank on the motor.
Supercharging will not be ideal on this motor, but Im going to do it anyway for fun. Start of with dual calibrated 650 or 750 holleys ect.http://i261.photobucket.com/albums/i...lenema/sc1.jpg My 1995 install.

http://s261.beta.photobucket.com/user/illenema/library/

Hers an inspection report on the car if interestedhttp://www.inspectmyride.com/Conditi...aspx?i=4482597

Last edited by illenema; 03-17-2013 at 07:47 PM. Reason: pictures
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Old 03-17-2013, 08:24 PM
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Seems like you already knew what you wanted. Good luck.
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Old 03-18-2013, 01:51 PM
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Thanks for informational posts!
This engine has all kinds of power, I might just wait.
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