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Old 11-16-2011, 06:09 PM
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671 Roots Blower

I originally was going for the small blower for my big block but a few of my friends convinced me to go to the 671 route on top of my 540 bbc. My question to all of you who have done this before, this is my first blown engine. I would like to know how far the carbs will stick past my stock hood. The hood in question is a 1973 Chevy C-10 full size pickup. I currently have a 4 inch hood scoop on my hood, will I need to increase the height when I place a 2 or 3 inch air cleaner on the carbs. I'm sure I'm not the first to do this and am hoping some of you could help me in this regard. Thanks for letting me post on your sight. Jeff

Last edited by formulas4ever; 11-16-2011 at 06:15 PM.
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Old 11-16-2011, 06:30 PM
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Quote:
Originally Posted by formulas4ever
I originally was going for the small blower for my big block but a few of my friends convinced me to go to the 671 route on top of my 540 bbc. My question to all of you who have done this before, this is my first blown engine. I would like to know how far the carbs will stick past my stock hood. The hood in question is a 1973 Chevy C-10 full size pickup. I currently have a 4 inch hood scoop on my hood, will I need to increase the height when I place a 2 or 3 inch air cleaner on the carbs. I'm sure I'm not the first to do this and am hoping some of you could help me in this regard. Thanks for letting me post on your sight. Jeff

On a 540 BBC, I think I would go with at least an 8-71.
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Old 11-16-2011, 07:04 PM
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Quote:
Originally Posted by GT23T
On a 540 BBC, I think I would go with at least an 8-71.

I would agree!!
I have a 6-71 but Mines a 383 sbc.
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Old 11-16-2011, 07:09 PM
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I used 2 electric leaf blowers and an inverter .
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Old 11-17-2011, 11:07 AM
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Here is a pic of my 74 c-10. You can get an idea how fa it will stick out. This is before I cut my hood.

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Old 11-17-2011, 06:38 PM
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Here is a pic of my 74 c-10. You can get an idea how fa it will stick out. This is before I cut my hood.


Very nice truck!!
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Old 11-17-2011, 06:49 PM
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roots blower

thanks this was most helpful. I knew I wasnt the first to do this, lol.
Anyway this is the best forum sight I have ever been on and I am on many. You guys are the friendliest and the most helpful, I'm so glad I stumbled onto your sight, thanks guys for all of your help, I'm very appreciative.
Thanks again, Jeff.
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Old 11-17-2011, 08:15 PM
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As a "newbie" to this site several years ago with my first seriously blown engine, you have come to the right spot. Before deciding on a 6:71 or 8:71, the experts on this site will want to know: crank forged or cast, pistons cast or forged, compression ratio, radiator size, engine timing, etc. In other words, putting on a blower above the 144 or 142 size ("yes", I ran these previously"), involves much more than just a bolt-on. I hasten to add it's all possible, so long as one secures, and listens to, expert advice. This is the place to get such advice on running a blown motor.
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Old 11-17-2011, 08:24 PM
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Very nice truck!!
Thank you very much, sir. I appreciate the compliment.
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Old 07-23-2013, 05:24 AM
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Yeah. The coyote called and said for you to contact him...
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Old 07-23-2013, 09:01 AM
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LOL


I know this thread is from 2011 but I wanted to point out that I have a 502 with a 871 & Dual Quads and with the cowl hood the carbs stick out this much....

Note
I switched from a Air Cleaner to a Hilborn Style Scoop (although mine is actually a vintage 1960 Mr Roadster Prototype Scoop)



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Old 07-25-2013, 07:51 PM
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Very, very nice. Love it.



Quote:
Originally Posted by ProStreetRob View Post
LOL


I know this thread is from 2011 but I wanted to point out that I have a 502 with a 871 & Dual Quads and with the cowl hood the carbs stick out this much....

Note
I switched from a Air Cleaner to a Hilborn Style Scoop (although mine is actually a vintage 1960 Mr Roadster Prototype Scoop)



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