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-   -   hood clearance (https://classracer.com/classforum/showthread.php?t=28402)

junior barns 09-12-2010 11:52 PM
hood clearance
 
how much hood clearance should there be and where to measure from off the carb??

SSDiv6 09-13-2010 01:05 AM
Re: hood clearance
 
Quote:
Originally Posted by junior barns (Post 210175)
how much hood clearance should there be and where to measure from off the carb??
Assuming the vent tube is the highest point in the carburetor, measure from the vent tube to the hood. Minimum from vent tube to hood 2.5".

junior barns 09-13-2010 12:39 PM
Re: hood clearance
 
Thanks a bunch !!

Myron Piatek 09-13-2010 03:44 PM
Re: hood clearance
 
The more, the better. But I have less than 1.5" with no apparent issues and that's with the air cleaner assembly removed! FWIW, I recently browsed through a book by Smokey Yunick and 3/4" was mentioned as being the absolute minimum. Don't know if some carb's are more sensitive than others. I have a Holley. Underhood airflow/turbulence may have an affect with a aircleaner baseplate being helpful.

SSDiv6 09-13-2010 04:54 PM
Re: hood clearance
 
Quote:
Originally Posted by Myron Piatek (Post 210322)
The more, the better. But I have less than 1.5" with no apparent issues and that's with the air cleaner assembly removed! FWIW, I recently browsed through a book by Smokey Yunick and 3/4" was mentioned as being the absolute minimum. Don't know if some carb's are more sensitive than others. I have a Holley. Underhood airflow/turbulence may have an affect with a aircleaner baseplate being helpful.
With early cars that have a lot of reinforcement under the hood, you can go with less. Later model hoods, and/or fiberglass hoods, can bow at high speeds reducing the clearance.

Jeff Lee 09-13-2010 07:34 PM
Re: hood clearance
 
Quote:
Originally Posted by SSDiv6 (Post 210348)
With early cars that have a lot of reinforcement under the hood, you can go with less. Later model hoods, and/or fiberglass hoods, can bow at high speeds reducing the clearance.
Oh, is that what it is. I always thought my ultra-powerful engine was sucking the hood in...:p

art leong 09-13-2010 08:34 PM
Re: hood clearance
 
I have about 2 feet LOL.
Hood scoop is of no use, air intake is out the bottom.

http://i203.photobucket.com/albums/a...SCAN0005-1.jpg

Mike Taylor 3601 09-13-2010 09:26 PM
Re: hood clearance
 
Art,
do you put flat hood for heads up or record runs?
So with that scoop do get asked if that things got a hemi?
Mike Taylor 3601

art leong 09-13-2010 09:57 PM
Re: hood clearance
 
Quote:
Originally Posted by Mike Taylor 3601 (Post 210442)
Art,
do you put flat hood for heads up or record runs?
So with that scoop do get asked if that things got a hemi?
Mike Taylor 3601
I have a flat hood, and some steel fenders ready to paint.
I predict I'll pickup half a second. Bring on the DP's and CJ's


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