hood clearance

junior barns · 09-12-2010, 11:52 PM

how much hood clearance should there be and where to measure from off the carb??

SSDiv6 · 09-13-2010, 01:05 AM

Quote:

Originally Posted by junior barns

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

Thanks a bunch !!

Myron Piatek · 09-13-2010, 03:44 PM

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

Quote:

Originally Posted by Myron Piatek

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

Quote:

Originally Posted by SSDiv6

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...

art leong · 09-13-2010, 08:34 PM

I have about 2 feet LOL.
Hood scoop is of no use, air intake is out the bottom.

Mike Taylor 3601 · 09-13-2010, 09:26 PM

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

Quote:

Originally Posted by Mike Taylor 3601

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

09-12-2010, 11:52 PM	#1
junior barns Senior Member Join Date: Jun 2006 Posts: 541 Likes: 11 Liked 20 Times in 14 Posts	hood clearance how much hood clearance should there be and where to measure from off the carb??

09-13-2010, 12:39 PM	#3
junior barns Senior Member Join Date: Jun 2006 Posts: 541 Likes: 11 Liked 20 Times in 14 Posts	Re: hood clearance Thanks a bunch !!

09-13-2010, 03:44 PM	#4
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	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.

09-13-2010, 08:34 PM	#7
art leong VIP Member Join Date: Dec 2001 Location: Richmond Hill, Georgia Posts: 2,003 Likes: 0 Liked 1 Time in 1 Post	Re: hood clearance I have about 2 feet LOL. Hood scoop is of no use, air intake is out the bottom. __________________ Art Leong 2095 SS

09-13-2010, 09:26 PM	#8
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,348 Likes: 297 Liked 248 Times in 87 Posts	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