hood clearance

[junior barns]

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

[SSDiv6]

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]

Thanks a bunch !!

[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.

[SSDiv6]

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]

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...