300 intake manifold
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Senior User
Joined: Dec 2013
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From: Bakersfield,CA
300 intake manifold
Tried to mount a Holley 1940 carburetor from a 1965 300 on a 1982 300 intake manifold.
Thought all the carburetor style intake manifolds were all equal,
The bolt pattern on the 82 does not match the Holley 1940.
Center to center bolt pattern on the 65 is 2.7".
Center to center bolt pattern on the 82 is 2.9".
At some time the stud spacing was changed from 2.7" to 2.9" to accommodate the YF & YFA carburetor.
Have an intake manifold from a 1979 300 with 2.9" dimension.
What year was the intake manifold carburetor bolt pattern changed from 2.7" to 2.9" ?
Thought all the carburetor style intake manifolds were all equal,
The bolt pattern on the 82 does not match the Holley 1940.
Center to center bolt pattern on the 65 is 2.7".
Center to center bolt pattern on the 82 is 2.9".
At some time the stud spacing was changed from 2.7" to 2.9" to accommodate the YF & YFA carburetor.
Have an intake manifold from a 1979 300 with 2.9" dimension.
What year was the intake manifold carburetor bolt pattern changed from 2.7" to 2.9" ?
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
Not sure of the answer to the question of when, but it is easy to adjust the spacing. I've done it and it takes about 15 minutes of light labor.
Take the "old" carburetor with the narrow spacing and lay the carburetor to EGR adapter gasket on the base of the carburetor, centering the large hole with the carburetor's throat. You will easily see how much material needs to be removed... just a little. Use a felt marker and mark the outer edges of the two mounting holes. With a small "rat tail" [round] file, hand file in the marked areas, being careful not to let the filings get inside the carburetor. Keep checking with the gasket and in about 15 minutes, you will be ready to mount the carburetor!
Take the "old" carburetor with the narrow spacing and lay the carburetor to EGR adapter gasket on the base of the carburetor, centering the large hole with the carburetor's throat. You will easily see how much material needs to be removed... just a little. Use a felt marker and mark the outer edges of the two mounting holes. With a small "rat tail" [round] file, hand file in the marked areas, being careful not to let the filings get inside the carburetor. Keep checking with the gasket and in about 15 minutes, you will be ready to mount the carburetor!
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Senior User
Joined: Dec 2013
Posts: 348
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From: Bakersfield,CA
Have a YFA stock carburetor with pot metal base used on later years that has factory slotted holes to match both the early narrow bolt hole "football" flange pattern and later wider bolt hole pattern.
Some reserach indicates the Holley 1940 was used on 240 & 300 from 1965-1969.
Some reserach indicates the Holley 1940 was used on 240 & 300 from 1965-1969.
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