Mopar X Heads Vs J Heads. Web j heads are the best platform to start porting and doing mods to because the floor is different /better. Web the notable x and j heads (named for an x or j cast into the head near the spark plug hole) fall into the large port category, as do cylinder heads with 915 as the last three. Let's put it this way, i have heard of x and j heads on the same engine. Web there is a difference in combustion chamber between a j head and another j head, all in how they were cast. Web one of my buddies has a 71 duster 340 that came with large intake valve j heads, while my 72 340 rr came with. Web j heads are just later castings of the x. That's basically what the test data shows. Web a brief description of 894 x heads, and 915 j heads. Some of them came with 2.02 valves on later 340s, but most came on.
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Web a brief description of 894 x heads, and 915 j heads. Web j heads are just later castings of the x. Some of them came with 2.02 valves on later 340s, but most came on. Web there is a difference in combustion chamber between a j head and another j head, all in how they were cast. Web one of my buddies has a 71 duster 340 that came with large intake valve j heads, while my 72 340 rr came with. Web the notable x and j heads (named for an x or j cast into the head near the spark plug hole) fall into the large port category, as do cylinder heads with 915 as the last three. That's basically what the test data shows. Web j heads are the best platform to start porting and doing mods to because the floor is different /better. Let's put it this way, i have heard of x and j heads on the same engine.
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Mopar X Heads Vs J Heads Web there is a difference in combustion chamber between a j head and another j head, all in how they were cast. Web the notable x and j heads (named for an x or j cast into the head near the spark plug hole) fall into the large port category, as do cylinder heads with 915 as the last three. Let's put it this way, i have heard of x and j heads on the same engine. That's basically what the test data shows. Web one of my buddies has a 71 duster 340 that came with large intake valve j heads, while my 72 340 rr came with. Web a brief description of 894 x heads, and 915 j heads. Some of them came with 2.02 valves on later 340s, but most came on. Web there is a difference in combustion chamber between a j head and another j head, all in how they were cast. Web j heads are the best platform to start porting and doing mods to because the floor is different /better. Web j heads are just later castings of the x.