boring my 318

flyfish said
Just a little “real world” experience you may be interested in. I had a 318 with ported J heads and a MP 284/.484 cam in my Barracuda years ago. I was told by a local Mopar “expert” that the 302 head was the way to go for even better performance…so I bought a set of 302’s and gave them a shot (nothing else was changed). The daily driver feel was much better with a definite increase in low end torque, but the high RPM horse power was just not there. I took the car the track and found that the 302’s made the car slow down by 6 tenths and 4 MPH in the quarter mile! After realizing that I just spent 500 bucks to slow my car down, I promptly removed the 302’s, and sold them to someone that was rebuilding a truck motor.

Just something to think about if you plan on going for more than just “daily driver” performance.
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flyfish you stated that you were running ported j heads and switched to the 302 heads. the performance dropped on the top end. what if anything was done to the 302 heads? were they as cast or were they treated to a port job or any kind of valve job as well? what intake was used on the car? if it was a intake geared for the 360 heads then there would have been a port matching problem for the 302 heads. these factors would cause the loss on the top end. i am just trying to get an apples to apples comparison here.....