I was wonderinfg if putting J30A4 head on J30A1 blocks would be sufficient for power increase than stock? With respect to 02AV6's post with the valve clearance issue for the J32A2 on both J30 and J35 blocks. (Much props to his work!) What should I look for in the tech manuals on the different numbers to allow the J30A4 heads on J30A1 block to work? I have service manuals for the Acura/Honda/Oddyssey (04). What issues should I be concerned with for my engine? I am also looking to increase low-end torque and hoping this would help. Any help would greatly be appreciated!!