the exhaust head flang that same i am lookin for a flang to build a hedder are they the same cuz i can only find a 13b one

 

12a and 13b are different, however you can modify either to work on either block.

13b-> 12a requires slicing flange between the two exhaust ports and removeing about 12 mm of metal. do not bother to reweld togethor it makes no differance.

12a->13b requires slicing mainfold in the between the two exhaust ports and spreading them apart the the same approximate amount, once again do not bother to try and weld them togethor, it will jsut cause warpage, and missalighnment.

kenn

 

thanks man