Depending on which 4X heads you have using the 6X heads , the only thing your going to do is get some praticce in replacing heads. The heads were used for the same engine usage , to keep the compression down . Both set are going to give you about 7.8-8.2 compression so you won't be gaining anything. If you want better heads look for some # 12's, 13's, 96's or 48's but be aware that when you go up in compression you run the chance of spark knock. Your best bet is to save up & buy a good set of Alum. heads that way you won't have to worry when you go bigger. & faster as most end up doing.
|