Hey, i have a guy trying to sell me arp headbolts and he said that they will fit both the 420a and 4g63. Here is the email.
"These are left over from a build we did several months ago. They were ordered for a 420 turbo build up. I contacted ARP direct & spoke with their tech support. I was told by their tech that they will work for both. The part # 207-4203 which is a 4g63 application. I also questioned using them in both, But I am sure that someone from ARP is smarter than me."
#92173, "RE: Arp head bolts same for 420a and 4g63?" In response to Reply # 3
Originally posted by Blizare
Originally posted by XMasta19 were all the answers in your exact same thread on dsmtuners not enough convincing for you
Apparently not I guess.
Nope. Not even after myself and Old Mitsu Tech said the same thing. If Mitsu uses two different sizes of studs on the 4G63 based on the main, why would it be the same as the 420A, which is made by Dodge.