Thumper Heads

willys1

Active Member
Dec 2, 2003
1,004
1
36
New Jersey
OK Guys,Im a newbee to 5.0's---3 months old!I havent been paying to much attention to the Heads and intake threads,now I starting to.Heres my ques.,Again, be patient,are thumper heads an after market head,or are they stock heads that, that guy thumper works on????