No previous thread.
Thumpr series is: thumpr, muthathumpr and big muthathumpr...this was the smallest thumpr, 227-241@ .050.
Pistons are KB flattops.
Mild bowl work, just what you see in the pics with a good valve job and backcut on intake.
No other port work or mods were done. Very basic build, with good machine work and good parts (except maybe the stock rockers).
