Description: What? There was no Heavy Duty M-21? Well you are wrong! There was such a creature and they only came out behind Pontiac Firebreathing 428 High Output Engines with 3:73 or numerically higher gears!
What? There was no Heavy Duty M-21? Well you are wrong! There was such a creature and they only came out behind Pontiac Firebreathing 428 High Output Engines with 3:73 or numerically higher gears!
