aluminum head swap on merc 500hp

http://www.youtube.com/watch?v=k86y7...6zmNom4rhNAJyA

part 2

http://www.youtube.com/watch?v=gob7y...6zmNom4rhNAJyA

part 3

http://www.youtube.com/watch?v=ho9bP...6zmNom4rhNAJyA

now for the fun...

http://www.youtube.com/watch?v=D18PW...6zmNom4rhNAJyA

http://www.youtube.com/watch?v=xaFdx...6zmNom4rhNAJyA

http://www.youtube.com/watch?v=nNMt-...6zmNom4rhNAJyA

http://www.youtube.com/watch?v=uTIBk...6zmNom4rhNAJyA

http://www.youtube.com/watch?v=HfT9p...6zmNom4rhNAJyA

http://www.youtube.com/watch?v=HAU5F...6zmNom4rhNAJyA

http://www.youtube.com/watch?v=dUdG-...6zmNom4rhNAJyA

http://www.youtube.com/watch?v=ZP3L5...6zmNom4rhNAJyA

http://www.youtube.com/watch?v=hKjAi...6zmNom4rhNAJyA

talk about bang for your buck,,,I netted 10 mph and 2 1/2 pitch sizes...
i changed the heads and carb... left the stock cam...
if you watched the videos, you seen the swap problems and gains...