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  1. J

    BBC large oval port heads

    The way I understand it is the 781 of the 336781 casting numbers on my heads represent 119cc. Can someone please tell me if this is the case. If this is so then what does the 336 mean? Thanks again for all the info and ideas. Have a great HIGH HORSEPOWER new year.
  2. J

    High Performance Exhaust

    I have a 1989 Mercruiser for Cruiser 7.4 330HP that I am building this winter. It starts out with forged 30 over pistons Edelbrock rpm intake manifold and matching cam shaft, double roller timing chain. I swaped peanut heads and fitted it with GM large ovalport heads, roller rockers, and some...
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