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-   -   Build a 420 hp engien with 781 heads??? (https://www.offshoreonly.com/forums/general-q/203182-build-420-hp-engien-781-heads.html)

KAAMA 02-15-2009 06:47 PM

JimV 616-889-0928

drpete3 02-16-2009 07:08 AM

great disregard the post in the other thread about his #

drpete3 02-16-2009 02:00 PM

I am going to have new valves put in. He wants to use 2" in/ 1.9" ex. Does this make sense?

change the rods to 7/16", forged pistons, flat top piston 9.0-9.5 comp, hyd cam and new manifolds (looking for some takeoffs)

should I still pocket port the heads?

KAAMA 02-16-2009 04:22 PM


Originally Posted by drpete3 (Post 2801364)
should I still pocket port the heads?

Absolutely!!! I thought that is what you originally called him for! (???)

Also, I think you mean 2.19" intake valves and 1.85" or 1.88" exhaust valves. (whatever size exhaust valve flows better on that head)

ezstriper 02-16-2009 05:18 PM

For that power level don't need the bigger rods, forged crank or 4 bolt mains.....

drpete3 02-16-2009 07:05 PM

thanks My builder already has a forged crank and mine is cracked. we are using a 2 bolt main and not a big deal going to the bigger rods


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