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peanut heads

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    Cole SS cole ss's Avatar
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    Default peanut heads

    Does anyone know the combustion chamber cc on peanut port heads. My heads are #360. I was wondering if switching to 049 heads would make any difference in compression ratio? Up or down. I was wanting to make a head change to large oval port with bigger valves. My motor is 1990 454 hardin. Has anyone made this swap with good results? Thanks
    Last edited by cole ss; 09-23-2010 at 10:15 AM.

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    Quote Originally Posted by cole ss View Post
    Does anyone know the combustion chamber cc on peanut port heads. My heads are #360. I was wondering if switching to 049 heads would make any difference in compression ratio? Up or down. I was wanying to make a head change to large oval port with bigger valves. My motor is 1990 454 hardin. Has anyone made this swap with good results? Thanks
    IMHO, a switch to 049 or 781 would be a great upgrade ...a switch to 990's would be even better (oval vs rect)...all of them work very well ...whatever you decide, just, get rid of the peanut heads...you will be way ahead of the game! ...just my .02 cents

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    Quote Originally Posted by cole ss View Post
    Does anyone know the combustion chamber cc on peanut port heads. My heads are #360. I was wondering if switching to 049 heads would make any difference in compression ratio? Up or down. I was wanting to make a head change to large oval port with bigger valves. My motor is 1990 454 hardin. Has anyone made this swap with good results? Thanks
    Dont' worry about compression loss. I've ran 990's on 8:1 motors and had great results. The hp gain switching to the 049 will far offset any compression loss. Do you already have some 049's or are you still in the market. There are way better heads than the outdated tech of the 049.
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    Cole SS cole ss's Avatar
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    I have the heads apart and being checked at shop. I thought about 990, but I am only doing a mild build. I just want to get away from the restrictions of the peanut port. I want to use my stock short block which is in great shape. Keep my stock logs. Rectangular ports would problably be over kill. I am worried about to low of compression and what would be a good cam. I am looking for over 425 hp. I love my boat, but with hauling more teenage kids I want a little more power. Thanks
    Last edited by cole ss; 09-24-2010 at 06:25 PM.

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    Quote Originally Posted by cole ss View Post
    I have the heads apart and being checked at shop. I thought about 990, but I am only doing a mild build. I just want to get away from the restrictions of the peanut port. I want to use my stock short block which is in great shape. Keep my stock logs. Rectangular ports would problably be over kill. I am worried about to low of compression and would be a good cam. I am looking for over 425 hp. I love my boat, but with hauling more teenage kids I want a little more power. Thanks
    Lower compression could be a great deal, dump a grand and put a b/m blower on it !
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    from the info i have looked at the peanut head would be 118 cc chamber
    and the 049 show up at 119 cc
    but you can put some $$ into putting larger valves and port work into making these heads flow well so get some firm quotes.

    rec port heads would be a lazy at your cubes/compression/rpm range if you are dollars ahead look into hyd roller cam setup.

    Best of luck.

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    gn7
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    We settled this on another thread. 8 to 1 BBC IN A JET need 360 heads and a Dart T ram with 2 1050s and a 290 @ .050, .800 lifter solid roller. Others wise your just leaving power on the table.



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    Quote Originally Posted by gn7 View Post
    We settled this on another thread. 8 to 1 BBC IN A JET need 360 heads and a Dart T ram with 2 1050s and a 290 @ .050, .800 lifter solid roller. Others wise your just leaving power on the table.
    Can you still use the long slot stamped steel rockers on that

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    Yes, but it is very close, and you have to convert to 3/8 studs



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    Cole SS cole ss's Avatar
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    Really just looking for someone who has tried this before, and to what result. Would like to use larger cam. Mild by your standards.

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    gn7
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    There should be no appreciable compression loss going to the 049. You can buy soem after market heads that will help boost your compression a little. But the chamber size on your peanut heads is probably just as big, if not bigger, than the 049s



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    What is your RPM range? 049s will have a bigger chamber than the 360s.

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    Cole SS cole ss's Avatar
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    I am looking to be in the 5,000 range more or less. I would like to keep my stock bottom end. My boat runs 57 @ 4,450. It weighs about 2500lb. I just want a little more get up and go. Love to get to about 65mph. Miss having a nice sounding cam.

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    I dont know on a boat because of the exhaust problems, but a 5000 RPM engine with a nicely worked set of peanuts are the way to go, I get 560 HP @ 5600 RPM 580 TQ with a 9.6 comp 467 with a [email protected] flattappet hyd cam, and it makes power right off idle, and remember that could be 580 HP on Reher Morrisons dyno. If your set on the bigger ports a 781 has a smaller chamber than a 049, 820s or 148s would also work well, but not as good as a killer set of peanuts. One also has to keep in mind porting production heads on a boat is probably not a great idea.
    Last edited by Vortecpro; 09-23-2010 at 07:27 PM.

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