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Could anyone tell me if 290cc Intake Ports ,110cc Combustion Chambers would respond well in a jet boat 454?
 

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yes it will do just fine.

the 290cc is gonna limit how much power you are gonna put out,but on the flip side,imo unless you have a big inch mill then you will be just fine.


there are plenty of guys i know making decent power with the 781or049 cast heads.and they have i think 250s on the intake runner.


the 110cc chamber is good for a small dome piston to make some decent compression.anyway hope this helps,travis:)hand
 

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Sit N' Spin
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You can do 600 hp 496 motors with pocket ported factory ovalports. More with the darts. TIMINATOR
 

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I have a set of Edlebrock heads with 290cc intake runners on my 454 it made 600hp with a flat tappet cam & 10-1 CR .
 

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E-7 Sheepdog (ret)
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Yes Nordic, those should do just fine on a 454. 781/049's do well, very well with a bit of porting, on what are nominally 255cc ports.
 
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