i have 454s bored .030 over j/e forged pistons 9.5:1 compression,four bolt main,eagle forged rods and stock forged crank.the heads are the 990 castings which are open chamber rectangular port. they have been bowl ported with a little work done to the exhaust side and only gasket matched on the intake side.engine builder said that since i was only running 5200-5500 rpm i wouldnt see much difference on the intake side. i am also running crower roller roskers 1.7 ratio. my motor builder gets all of his cams custom ground from some place in louisiana. he called them today to see what they recomended.he gave them the flow #s from the heads told him that it was in a boat the approx. weight,rpm etc. they told him to run performer rpm intakes and these cams 224 dur. int. 230 dur. exh. 557 lift int. 575 exh. on a 114 lobe sep. does that sound right to you guys for the cam and intakes? by the way i forgot to mention that the heads have 2.30 intake valves and 1.88 exh. they will also be roller cams.sorry for the long post wanted to give as much info as possible. thanks for any help.

Sounds pretty good to me! Should make 375 to 400 HP and have a nice idle with good power from 2000 to 5200 RPM.

excaliber,

I agree with Vette, the Edlebrock Performer RPM dual-plane aluminum hi-rise intakes will work well---especially with the BIG heads you're running with---you'll need all the torque you can get. The cams duration sounds like it's RIGHT ON only they might work a little better if you had them ground maybe on 112* lobe seps or even a 110* vs a 114*. It won't be as torquey with a 114*, a 112* lobes will be better and a 110* lobe seps would be the torquiest, but 114* lobes will work.

Can you tell us what kind of exhaust system you're running with?

So far you're on the right track!

Mark/KAAMA

excaliber, if your engines are all apart, you might also consider doing a "bore notch" job on the cylinder bores. This may only take about 2 hours and dyno tests have shown about 25-30hp and torque increase---well worth the little time to do this and a cheap way to pick up addtional power, but it MUST BE DONE CORRECTLY and by someone WHO BELIEVES IN BORE NOTCHING. If the person who's building the engines doesn't believe in bore notching or know the benefits of it then he probably doesn't know how to do it correctly either. Tinkerboater knows how to do this and so does JimV for his customers. It only costs about $80 or so to do this modification---and that's CHEAP horsepower!

Mark/KAAMA

thanks for the replys. kaama i am running gill 4" exhaust and risers.i have talked to my engine builder about bore notching and he agrees with you,unfortunately once i read your other post about it i already had the short blocks togeher.do you think i would be better off with the crane 731 every one has good things to say about it on the board.

the 990 heads show max flow around .550"

the 731 cam will get keep you at .550 a lot longer than the cam you list so I would expect a bit more punch from it.

You gotta make sure you use the right springs with the 731 or you'll go into coilbind.

excaliber,

With those GILS you'll have a pretty decent combination. Are these 224*/230* duration cams hydraulic rollers? I know the Crane 731 is, but I can't remember the specs. I didn't realize you were using hydraulic rollers---rather I thought you were using the hyd. flat tappet. Anyway, I know they're more expensive, but you're going to like that hyd. roller cam much better if you use them...so is your engine. And if it's not too late try to have those cams ground on 110* lobes or at least 112*. With your combination it sounds like your engines will actually make something more like 480+hp. But you want to try and make them some TORQUEY 480+hp engines! Torque is what gets the mass moving not horsepower. You're going to have a lot of fun because you're on the right track.

Mark/KAAMA

YEP THE 731 IS A PROVEN ,PART AND WOULD MAKE MORE POWER
THAN THE ONE YOU SPEC'ED . ALSO GO WITH WHAT KAMMA SAID THE 112 OR 110 WOULD BE BETTER ON EITHER CAM ,THE INTAKES ARE GREAT ,YOU'LL HAVE A NICE ENGINE WHEN FINISHED