Looking for 400hp on 383's
#1
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Looking for 400hp on 383's
Hi everyone, my engine builder is almost done with the 383's and I am wondering how many hp/torque should I expect from them, this is the set up :
Eagle rotating assembly
Steel crankshaft
Performer cylinder heads 70 cc
Hyperteuntic dome pistons
9:1 cr
PRW alum rockers 1.5 ratio
Performer air gap intake
Edelbrock 1410 750 cmf carb
Comp cam 12-318-4
222/226 at .50 lift
.464/.464 valve lift
110 LSA
Stainless marine "hi torque" exhaust w custom risers
Hopefully this is enough info for the estimate
I would like to get only constructive criticism pls , thanks
Eagle rotating assembly
Steel crankshaft
Performer cylinder heads 70 cc
Hyperteuntic dome pistons
9:1 cr
PRW alum rockers 1.5 ratio
Performer air gap intake
Edelbrock 1410 750 cmf carb
Comp cam 12-318-4
222/226 at .50 lift
.464/.464 valve lift
110 LSA
Stainless marine "hi torque" exhaust w custom risers
Hopefully this is enough info for the estimate
I would like to get only constructive criticism pls , thanks
Last edited by Diego9040; 07-19-2012 at 01:23 AM. Reason: Adding stuff
#2
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I couldnt give you a number but to me with 383's, your cam specs look tame. I bought the engines for my boat and had my guy go through them. He said we were leaving HP on the table with the cams that were in them but they would make good torque. In the end we left them in there. They're 355s and make over 400lbs T. With the twins the boat has all kinds of balls down low but wont rev past 5000. In retrospect I wish I had sacrificed some bottom end and let them rev and make some HP. Although it planes like a ski boat for all the work involved the boat isnt all that much faster top end then it was with the stock 270hp 350 mags.
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I couldnt give you a number but to me with 383's, your cam specs look tame. I bought the engines for my boat and had my guy go through them. He said we were leaving HP on the table with the cams that were in them but they would make good torque. In the end we left them in there. They're 355s and make over 400lbs T. With the twins the boat has all kinds of balls down low but wont rev past 5000. In retrospect I wish I had sacrificed some bottom end and let them rev and make some HP. Although it planes like a ski boat for all the work involved the boat isnt all that much faster top end then it was with the stock 270hp 350 mags.
Thanks for your comments.
Ps: will be running mirages 25p
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Anybody else? Where are the experts?
I know it is just a couple of sbc's but I really want to know your sincere opinion.
Thank you all in advance
I know it is just a couple of sbc's but I really want to know your sincere opinion.
Thank you all in advance
#5
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I'd say about 360-385 at the crank - on a dry dyno through headers and no accessories. (or more appropriately the dynos accessories)
300 or so to the props with all accessories turning and with that exhaust.
Should idle well and last a long time. Id say you left about 40 HP on the table with your choice of sticks.
Uncle Dave
300 or so to the props with all accessories turning and with that exhaust.
Should idle well and last a long time. Id say you left about 40 HP on the table with your choice of sticks.
Uncle Dave
#6
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Hi everyone, my engine builder is almost done with the 383's and I am wondering how many hp/torque should I expect from them, this is the set up :
Eagle rotating assembly
Steel crankshaft
Performer cylinder heads 70 cc
Hyperteuntic dome pistons
9:1 cr
PRW alum rockers 1.5 ratio
Performer air gap intake
Edelbrock 1410 750 cmf carb
Comp cam 12-318-4
222/226 at .50 lift
.464/.464 valve lift
110 LSA
Stainless marine "hi torque" exhaust w custom risers
Hopefully this is enough info for the estimate
I would like to get only constructive criticism pls , thanks
Eagle rotating assembly
Steel crankshaft
Performer cylinder heads 70 cc
Hyperteuntic dome pistons
9:1 cr
PRW alum rockers 1.5 ratio
Performer air gap intake
Edelbrock 1410 750 cmf carb
Comp cam 12-318-4
222/226 at .50 lift
.464/.464 valve lift
110 LSA
Stainless marine "hi torque" exhaust w custom risers
Hopefully this is enough info for the estimate
I would like to get only constructive criticism pls , thanks
#7
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A cam change is in the works for me but it wont be this year.
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I agree with this 100%, I think you'll be disappointed with that cam selection with the rest of the components you've assembled.
Do it now, or regret it later.
As for your question, the expert is right here. He can get you what you are looking out without making many sacrifices.
http://www.marinekineticsonline.com/
Last edited by BBCLiberator; 07-19-2012 at 09:27 PM.
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fixx
Hi everyone, my engine builder is almost done with the 383's and I am wondering how many hp/torque should I expect from them, this is the set up :
Eagle rotating assembly
Steel crankshaft
Performer cylinder heads 70 cc
Hyperteuntic dome pistons
9:1 cr
PRW alum rockers 1.5 ratio
Performer air gap intake
Edelbrock 1410 750 cmf carb
Comp cam 12-318-4
222/226 at .50 lift
.464/.464 valve lift
110 LSA
Stainless marine "hi torque" exhaust w custom risers
Hopefully this is enough info for the estimate
I would like to get only constructive criticism pls , thanks
Eagle rotating assembly
Steel crankshaft
Performer cylinder heads 70 cc
Hyperteuntic dome pistons
9:1 cr
PRW alum rockers 1.5 ratio
Performer air gap intake
Edelbrock 1410 750 cmf carb
Comp cam 12-318-4
222/226 at .50 lift
.464/.464 valve lift
110 LSA
Stainless marine "hi torque" exhaust w custom risers
Hopefully this is enough info for the estimate
I would like to get only constructive criticism pls , thanks
you will probably see 400 ponys and it will be all over with @ around 4500 rpm..i would go witrh the zz4 cam..
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ummm,,your going to have allot more compression then you think! im using a .046 gasket,zero deck,,same heads as your usnig but a 355 and im at 10.2 to 1 with srp flat top pistons..thank god your using alunimum heads,shave 1 point their..
you will probably see 400 ponys and it will be all over with @ around 4500 rpm..i would go witrh the zz4 cam..
you will probably see 400 ponys and it will be all over with @ around 4500 rpm..i would go witrh the zz4 cam..
My biggest concern if I went bigger with cam is reversion. I'm forced to run silent choice with short risers. I know cubic inches will mellow a cam but how far can it be stretched only adding 33 CID?
Last edited by 87MagnumII; 07-19-2012 at 11:03 PM.