so im building a 383 from ground up (being my first motor build im a little nevous) but anway im aiming for 450 brake horsepower i started with an eagle rotating assembly its a cast steel crank and i beam rods ARP cap screws all around and 10.7:1 aluminum pistons for reliabilty and pump gas friendly. I've got that in but now am trying to figure out what to do for the top end??? i was thinking dart aluminum PRO 1 CNC
-64cc combust
-227cc intake
-but online it only gives option for 2.08/1.60 valves is that too big??
and I havnt a clue on how to choose cam

I NEED SOME SOLID ADVICE
ps i will get some pics up

 

 

I would keep the intake runner closer to 200 rather than the biggest ones you can get. Its not a all out race motor. Next I would call Comp. Cams on their 800 number or go on line and fill out the information and they will suggest the cam that is right for your combination.

 

I agree. You'll regret going that large on the runner size. The valve size isn't a problem, as most performance heads use anything from 2.02"-2.08" intake valves. Your static compression ratio is pushing the limits for pump gas. Aluminum heads will certainly help make it work, but I'd feel more comfortable down closer to 10:1, than the 10.7:1 you've planned. Today's premium gas is just too wimpy for that high a CR.

 

im least worried about the gas the chevron 94oct here is good 0%ethonal (and its too late anyway their already in). thats good to know about the valve size though, might I ask why keep go to 200cc intake runner though, all i know about motors is move as much air as possible but like I said its my first motor.
as far as cam goes I did some reasearch and i gotta find my tranny ratios and my final ratio's then i'll call witch ever cam maker i end up deciding to use (opentoideas)
oh ya i cant figure out how to post pics???

 

Spend a couple extra dollars and get the AFR 195's. No need for the Copetition port job just the standard Eliminator 195. They are the best head out there to many.

 

Make a few calls or inquires to some of the head manufactures and see what cc runner heads they would suggest you go with.

 

94 octane is good, and the ethanol doesn't hurt the octane or cause pinging. It might even help deter some pinging with it in there. You might end up wanting to go a little larger combustion chamber, but I'd run that past an engine builder, or whoever you're talking to about the heads.
Running too large on the ports will create issues with scavenging too much air for the engine's ability to flow fuel. That will really hurt the bottom end HP if you don't match everything up. An engine isn't just bolting parts together; it's about matching everything together, and then putting the right drivetrain with it to maximize what you built. I doubt you'll find anyone reccommending anything over 200cc flow for an engine that sees even half it's time on the street. Those big flow heads are a race only application, where you are operating at high rpm's all the time, and need max flow constantly. They could care less about anything under 5,000 rpm's.

 

thanks ill definatly look into those AFR heads, and make a some calls i got time as i just finished 7 weeks of school and funds are a little low at the moment.
that is good to know though 1971BB427 I am hopeing for a light to light monster.

 

I have only read what AFR has on thier sight and already they seem to be far above and beyond what dart is doing.