Thread: which head??

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I am planning for a 8:1 compression 350 with a 72cc head with nice wild cam fully built rockers etc.. and twin turbos...

do u guys think I shoudl use the dart aluminum heads or the dart cast iron heads... I dont want the crazy high priced 1200.00 heads.. so either the aluminum head or the cast iron "platinum" series

which do u guy think

I was thinking cast iron due to the fact that the manifod will be VERY hot due to the turbos and I dont want to have a problem with warping in the head surface


Dave

You want to run twin turbo's but you are worried about a $1,200 set of heads.I don't get it.

yeah I dont feel I NEED the 1200.00 set of heads first off plus those heads only come in 68cc and I need 72cc so in that respect I need to get wither the aluminum ones or the cast iron platinum ones..

besides IME aluminum is NOT what u want when running turbos due to the EXTREME heat.. thats myw orry I would think cast would be the way to go

Dave

Why turbos?? Just punch it out to a 383 stroker with afr heads and you can make an easy 450 hp and have it be reliable and smokin fast.

nope... I want turbos

Dave

If you want Dart heads, call their tech line and get some advice. Keep in mind that horsepower primarily resides in the heads because flow is everything. IMO, you ware making a mistake trying to skimp on heads. You should be running the best flowing heads you can find for this engine if you want it to perform effectively. Building a great engine means choosing a combination of parts that work together as a unit. The most common mistakes novice builders make are choosing cams that are too big, carbs that are too big, and heads that don't flow enough air or heads that flow too much air. Then they wonder why their new engine runs like a dog. Just make sure you do your home work and make a lot of calls to get the opinions of experts. You are pouring a lot of money into this engine so you don't want to screw up. Just my two cents worth . . .

so yoru telling me that the cnc ported aluminum head at 64cc will flow better then the cast head at 72cc??

I planned to work the heads and port etc.. however I need the 72cc heads for the lower compression.. so my choice on that in dart is either the aluminum 72cc platinum series head or the cast head at 72cc

the 64cc/68cc (which ever it be) I cant use that will make my compression to high.. I cant match the pistons good enought o make the compression low enough with that head

Dave

[QUOTE]Originally posted by SpooledupRacing
[B]so yoru telling me that the cnc ported aluminum head at 64cc will flow better then the cast head at 72cc??

I planned to work the heads and port etc.. however I need the 72cc heads for the lower compression.. so my choice on that in dart is either the aluminum 72cc platinum series head or the cast head at 72cc

the 64cc/68cc (which ever it be) I cant use that will make my compression to high.. I cant match the pistons good enought o make the compression low enough with that head The size of the combustion chamber has nothing to do with flow rates in the intake or exhaust ports.

What I was trying to say is the size of the cumbustion chamber has nothing to do with flow through the intake or exhaust port.

ah o... well I called Dart and the supplier I am buying the heads from.. I plan to use the Pro 1 Aluminum Dart heads.. they are

200cc intake ports
72cc chamber
2.02/1.60 int/exh valves

thats the stock info on the heads...

here is th ekey.. I am running twin turbos but they will be small turbos and this car is not being built for serious racing just look, sound and run nice and get the AWW factor.. I would be happy with a 12 sec pass or so

it is soemthing for me and my wife to do together and something I have always wanted to do.. just for fun and thats it..


Dave

You'll always want more than one opinion, even if they are experts. Now, call Brodix and see what they recommend. Compare the two and go with what you think works best for your application and your wallet.

One trick I have learned over the years is to have the smallest port voulme with the highest flow numbers.

well here is what there website says abotu dart heads

200cc intake port
72cc Chamber volume
2.02/1.60" intake/exhaust valves

Street performance, exellent replacement for stock heads, 6000 rpm, 327/383 ci

OR

180cc intake port
72cc chamber volume
2.02/1.60" intake/exhaust valves

Excellent street or marine upgrade, maximum torque & throttle response through low/midrange 305/383 ci



in reading those what do u guys think???

Dave

If it were me, I'd go 200cc because you are going to be forcing a lot of air through them. You might give up a little torque at lower rpm's but you will see a lot more power at mid and upper rpm ranges. With the power you are going to be generating, you are not going to be hurting for torque when you drive at low rpm's. What does Dart say? Do you have access to flow numbers for comparison purposes? AFR 195 heads work great on 350's and 383's so I don't think 5cc's will make that much difference.

or there is

215cc intake port
72cc Chamber volume
2.05/1.60" intake/exhaust valves

Serious street perfornmance, Bracket Racing, restricted Oval Track 7000 rpm, 350/400 ci