Trying to decide which heads to buy for my 383...Keep in mind this is a street car on pump gas with around 10.8:1 compression....

I've got one friend telling me to find a set that flow in the 350 range.

I've got another guy telling me my low end will suffer with that much head and that the Dart 227cc CNC would be perfect for what I'm trying to accomplish....

I talked to yet another guy who runs 5.80s in the 1/8 in a late model mustang with an all motor 382 IIRC with a set of heads that flow in the 330 range....This same guy dropped a few degrees of his cam and went .2s faster in the 1/8...

SO, that being said I think some people get caught up in numbers too much....

Please advise.

 

Also, this being a street car should I even spend the extra cash to go with an 18 or 15 degree setup?? Wouldn't this be a big headache in the long run? I mean, 650 fwhp can be achieved with a conventional 23 degree setup, right?

 

How about haveing a pro design the engine for you and give you a quote for building it. It's the COMBINATION of things in the engine and whole vehicle that work together to get the results.

Yeah, don't get lost in the numbers.



IMO, Mustang guys sometimes don't tell the truth about what they are running.

 

Well, why don't we just shut down this discussion forum then? I mean, if we all need to go to the pros and have them design/build our engines then what are we doing here?

I simply asked if a conventional 23 degree setup is capable of producing 650 fwhp. Do you have anything to add to this topic??

 

I've got a 385 with P/P Stock Lt1 heads with 2.02/1.6 valves and on 5lbs boost am at about 615 fwhp, So yes it can be done. In defense of OldSStroker I had my shortblock and heads done by a pro and if you want to get to 650 NA that wouldn't be cheap.

 

383cid (do you already have the parts?)
~10.8:1 compression (why so low?)
320-350cfm (at what lift and pressure?) 2 valve 23* heads (I'm assuming raised runners?)
naturally aspirated
with a goal of 650hp?

what kind of fuel?

 

.

Pump gas... I don't think anything over 11:1 is safe on 93 octane do you?

I'm looking hard at the Dart 227cc CNC heads... I plan to run a pretty large cam in the neighborhood of .680 lift, solid roller....

I don't plan to mail order parts and put it together in my own garage...and hope it makes power. I know some very knowledgeable engine builders and with their help I will achieve my goal....

I just thought I'd get a few opinions here. Is that a sin?

 

650 might be a little bit out of reach then

 

Okay, so what do I need? More cubic inches?

I saw an article in Super Chevy IIRC about a 472 ci small block with 10:1 making ~675....

 

Whew! I must have touched a tender spot. Offense accepted.

Do I think a non-professional is going to get 650 fwhp from a pump gas SBC for street car with a "conventional 23 degree setup" ?

Probably not, at least NA.

A while ago your goal was 550-600 hp.

http://web.camaross.com/forums/showt...5&pagenumber=1

There was some pretty good advice given you in that thread. You even believed my screw thread numbers.

And yet more...

http://web.camaross.com/forums/showt...5&pagenumber=1

FWIW, What I'm doing here is commenting on things my experience applies to. You appear to want confirmation of your ideas of what it takes. Sorry, Fickle, not from me.

Don't listen to me...free advice is worth what you paid for it. However, you might listen to the other guys who posted.

I now understand your screen name.

 

Fickle: part of the reason it's hard to answer your question is that we have no way of knowing what a "street" car is according to your definition. But the answer to your question is "yes". It is possible to make 650hp with a 23 degree head. It will be a high rpm motor with a big cam and big heads and consequently not one I'd find very pleasant on the street. The streetability would be enhanced in a very light car running a lot of gear. Would you like the result? I don't know.

In any case, this would not be a bolt together and go project. It's an exotic project. Since you've never built anything like this before, some thing is going to be wrong when you first bolt it together. You may end up needing to change cams, valve springs, intake, or the heads, etc. to get it to work. And it will a lot of time to dial it in on a dyno. I don't think that anyone who knows how to do this will give your their detailed fromula for free. It's how they make their living. But the "Engine Masters" writeups are a good place to start.

I'd approach it stepwise. Start with a good shortblock, moderate heads and cam, and see how you like it. Then go on from there if needed.

Rich Krause

 

Thanks for your response Rich.

I do NOT plan to build this on my own after buying parts off ebay... I will have a professional help me pick the components and build it for me. My goal may be set a little too high, but without goals what are we here for? If I only get 580-600hp, I'll still be ecstatic!

My idea of a street car is working headlight, tail lights, wipers, etc. That's it. I want a FAST car that I can put pump gas in. I don't care how radical it is.... I have the money to make it go fast.

As far as the car, I plan to put it in a 1st gen Camaro. With a tubular K and some other weight reduction I hope to get the car in the low 3k range. I am thinking about a glide or maybe a TH350...I haven't made up my mind on that one yet.... cause I'm Fickle right SS?

 

Ah, yes...

"Indecision, the key to flexibility."--Anon.

 

If this thread is not producing the results you seem to feel you are entitled to, I'll be glad to shut it down - that would be the thread, not the forum.

Fred

 

I would not want to run a 'glide on any car that sees the street. To make one work right in a combo like yours, you would need a converter that stalls at 5,000+rpm. No matter how much you are willing to put up with something "radical" I think a shorter first gear with a tighter converter would be a lot more pleasant.

Rich Krause