Alright you guys, I need to be choosing my heads, as i know the AFR 190's I have now won't be too helpful trying to make 950 hp.
I have basically decided that I want 23 degree heads, to keep things as simple as possible.

I am destroking my 420 to a 406 and adding two turbos that will make 16 psi. I wont rev this engine above 6500rpms, and it will have a full roller valvetrain, and a solid roller cam. Specs will be tailored to cylinder heads.

Basically I will need a port larger than 220cc's. A bunch of you have been helping me out, and suggested some great heads. Thanks for doing so. Now I need to settle for one.

I like AFR's 227, Brodix's WP -10 SP X, and All Pro's AP220S & SP heads. I havent seen flow charts for All Pro's heads but I know the Brodix's flow more than the AFR's, but they also cost 4 grand. Does anyone know the price for All Pro's heads and the flow numbers?

My goal is 950 hp, any help is accepted. Thanks guys.

Hunter

 

what kind of intake do you plan to use? This will dicate your head choice since certain intakes wont go to a 1206 gasket which is what you are describing you want to use

 

my bad....

I will be using a custom sheetmetal intake, either from Hogan's or a local guy. Gasket choice will depend on heads, as I will be getting the intake made after i choose heads.

Hunter

 

What's your budget?

 

ditto...

 

Im gonna let myself spend 3000 on heads. This including porting, valves(titanium), the heads themselves, bronze guides, and spring seats.

I can fudge a little and skip the titanium valves for now if need be.

For 2 grand the AFR 227's seem pretty good....but tell me what you guys think.

Hunter

 

DUDE check out pro action heads. www.procylinderheads.com... go through www.dynoflo.com and they can get you some awesome deals on those heads and other hardware. i PROMISE you, you will not be dissapointed. Also, on the note of porting, you might want to do a little home porting on the exhuast side, and its not that hard at all. just an idea, but definetly check out the pro action heads and CALL dyno flo to get the best deals. I'm also doing a twin turbo 388 stroker which i plan on porting some heads for.

 

Ya they got some good heads, I had their vortech replacments on my old 350, I loved them.

Their E/I ratio is kinda lacking, which is why the AFR's and Brodix heads are calling to me. But nothing some exhuast porting cant help. Ya and I plan on porting myself, but paying for flow bench time.

I think I will plan on the AFR 227's for now. They have great flow, good e/i ratio, and for 2 grand, I can use that money to port them some more and get the titanium intake valves I want. Nothing but Inconel for the exhuast.

How much boost are you planning on using and what turbos? I hope all goes well with your project.


Hunter

 

Do you have some flow #’s for your AFR 190’s?

You might want to do some math... I’m not sure where exactly you came up with the 950hp or 16psi numbers, but assuming that you choose your compressors well (and are at over 70% adiabatic efficiency at your HP peak), use a decent intercooler (again, I assumed that a decent intercooler would be about 70% efficient or better), and also assuming that the rest of your combination (especially the cam) strikes a good balance between the rpm you have to turn that the flow dynamics imposed by the turbos you should be able to make your power peak at about 7Krpm with about 260cfm flow on the intake ports… all of which really should be achievable with mildly worked 190’s. Personally, I’m a firm believer many builders that end up making their number end up going overboard with the port sizes on the heads they choose just to be safe at the expense of midrange, difficulty tuning…

For that matter, since you already have the 190’s I don’t really see the harm of putting it together and if you just can’t do it upgrading later…

 

I agree with Mark. You probably don't need heads that exotic to make 950hp in a forced induction application. Also, why "950hp"? Seems like a pretty arbitrary number.

Rich Krause

 

well, rember, the better you flow, the less boost you have to run and the less heat and risk of detonation, AND.... you can use pump gas without problems. Our goal is about 315/240 @ .6 and 750 hp @ 6-7 psi.

 

www.weldtech.com

get the CNC ported track 1 heads...head flow isn't everything

 

I would be extremely surprised to see an AFR 190 pull to 7k on a 4.125 bore small block with a blower. You'll be running out of port by 6500, probably sooner considering the extra mass your pushing through the port.

Ok, your choices seem fine. The AFR 227 is a good head as are the others. Another choice you might want to look at is the Dart Pro 1 227 (full CNC). It's numbers are stronger than the full comp. port AFR. Dart builds a good head... just wish they still made their raised port 23* heads.
I'd classify the heads in this way.... The Dart 227 CNC, AFR 227 (full comp. port by AFR) and the WT Track 1 recommended above. They're all on the same playing field, but my choice would be the Dart first.... it's about $500 less than the Weld Tech T-1. It'll get the job done no problemo. Just basing this on what I've seen from guys I race with.
The -10x is on another playing field, especially when you start talking about Weld Tech's HVH 10-x.... that head romps all of these throughout the lift curve but it's more money. Just over 3k.

So, I'd go with the Dart 227 Pro 1 CNC. You can buy a smaller port and work it to the size you need (CFM means nothing next to proper port shape and csa) or you can buy the head you need and go. My .02.

-Mindgame

 

I check the Dart heads, and they seem like an excellent choice. Do you know who sells them? I checked all over and couldn't find anyone who carried the 227 CNC's.

Hunter

 

Friend of mine got his from Herbert Performance:
http://www.herbertperformance.com/

Their website is down but you can get a catalog/information at that link.

-Mindgame