Jason 98 TA

iTrader: (4)

Well I finally got around to posting some quick pics of the latest version of our dart port we've been working on. The dart head seems to be a pretty nice setup once they get a little attention to detail The current version of the Precision Race Components port flows like this:

.300 204
.400 254
.500 292
.600 315
.650 319

The cool thing is these heads are setup for 3.905 bore!! Here's a few teaser pics for you guys to checkout!! I'll try to post flow info on the exhaust port in the next few days.

The head should setup with plenty of p/v for even the largest of camshafts & will feature a pretty small chamber also Feel free to ask any questions you may have!!

Brandon Boomhauer

iTrader: (10)

exhaust #s?

and as cast i/e #s?

LSUxBlake

iTrader: (3)

Wow. They look great. Keep us updated if you decide to dyno test them, and do you have any prices??

Steve Burger

iTrader: (33)

Are these the 225 or 205 version and what valve size?

Phil99vette

iTrader: (11)

99blancoSS

iTrader: (115)

what he said, wow those look sweet

Jason 98 TA

iTrader: (4)

They started life as a 225 Dart casting.
Off The Shelf ready to install Flow Info:

.300 196
.400 239
.500 276
.600 296

The port we are on right now is 229cc runner I haven't seen the 205 version of the head yet so I have no idea what they flow.

xfactor_pitbulls

iTrader: (16)

Not very impressive for an aftermarket casting. Pretty typical numbers for an LS1 head. For the price, I dont see why someone wouldnt just get a GM casting from you.

Brandon

davered00ss

iTrader: (4)

What is the price on the Dart heads?

Phil99vette

iTrader: (11)

15 degree - thick deck and factory valve angle
Dart Average flow: 277cfm

11 degree - and we all know 11 degree flows more by design
ET Heads average flow: 293 CFM

IMO that is pretty good for any casting. Why don't you guys start looking at the average data instead of the peak, peaks don't mean ****. Its the average cfm that matters. You would buy these heads over the LS1/6 because of the deck thickness. On the cars that are making serious this is a key design in keeping the heads down. I'm only running a 346 with a 150 shot and have signs of lifting the heads.
Phil

xfactor_pitbulls

iTrader: (16)

Actually Phil, I have average flow at 266 cfm from .200-.600, thats the number that matters. To be brutally honest, there are no numbers anywhere in the lift range that are beyond a good stage 2 LS1 head. If you want to try and build a case for the thicker deck and/or better PTVC, then go ahead. I dont see it though, if I was building a high dollar engine and was worried about deck integrity, I would probably get the higher flowing head for alittle more $, that also has a thicker deck. BTW I started preaching average cfm numbers long before your post, so you arent telling me anything new. But as I am sure you are aware, it all depends on your lobe profile. Your time spent at .400-.650 would be greatly increased on a super agressive lobe, as opposed to a more friendly lobe like the XE.

Brandon

INVISIBLEZ

iTrader: (45)

Brandon, these are just the first sets that're being played with. I have to say that I'd much rather these heads over any ported stockers, for anyone who's spraying a large shot you want the thicker deck height. Give it time, you'll see some impressive gains, but the real test will be on the track, and rollers.....

davered00ss

iTrader: (4)

I'll take one for the team and let them use my car as a test.

xfactor_pitbulls

iTrader: (16)

Yeah Mike, I dont doubt that one bit. Just stating that the dart casting isnt all that impressive. That was evident from Brian Tooley's post regarding the Trick flow heads versus AFR and Dart. Said dart wasnt even on the board. I would be more curious to see what the guys at PRC could do with a trick flow casting.

Brandon

BTW Mike, I got the LS1 castings popping 300 at .600 and 208 at .300
Valve job R&D is where its at.

INVISIBLEZ

iTrader: (45)

That's cool, glad you're doing good. I think alot of head porters with their outrageous prices will down the darts because of the pricing. I've always seen very good results from Dart heads. Oh and I'm not putting you in the above catagory, because god knows you barely charge above food stamps!!!!! Take care.

Mike

P.S. Remember we had this discussion about my GMPP LS6 heads, look @ what they did, it's not all in the lift #'s.

Jason 98 TA

iTrader: (4)

We've been working on them a little bit more today Here's where they're at

.300 206
.400 259
.500 294
.600 320
.650 325

SStrokerAce

iTrader: (2)

Brandon,

Flow numbers win races right?

Problem is most LS castings go turbulent, i'd rather have better flow than more flow. From what I have seen of the Dart castings they don't have any turbulence in them.

You guys can look at average numbers or look at the port where it flows most of it's volume, in that reguard the numbers TSP post look good to me. Hell compare them to a LS6 head and these things are light years ahead of them.

Bret

INVISIBLEZ

iTrader: (45)

Jason, what are a set of these going to run finished, as you alls set will be??

xfactor_pitbulls

iTrader: (16)

Nope and dont claim that they do. But if you wanna measure the value of some shops work by flow numbers only, then its a crap shoot. As of now all we really get are flow numbers on these newer castings. You talk about turbulence..........someone once told me that a head should never stall, at every lift point it should raise flow, if only 1 cfm. That shows you are not getting fragmented or turbulent flow. No doubt there are more variables than straight flow numbers, it is sure a good indicator of what the head is capable. When have you ever seen someone post the pressure referenced value for true or turbulent flow? I sure havent. Its the internet Bret, what else do we have? Flow bench queens, dyno queens, and drag queens.

Brandon

Jason99T/A

iTrader: (21)

Jason, those #s look great!

I couldn't be happier with my PRC 5.3l 2.5s. BTW, headers go on this week.

Jason