Nimitz87

iTrader: (17)

I have bone stock out of the box dart pro 1 heads on the car and ALOT of people have told me they respond really welll to porting. they are the 205cc heads.

I thought porting them bigger was a no no on a non FI car as far as velocity goes...what about milling them? running a smaller gasket? Or can I do a mild port/polish?...

mods in sig, if the heads come off a bigger cam will go in...something either from Vengeance racing or PatrickG....plan on a 100 shot soon as well. pump gas.

Would I run into PTV issues w/ the smaller head gaskets and milled heads?...

240/244 .608/.596 112+4.

VRX6 238/240 .605/.609 112/113/114 LSA

VRX7 244/248 .612/.596 112/113/114 LSA

Chad

vettenuts

iTrader: (4)

Bret Bauer loves these heads and ports them frequently. You could contact him and get his opinion since he uses the Darts more than anyone else I have seen. Bob at the old Precision Porting uses them a lot also.

Sigforty

I have had the 205s since dart came out with them. on a 346 they work great. mine are milled 30 thou and ran fine on my ls6 with the gm mls gasket and a f14 cam from futral.

Nimitz87

iTrader: (17)

info on bret bauer and where to contact him?




thats what I planed. you have the .040 gaskets? F14 is pretty similar to the torquer isn't it? what did you put down just curious?.

Chad

vettenuts

iTrader: (4)

bret@bauer-racing.com

Sigforty

the gm mls gaskets are around .054 I think. the best thing about them is the price. I paid 35 dollars for the set with my club discount at a chevy parts counter. the car put down 452 rwhp / 423 rwtq. the cam is similar in advertised duration, but the ramp rates and other stuff is different.

Nimitz87

iTrader: (17)

full list of mods please? fast 90/90?

its hard to believe im down THAT much w/ just having the out of box darts...

Chad

vettenuts

iTrader: (4)

Harland sharp rockers, PP valve springs and that cam. Why did you pull the Dart provided PSI beehive springs, they are super springs that will rev extremely high.

Nimitz87

iTrader: (17)

I didn't the heads were bought bare...don't ask I didnt know **** and got screwed on the hole head install by a shop

when i say all mods, I mean what exhaust, intake, LT's etc....your making 42rwhp/23rwtq over me...

whats your SCR/DCR? I'm at 10.5/7.9

would it be better to run a thinner head gasket to boost SCR/DCR or mill the heads and run stock thickness?

edit: saw mods in sig...thats it? holy crap im leaving a TON on the table...looks like I'll be pulling the heads and leaving the tq2 in there...

Chad

Hugger

iTrader: (21)

I run a set of Dart 225's unported, but milled .020". I ran it with a Comp 228/228 XE lobe cam without issues. Now I run a 220/224 cam with a proprietary lobe from the sponsor I bought the cam used from. Lift on the new cam is just a shade under .600 lift. I also run the cheap fel-pro gaskets.

On a side note... Does anyone have any before and after gains on out of the box darts vs. a set of ported ones? If mine ever come off I have considered porting them. Are most guys CNC porting or doing it by hand?

Nimitz87

iTrader: (17)

I'll let you know. when the combo changes it'll be a ported stock TB, and ported/milled. 205's smaller head gaskets but the big difference will be thru a moser 9". should happen in a month or two.

Chad

vettenuts

iTrader: (4)

You are making more than I am, although not a ton more. Do you have a dyno curve, I am wondering if there is an issue with the setup that may not be the fault of the heads themselves. Any dips or other issues that would indicate valve train instabilities?

PS: I am making 393 (before FAST) with the VHP_056 cam (216/224 0.551/0.551 114.5 LSA) and the other parts in my signature.

Sigforty

My setup with the 346 was as follows:

Dart 205's milled 0.030
GM MLS head gaskets with a 0.054 crushed thickness.
Futral F14 cam on a 112 LSA
Ported stock TB
stock ls6 intake
LG headers
underdrive pulley
Halltech CAI

Nimitz87

iTrader: (17)

only big difference is the ported TB, and headers. besides the milled heads.

you just had the heads milled, not ported/polished at all?

Chad

Nimitz87

iTrader: (17)

I'll try and figure out how to post it up from winPEP.

Chad

Nimitz87

iTrader: (17)

here it is, this is one of the earlier runs before fine tuning...I can't find the 410/390 one.



Chad

Sigforty

That is all I had done was the milling. I think most of the performance lies in the cam. Futral has some great grinds, and the F14 with more compression worked out great. The car even went up in mpg as well. I was getting 32 mpg cruising at 70-75 on interstate.

Here was my original post although the graph is not up anymore.
https://ls1tech.com/forums/showthrea...light=Dart+205

And this was my current setup the day I picked it up. Once I broke it in the car went back to put down 487 rwhp and 475 rwtq.
https://ls1tech.com/forums/showthrea...light=Dart+205

I am currently awaiting a bigger set of heads to properly feed the stroker and when they come in I will have some new numbers.

Nimitz87

iTrader: (17)

sigforty thanks for that awesome thread on the darts...

you really think the F14 is making that big of a difference over the torquer 2?...

how close are you w/ PTV clearance? is that why your running stock thickness head gaskets?

Chad

Sigforty

Yep the F14 will make that much of a difference. The ramp rates and a few other things in the cam profile are way different the the T2. While the advertised numbers are the same there is more than that in the cam profile.

There was no issue with the PTC that I know of. In talking with Allan I probably could have even used the Cometic gaskets if wanted, but the GM MLS are cheap so that is why they are being used. I can pay 80+ a gasket for cometics or 17 a gasket for GM MLS. When you have to buy two that is like 35 dollars to 160.

vettenuts

iTrader: (4)

Looks to me like a valve train issue at 6,400 RPM. When does that cam run out of steam?