Pro Stock John

iTrader: (34)

What kind of results are folks getting with the above listed heads on stock bore LS6 engines? I'd be happy with a 25rwhp gain with a stock 02 Z06 cam, and of course 30rwhp would be sharp. This would be for my 02 Z06.

ADMIN

SPANKY LS1

iTrader: (24)

I would try one of the recent "budget" ported LS6 heads that are now available. IIRC PRC (TSP) and Livernois both have ported LS6 heads (243s) for less than $1000 complete. 30rwhp could be realistic, I would think.

Obviously, AFRs, Trick Flows, or Darts would probably do better, but they are more than double the cost.

thechef

iTrader: (13)

John id consider Edelbrocks in that list

Gearhead1

If I'm not mistaken, the Darts are still under $1300 at Summit Racing.

davered00ss

iTrader: (4)

$1,280 @ summit. But are they any good?

SSDude

I started a thread similar to this a few months ago out of curiosity but was not able to get an answer. I wish that some sponsors would do a comparison of both dyno results and track times. So which sponsor is going to step up to the plate?

vettenuts

iTrader: (4)

I got 24 HP out of my Dart 205's, and that was with a decrease if valve lift at the same time. Compression is also higher from the 62 cc chamber. High quality valve train parts as well, and very lightweight.

PREDATOR-Z

There was one tread when AFR just came out, head only swap for 22rwhp gain (out of box) on a C5 M6 IIRC.
Just mill + thin gasket those for a nice 8.5>8.7 DCR and you'll have more than what you bargained for.

JZ'sTA

iTrader: (23)

I think all of the above will work well.
The ETP would be a choice as well, but personially I would do the darts for the cost reason.
Just get them down to about 59cc's and have some fun.

ChucksZ06

iTrader: (9)

I would clean up the ports on your stock heads put in some thinner head gaskets and save a lot of money...you will be within 10 hp or less and have one or two thousand dollars to spend on cleaning up the intake and exhaust sytems.

ArcticZ28

iTrader: (14)

I vote for sending your stock heads out to someone to get ported. It should definitely be under $1k for what you're looking for. If you don't want to keep your heads, I vote Dart for the price and bump in compression with the 62cc chamber. If you still want more compression, do like Predator said and use a thinner gasket.

Pro Stock John

iTrader: (34)

I'd probably stay away from 59cc stuff in case I wanted to do a cam with some lift.

Chicago Crew UnderBoss

iTrader: (1)

I agree, and that is why I just ordered my 225cc DART HEADS for my new forged 347 LME motor being built as we speak, and these heads are suppossed to be excellent with a thicker deck also perfect for F/I.

I know a couple of guys running the DARTS and one is a mechanic and he is VERY IMPRESSED with these heads. Also, don't forget that KP running a procharged D1SC blower on his f-body into the mid 9s at over 140 mph is also running these times with the DART 225 heads (so they is some real life proof out there) that these are excellent heads (ESPECIALLY FULLY ASSEMBLED from SUMMIT for $1,289.00 for the pair)!!

1QuickT-A

iTrader: (12)

I think you could get 25rwhp or damn close to it with any of the heads you listed..

PREDATOR-Z

John,
Why do heads and keep stock SCR? As a Z06 you're allready at 10.5:1.
Every point in SCR is worth ~4% power.

And no need for 59 cc, Just calculate DCR and use the thin gasket to take off as much as possible, the rest you mill.

Also, you could put a .650 lift on 59 cc as long as the DUR, VEs are correct, it will fit. Look at the latest XFI/LSK lobe trend.

Abdullah

iTrader: (2)

hand ported bare 205 AFR's by a good porter like race-prep.

PREDATOR-Z

I do not agree, for big cams, maybe, for Z06 cam the smaller high velocity runners are the ticket.

Abdullah

iTrader: (2)

my 205 AFR heads are bare and hand ported by race-prep to 209.5 cc intake runners so they are still small and they are flowing very well.

PREDATOR-Z

That is mild hand porting. Do you have flow numbers? Just to compare to advertised stock ones.
BTW, I met some very competitive guys from Kuwait at the drags in UAE last year. Perhaps you can come too one day?

Abdullah

iTrader: (2)

Intake runner CC's = 209.5

Exhaust runner CC's = 85.5

Intake flow figures: Ehaust flow figures:
.050--36.3 -23.8
.100--77.8 -51.4
.150--115.4 -85.3
.200--138.5 -115.0
.250--171.2 -146.0
.300--202.9 -186.8
.350--230.9 -211.3
.400--255.3 -228.8
.450--270.5 -243.9
.500--288.0 -252.3
.550--302.0 -259.5
.600--314.0 -263.2
.650--321.1 -267.7
.700--327.6 -271.9

bare 205 AFR heads hand ported by race-prep. i will try to come to UAE if i get a chance insha Allah.