Big Bore Heads

Reply Subscribe

Thread Tools

Search this Thread

Jun 29, 2006 | 08:23 AM

Taphee6

Thread Starter

TECH Apprentice

iTrader: (2)

Joined: Apr 2004

Posts: 323

Likes: 0

From: Cary Il

Big Bore Heads

Does the LQ9 heads have the best potential on a big bore motor (4.060 Bore). I am looking to keep my compression at 11.5:1 or 12:1. I know these would have to be milled a lot. The best I can do on valve size with a -2cc piston I believe is 2.055.

I got my *** spanked by a Power Adder Cobra. Didn't mind all that much at the tome cuz she was HOTTTTT but now its bugging the hell out of me....I am getting 440 RWHP today on half *** heads.

Thanks in advance

Jun 29, 2006 | 12:23 PM

DONAIMIAN

TECH Senior Member

iTrader: (18)

Joined: Jun 2002

Posts: 10,036

Likes: 0

From: NW Houston, TX

are these heads for a new motor that your getting built, or a motor thats already in the car. If you already have the motor in the car tell us a little more about it, and tell us more about the heads thats on the car right now.

Jun 29, 2006 | 12:57 PM

Taphee6

Thread Starter

TECH Apprentice

iTrader: (2)

Joined: Apr 2004

Posts: 323

Likes: 0

From: Cary Il

???

Here are the specs Dynoed 440 RWHP and 410 RWTQ

Iron block CI 396
-4.060 Bore
-Diamond Pistons -2cc
-Stock crank-ground down
-Carrilo Rods
Cam
-Luniati 236/236 595/595 112

Current Heads
-Ported stock
-202/157 valves
-Flow at 7.0 was 286/216

Rockers are Comp Pro Mag 1.75
Lifters -Comp R
Intake LS6
Headers Mac Mids

Please let me know if I missed anything. Thanks again

Jun 29, 2006 | 01:28 PM

kumar75150

TECH Fanatic

Joined: Mar 2003

Posts: 1,112

Likes: 0

From: Dallas

u are leaving hp in many spots

better header
better heads
bigger cam
fast 90/90

Jun 29, 2006 | 01:57 PM

Taphee6

Thread Starter

TECH Apprentice

iTrader: (2)

Joined: Apr 2004

Posts: 323

Likes: 0

From: Cary Il

I know

You are right,

When I built the motor the 90/90 was not out yet. Heads, Long tubes will be on the way soon. I want to get the heads first and then get the cam and intake to match. That is why I am asking about the LQ9's .

Any advise is welcome
Thanks

Jun 29, 2006 | 02:37 PM

kumar75150

TECH Fanatic

Joined: Mar 2003

Posts: 1,112

Likes: 0

From: Dallas

right now your best bet would probably be going with AFR 225s or ETPs

Good ported LQ9 or LS6 heads will probably cost you just as much.

Jun 29, 2006 | 03:28 PM

corvettetimmy

On The Tree

Joined: Apr 2005

Posts: 104

Likes: 0

Get a set of the patriot stage 3 heads.
best bang for the buck. I made 492rwhp with stage 2 heads on a stock bottom end 6.0 with a cam in the high 230 duration and fast 90
same cam, intake and patriot heads made 535rwhp in another customers car with a 408. best part is they are only $1295 for a pair ready to go

Trending Topics

4L80e loosing line pressure

35

997
Never knew about this Trans Am before

9

286
Oil Bypass Barbell

8

129
406 Hydraulic to Solid Roller cam results

12

372
LT1 camero. Fastest stock NA pony car ever?

1.1k

30.8k

Jun 30, 2006 | 06:16 PM

Haans249

TECH Addict

iTrader: (24)

Joined: May 2005

Posts: 2,045

Likes: 4

From: Fort Worth, TX

I'm with corvette on this, if you're budget restricted, go for the patriot stage 3's, You also need to kill the cam, you need something with more int/exh split, maybe 4-6 degrees, and more lift for sure. Get the FAST 90, or a ported one from Tony Mamo, and you'll be set.
Also, you get the cam to match you're overall setup, and right now, the FAST 90 is about the only feasible option for an intake and good cost. The better your intake/head combo flows, the less duration you'll need, keep that in mind.

Best Regards,
Adrian