396 Cam Choice, Please Help

Reply Subscribe

Thread Tools

Search this Thread

Jan 29, 2007 | 04:34 PM

billc5

Thread Starter

On The Tree

iTrader: (1)

Joined: Oct 2003

Posts: 148

Likes: 0

From: Toronto

396 Cam Choice, Please Help

Which one of these would be most suitable

I would like this engine to have near stock idle 600 rpm

Street manors are the goal.

C5

396ci LS6 stock heads

A4, 2400 stall converter, 273 rear end, Mag 112 Blower,

4.125 stroke

6.125 rods

3.905 bore

10.5:1 CR

Headers and 3in center section.

Hi Flow Cats are installed.

These are in stock which is also important.

212/218 - .558/.563 w 1.7 rocker - 115 LSA - ComCam 424

224/230 - .581/.588 w 1.7 rocker - 114 LSA - CompCam 444

207/220 571/.578 w 1.7 rocker 118.5 CL - GT2-3

or

204/218 .555/.551 w 1.7 rocker 117.5 CL Keep the LS6 cam and save $400.

Jan 29, 2007 | 06:12 PM

JPH

TECH Junkie

iTrader: (2)

Joined: Jan 2006

Posts: 3,776

Likes: 0

From: Fort Wayne, IN

Quote:

Originally Posted by billc5

gt2-3 if i had to pick.

Jan 29, 2007 | 06:22 PM

Beast96Z

TECH Veteran

iTrader: (21)

Joined: Apr 2003

Posts: 4,049

Likes: 3

From: Shreveport, LA

I'd go with the 224/230, but the driveability won't be "like stock". You'll know there is a cam in it. Second choice would be the GT2-3.

Jan 30, 2007 | 10:48 AM

billc5

Thread Starter

On The Tree

iTrader: (1)

Joined: Oct 2003

Posts: 148

Likes: 0

From: Toronto

well then GT2-3 is the cam I will go with, I dont want to have any idle issues and the lower the idle the better for the A4

Jan 30, 2007 | 11:18 AM

LS1Formulation

12 Second Club

iTrader: (14)

Joined: Apr 2006

Posts: 3,929

Likes: 1,160

From: Grand Rapids, Michigan

All of those cams are too small for a 396 cube engine. You need something like a 226/230 with XE-R lobes on a 115 LSA. Widening your LSA is what will give you stock like idle characteristics. You have to feed 50 more cubic inches than stock, so even though the cam has added duration, it's not going to idle or behave like it would in a stock 346 cube engine.

Jan 30, 2007 | 09:55 PM

Beast96Z

TECH Veteran

iTrader: (21)

Joined: Apr 2003

Posts: 4,049

Likes: 3

From: Shreveport, LA

Quote:

Originally Posted by LS1Formulation

Widening your LSA is what will give you stock like idle characteristics.

Actually decreasing valve overlap is what controls idle charecteristics, but widening LSA is a way to acieve that. Lowering duration is another way. The GT2-3 cam has -23.5* of overlap at .050" wearas the cam you listed has -2* at .050". There will be a pretty big diffrence in idle charecteristics between the 2. Everything about his combo screams low to midrange power, so the cam in question should do a good job with the blower. While he could make more power with a bigger cam, I don't think he is worried about "all out" performance.

Jan 31, 2007 | 03:06 PM

Steel Chicken

TECH Enthusiast

iTrader: (3)

Joined: Aug 2005

Posts: 597

Likes: 0

From: Castle Rock, CO

Quote:

Originally Posted by Beast96Z

I'd go with the 224/230, but the driveability won't be "like stock". You'll know there is a cam in it. Second choice would be the GT2-3.

im running a 224/236/116 in mine, and with tuning it has very stock drivability.
And thats on a stock 346. 396 will be even more mild. the gt2-3 is stock without tuning.