LS7 or 427 questions - thinking really hard on this

Reply Subscribe

Thread Tools

Search this Thread

Mar 28, 2007 | 11:57 AM

98-LS1

Thread Starter

TECH Enthusiast

iTrader: (4)

Joined: Aug 2005

Posts: 739

Likes: 0

From: Knoxville, TN - Cedar Bluff

LS7 or 427 questions - thinking really hard on this

I've been reading on here trying to pick out a great combo for my Z-28, I've thought about forced induction, nitrous, cubes, etc... After looking at prices I've considered the 427 route, not only for awesome N/A power and torque but for the cool factor, " Yeah I've got a 427! " I've been looking at some of the sponsors custom built motors, shortblocks, but I had a few questions that I hope some of you can answer. With a bore as big as a 427 has, how would the LS2 aftermarket heads do such as the AFR's? Would a LS6 intake be too small to make good N/A horsepower? Also, will all of my accessories and computer work on a 427 shortblock with the LS7 top end, meaning the heads and intake? And finally, I'm sure bigger fuel injectors would be necessary but will the stock Throttle Body be too small to handle the flow a 427 needs? If so which kind of TB would ya'll recommend? Thanks, I'm sure I'll have more questions later on but I wanted to make sure I buy the right parts and know for a fact there will be no fitment issues with this motor. Thanks again,

Mike

Mar 30, 2007 | 12:52 AM

LTBear70

Teching In

iTrader: (1)

Joined: Jun 2005

Posts: 9

Likes: 0

From: Northern Illinois

No help here, just more of the same questions. I am also building a NA 427.
What do you guys think about heads? 225 AFR w/ Fast 90, LS7 w/ matching intake, L92/L76, or Stage 3 LS6 by one of the tuners, MTI, LPE, Cartek, Patriot, etc? I have HD radiator, LT headers.

Mar 31, 2007 | 07:42 AM

Max@Cartek

Banned

Joined: Feb 2002

Posts: 301

Likes: 0

From: NJ

After market heads are a good start, but they need some work too to get them where they need to be. As far as intakes, the FAST 90 is the way to go for the big cube motors. That would mean going with the larger TB as well.

Shoot me a PM or email me at Max@Cartek.net if you have any other questions.

Max
Cartek Racing
908.317.4496

Mar 31, 2007 | 10:55 AM

VortechC5

TECH Enthusiast

iTrader: (6)

Joined: Jan 2003

Posts: 665

Likes: 0

From: Black Forest, CO

That's why I spent the extra coin to do a 427 over a 416. Plus my wife told me that I'd be silly not to get the larger engine!

Quote:

Originally Posted by 98-LS1

I've considered the 427 route, not only for awesome N/A power and torque but for the cool factor, " Yeah I've got a 427! "

Mar 31, 2007 | 11:31 AM

Wyckedcamaro

Banned

iTrader: (2)

Joined: Oct 2003

Posts: 1,016

Likes: 0

From: New York

Quote:

Originally Posted by VortechC5

That's why I spent the extra coin to do a 427 over a 416. Plus my wife told me that I'd be silly not to get the larger engine!

wish my wife was like that.

I had to hit her in the head with a hammer to even be able to SPEAK to her about an upgrade on the motor.

Your wife have a sister she could hook me up with?

Mar 31, 2007 | 11:58 AM

SLED28

FormerVendor

iTrader: (7)

Joined: Jan 2002

Posts: 1,940

Likes: 0

From: Toronto, Canada

98-LS1, I would just go with a LS2 427 short with either a LS7 topend or a AFR/TF/ETP 225 head or larger. Should be between 540-570rwhp

Mar 31, 2007 | 01:39 PM

71CamaroLS1

Launching!

Joined: Dec 2003

Posts: 251

Likes: 2

From: Portland OR

The LS7 top end is clearly the option of choice on big cube motors like this if you can swing the coin - nobody's cathedral port heads can quite match the flow numbers through the range that the LS7 has. The mid lift flow numbers rival those of top-flight NASCAR heads.

And it's backed up by the real world results - LG motorsports has built a number of LS7 'vettes in the 620 rwhp range with mildly reworked LS7 heads.