help with 402 build

Reply Subscribe

Thread Tools

Search this Thread

Feb 7, 2012 | 04:45 PM

ls1foxcoupe

Thread Starter

Staging Lane

iTrader: (9)

Joined: Jul 2008

Posts: 93

Likes: 0

From: Dunn,NC

help with 402 build

I am going to build a lq9 block 402.

I have a set of 5.3 cnc'd heads that flow 317 @.600
they have 2.02 1.60 valves.

Will they make 600hp or do I need to go to the LS3 heads?

What size cam do I need?

Feb 7, 2012 | 04:48 PM

raulz28

Teching In

Joined: Aug 2010

Posts: 11

Likes: 0

From: Eagle Pass

Are you talking 600bhp or 600rwhp BIG difference?

Feb 7, 2012 | 04:55 PM

raymond mckinney

10 Second Club

iTrader: (4)

Joined: Mar 2005

Posts: 1,288

Likes: 86

From: Tampa, FL

What intake? How much compression? Lots to factor in.

Feb 7, 2012 | 05:03 PM

ls1foxcoupe

Thread Starter

Staging Lane

iTrader: (9)

Joined: Jul 2008

Posts: 93

Likes: 0

From: Dunn,NC

flywheel hp
I have a victor jr. and a 4150 throttle body.
pump gas 11.5 to 1

Feb 7, 2012 | 08:47 PM

raymond mckinney

10 Second Club

iTrader: (4)

Joined: Mar 2005

Posts: 1,288

Likes: 86

From: Tampa, FL

2000cfm TB? Solid roller or hyd roller? 1 7/8 headers? Depending on the Cam you could see 600 flywheel hp.

Feb 8, 2012 | 07:58 PM

ls1foxcoupe

Thread Starter

Staging Lane

iTrader: (9)

Joined: Jul 2008

Posts: 93

Likes: 0

From: Dunn,NC

1000cfm throttle body. Hydraulic roller with short travel lifters and yes 1 7/8 headers

Need a cam?

Feb 15, 2012 | 10:02 AM

Patrick G

LS1 Tech Administrator

iTrader: (14)

Joined: Nov 2001

Posts: 8,246

Likes: 34

From: Victoria, TX

600hp is like 520-530rwhp. That's going to be pretty tough with small heads and intake manifold with small runners. You could get pretty close, but you'd have to run a HUGE cam. Something like the upper 240s on intake and low 250s on exhaust with an LSA around 110-111. You could hit the power much easier with some Trick Flow 235 heads and a smaller cam. LS3 heads would do it too, but you would need to change intake manifolds to one with rectangular ports.

__________________

2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.