403 build - Advice and Opinions
403 build - Advice and Opinions Hey everyone. I recently picked up an LQ4 that I plan to rebuild and put in the bird and would like some opinions/advice on what I have planned for it. I am hoping to make 500rwhp N/A and it will be mostly a road warrior that will be driven often. I wouldn't really say it's a daily driver as I'm in a situation where I only go into the office on a daily basis 4 months out of the year and the rest is 1-2 days a week. But it will be my primary vehicle other than terrible weather days.
I had planned to have a cleanup hone to 4.005 and make a 403 but the general consensus it to just go straight for the 4.030 and a 408 so that's what I'm going to do. Here is my current planned parts list for the build. All opinions and advice is welcome. Thanks!
TSP forged 4" crank
TSP 6.125 H-beam rods with ARP 2000 bolts
Mahle -4cc Flat Top Pistons
King main & rod bearings
Have the rotating assembly balanced
TFS LS2 GenX 220cc As Cast with PM guides and milled for 3/8 pushrods and maybe LS3 turned down valves
247/254 .624/.595 112+4
*BTR SLR lifters
ARP Main studs
ARP head bolts
ARP cam bolts
Melling 10296 pump
LS2 timing set
FAST LSXR 92 intake
NW 92 TB
FTP 104mm Lid
FAST 36LB injectors
04+ LS6 valley cover
Racetronix pump with body ground kit
If I can fit it in, a Mad Man manual steering rack
*Powerbond 25% UD pulley
* Items I already have are starred
I had planned to have a cleanup hone to 4.005 and make a 403 but the general consensus it to just go straight for the 4.030 and a 408 so that's what I'm going to do. Here is my current planned parts list for the build. All opinions and advice is welcome. Thanks!
TSP forged 4" crank
TSP 6.125 H-beam rods with ARP 2000 bolts
Mahle -4cc Flat Top Pistons
King main & rod bearings
Have the rotating assembly balanced
TFS LS2 GenX 220cc As Cast with PM guides and milled for 3/8 pushrods and maybe LS3 turned down valves
247/254 .624/.595 112+4
*BTR SLR lifters
ARP Main studs
ARP head bolts
ARP cam bolts
Melling 10296 pump
LS2 timing set
FAST LSXR 92 intake
NW 92 TB
FTP 104mm Lid
FAST 36LB injectors
04+ LS6 valley cover
Racetronix pump with body ground kit
If I can fit it in, a Mad Man manual steering rack
*Powerbond 25% UD pulley
* Items I already have are starred
Last edited by Decadence75; Jun 21, 2014 at 01:04 AM.
Its something along those lines, I wish I had the link but I found it pretty easy in Google
Last edited by DREAMZ28; Apr 12, 2014 at 01:50 AM.
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Would mid 12s be too much compression for running on 93? Do you think there would be any valve shrouding issues using the large bore version of the head on a 4.005 cylinder?
What is the valve size between the two? But I'm pretty sure it shouldn't be a problem as that bore can take up to a 2.165 valve and I don't think the as cast heads are nearly as big, probably a 2.055 or 2.08 which is plenty safe for that bore.
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Verdad Gallardo Yes unless you're running a huge cam that will bleed off the compression a good amount.
What is the valve size between the two? But I'm pretty sure it shouldn't be a problem as that bore can take up to a 2.165 valve and I don't think the as cast heads are nearly as big, probably a 2.055 or 2.08 which is plenty safe for that bore.
What is the valve size between the two? But I'm pretty sure it shouldn't be a problem as that bore can take up to a 2.165 valve and I don't think the as cast heads are nearly as big, probably a 2.055 or 2.08 which is plenty safe for that bore.
Thanks for the info!
Here you go. Get a set of these heads and follow the recipe the guy with the 402ci engine did to get 602 rwhp with a 23X/24X cam and a fast 102 manifold.
http://www.yellowbullet.com/forum/sh...d.php?t=786466
http://www.yellowbullet.com/forum/sh...d.php?t=786466
Here you go. Get a set of these heads and follow the recipe the guy with the 402ci engine did to get 602 rwhp with a 23X/24X cam and a fast 102 manifold.
http://www.yellowbullet.com/forum/sh...d.php?t=786466
http://www.yellowbullet.com/forum/sh...d.php?t=786466
Use a 4.030 bore. Use mahle power pak pistons and rings. Never look back. We can get you everything you need from the tsp heads to custom cam to complete rotating assembly for a package deal price.
Let us know!
Let us know!
It will be a while before I'll be able to make the order, just in the planning stages right now but I will definitely keep you guys in mind!
Sounds good. I updated the proposed list in the first post if you want to check it out and make any suggestions.