Stealthy Silverado...requesting comments
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
Stealthy Silverado...requesting comments Fellow LS1 Tech experts,
I'm replacing my 2000 Silverado's 5.3L with the following 402ci set-up :
6.0L iron block (LQ4), 4.000 in bore
4.00in stroke Eagle forged crank
6.125in Eagle H beam rods
LS6 (243) Heads (64cc)
LS6 intake
LS6 2002 Camshaft (204/218 @ .0500 lift, 117.5 LSA)
Pistons....????
...here's where I need some consultation....Do I get -12cc dish forged pistons and go for a 400hp+ NA street machine?.....or do some sort of serious monkeywrenching to get the compression down to an acceptable/workable FI application? My goal is to get to 500Hp and take the next Dodge SRT10 that lines up next to me.....
Looking for some advice on what to do here.....any comments?
I'm replacing my 2000 Silverado's 5.3L with the following 402ci set-up :
6.0L iron block (LQ4), 4.000 in bore
4.00in stroke Eagle forged crank
6.125in Eagle H beam rods
LS6 (243) Heads (64cc)
LS6 intake
LS6 2002 Camshaft (204/218 @ .0500 lift, 117.5 LSA)
Pistons....????
...here's where I need some consultation....Do I get -12cc dish forged pistons and go for a 400hp+ NA street machine?.....or do some sort of serious monkeywrenching to get the compression down to an acceptable/workable FI application? My goal is to get to 500Hp and take the next Dodge SRT10 that lines up next to me.....
Looking for some advice on what to do here.....any comments?
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
Likes: 0
From: Nebraska
99SilveradoSS,
I took your advice on a bigger cam and got the Torquer v2 from TSP. Now I just need to decide on the pistons (low or high compression )...before I take everything into the Machine shop.
*Also undecided on whether to go with a 402 or 408 ....should probably just bore it .030 over while everything is there....
Thanks.
I took your advice on a bigger cam and got the Torquer v2 from TSP. Now I just need to decide on the pistons (low or high compression )...before I take everything into the Machine shop.
*Also undecided on whether to go with a 402 or 408 ....should probably just bore it .030 over while everything is there....
Thanks.
You need to be carefull if going with a high copression motor. Small cam with wide lobe separation can lead to detonation especially in a heavy truck. What happens is you can't bleed off the compression down low. Double check the DCR to sure its not too high. Always ran as much compression as you can safely get away with. Its free horsepower. Personally I would run a lot bigger cam.
If it was mine I would leave the small bore to give the room to bore if you were o hurt a cly. The power difference between 402 and 408 will be very little.
Good luck with the project.
If it was mine I would leave the small bore to give the room to bore if you were o hurt a cly. The power difference between 402 and 408 will be very little.
Good luck with the project.
what are you calling "high" compression? if it were me for a truck that sees daily driving i would do like 10.5-11.2ish:1 and i would have gone with a different cam also. what kind of tranny/converter setup you have behind this? what rear and gear? i would do a flat top piston with valve reliefs and the above mentioned comression ratio range and then spray it to wax those gay SRT10s
Originally Posted by Stroker2112
99SilveradoSS,
I took your advice on a bigger cam and got the Torquer v2 from TSP. Now I just need to decide on the pistons (low or high compression )...before I take everything into the Machine shop.
*Also undecided on whether to go with a 402 or 408 ....should probably just bore it .030 over while everything is there....
Thanks.
I took your advice on a bigger cam and got the Torquer v2 from TSP. Now I just need to decide on the pistons (low or high compression )...before I take everything into the Machine shop.
*Also undecided on whether to go with a 402 or 408 ....should probably just bore it .030 over while everything is there....
Thanks.
