LS2 402 buildup in stages? AFR or SDPC Help!
Originally Posted by Steve Burger
Well I am trying to figure out how to do this in steps. I can't do this in one big bang. So I want to:
A - Get the AFR 225 heads and fast 90/90 for the 346 and then use them on the 402 latter.
OR
B - Get the 402 with a better cam and use the AS 5.3 heads and LS6 intake. Upgrading the heads and intake latter.
I am just trying to get a sense of what is the best route.
A - Get the AFR 225 heads and fast 90/90 for the 346 and then use them on the 402 latter.
OR
B - Get the 402 with a better cam and use the AS 5.3 heads and LS6 intake. Upgrading the heads and intake latter.
I am just trying to get a sense of what is the best route.
im also going to hopefully start my ls2 buildup and my goal is the 402...but one question i can never get answered is on texas speed the rotating assemblies refer to ls1/ls6 not ls2..will those assemblies fit my block?..and also to get to 402 what machine work has to be done..im doing mine like steve is..in steps..i too havent picked 6 yet..im going diffrent route by jsut collecting all necessary parts then put it together..
Originally Posted by 1970judge
im also going to hopefully start my ls2 buildup and my goal is the 402...but one question i can never get answered is on texas speed the rotating assemblies refer to ls1/ls6 not ls2..will those assemblies fit my block?..and also to get to 402 what machine work has to be done..im doing mine like steve is..in steps..i too havent picked 6 yet..im going diffrent route by jsut collecting all necessary parts then put it together..
Steve,
The only problem for me is buying a second set of heads. I have talked to a few experienced people who told me that as long as the heads I have flow 305+, we shouldn't have any problem with 500rwhp or damn close anyway. My only concern is that my heads were set up for a much smaller cam than will be used in the 402, so they peaked a little lower in the lift. I hope they don't fall off too much around.600 or so.
If you won't have to wait to long to afford new heads, I would leave them set up for an ls1 so you could defer your cost on the new set by selling them later. chris
The only problem for me is buying a second set of heads. I have talked to a few experienced people who told me that as long as the heads I have flow 305+, we shouldn't have any problem with 500rwhp or damn close anyway. My only concern is that my heads were set up for a much smaller cam than will be used in the 402, so they peaked a little lower in the lift. I hope they don't fall off too much around.600 or so.
If you won't have to wait to long to afford new heads, I would leave them set up for an ls1 so you could defer your cost on the new set by selling them later. chris
Originally Posted by Steve Burger
Well I am trying to figure out how to do this in steps. I can't do this in one big bang. So I want to:
A - Get the AFR 225 heads and fast 90/90 for the 346 and then use them on the 402 latter. With this route, will the AFR heads work well on a 346? Will the valves clear the cam? I understand that the AFR heads are best on a 4.00" bore. Will that cause problems? The fast 90/90 will work but be better suited to a larger cube engine. That's not an issue as they will be on one latter anyway.
OR
B - Get the 402 with a better cam and use the AS 5.3 heads and LS6 intake. Upgrading the heads and intake latter. I know I can get the pistons set up for whatever I want. I know I can spend the $$ toget the 5.3 heads opened up for the 4.00" bore. Is reworking the heads a waste as they will be replaced? Is selecting pistons for the 5.3 heads knowing that I will upgrade going to be an issue? Can the 5.3 heads and the LS6 intake support 500+ RWHP in this configuration?
Either method has a set of compromises. I am trying to figure out what has the least negative impact long term.
I am just trying to get a sense of what is the best route. I hope this clears up my question.
A - Get the AFR 225 heads and fast 90/90 for the 346 and then use them on the 402 latter. With this route, will the AFR heads work well on a 346? Will the valves clear the cam? I understand that the AFR heads are best on a 4.00" bore. Will that cause problems? The fast 90/90 will work but be better suited to a larger cube engine. That's not an issue as they will be on one latter anyway.
OR
B - Get the 402 with a better cam and use the AS 5.3 heads and LS6 intake. Upgrading the heads and intake latter. I know I can get the pistons set up for whatever I want. I know I can spend the $$ toget the 5.3 heads opened up for the 4.00" bore. Is reworking the heads a waste as they will be replaced? Is selecting pistons for the 5.3 heads knowing that I will upgrade going to be an issue? Can the 5.3 heads and the LS6 intake support 500+ RWHP in this configuration?
Either method has a set of compromises. I am trying to figure out what has the least negative impact long term.
I am just trying to get a sense of what is the best route. I hope this clears up my question.
Here is what I would do.Save the $$ until you have enough for all of it at once.This way you won't be switching parts/losing $$ when it comes time to build the motor.More than likely prices will come down more in the future too.Also on your list should be a good set of headers to support the 402 like Kooks stepped or so.
The 225's will not fit a 346 with notching.
I am building up an ls2 403 for my z06. Am using mahle pistons from texas speed. They are really nice and a great price. Crank and rods are Eagle. Heads are 2.08 pp because AFR does not have the small chamber 225s available. The pp are have the good springs included so the price is right although if I pay myself for the cleanup porting I could have paid for the AFRs. I was going to do a solid but decided to stay with hydraulic for now. Will be using the pp rocker arms also...cause of the eventual solid. Cam will be comp 250/260, .640 lift and 110 lsa. I want to bleed of some compression at lower speeds to help with detonation. Intake will be fast 90 with 1 7/8 kooks and dual 3 in exhaust. Just toggle off the knock sensors. I am hoping for 550 rwhp also.
