LS4 Front-Drives 2005-2009 - valvetrain upgrades.

im looking to upgrade my valvetrain but dont know to much about all that.can someone point me in the right direction as far as a package goes. i was looking at this but not sure if itl work.what you guys think.il have some help to install all this.and just dont wanna mess anything up.

http://www.summitracing.com/parts/PAR-8401/

or

http://www.summitracing.com/parts/NAL-12499224/
http://www.summitracing.com/parts/TFS-21407400/
http://intense-racing.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=IR&Product_Code=LSX-COMP-623-16&Category_Code=LSx_Valvetrainhttp://intense-racing.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=IR&Product_Code=LSX-MAN-VR16x&Category_Code=LSx_Valvetrain
http://www.summitracing.com/parts/CSP-SLS18/

sorry for all the links but just wanna make sure itll work.and im ordering the right parts.also if theres anythin im missing please let me know.thank u

Most people are just doing roller rockers with a little more lift. Our heads flow really well, the restriction is in the intake/exhaust manifolds.

Roller Rockers for sure, springs would be good too. Do a search lots of discussion.

Pac 1218 springs with new seats, seals, retainers, locks, chromoly pushrods, 1.8 rockers.

is there a certain size for the chromoly pushrods? i wanna go with the ls6 springs are the PAC 1218 springs better than the ls6 springs? iv looked around but dont exactly understand the sizes..and dont wanna mess with the DOD and mess something up.

is there a certain size for the chromoly pushrods? i wanna go with the ls6 springs are the PAC 1218 springs better than the ls6 springs? iv looked around but dont exactly understand the sizes..and dont wanna mess with the DOD and mess something up.

LS4s use the standard pushrods for LS engines - 7.400 inch length, 5/16 inch diameter.

:cheers:

thanks for the info tiredGXP.

Pac 1218s will go up to .600 lift, same as comp 918s. Yellow springs go up to .550 if I remember right.

OOOo ok cool.thanks neilownz.
what would you guess recommend?
i dont exactly know to much about all this .and with the DOD got me a little worried ,dont exactly know what to replace.although a few people told me just to get some rockers.i would like to replace everything as a system..u guys kinda understand me?lol i dont think i understand myself lol

ninja edit.
think i got it decided..let me know what you guys think.
*Chromemoly PR's
*Patriot Performance LS Valve Spring Kit .650" Lift http://www.haddadmotorsports.com/catalog/patriot-performance-valve-spring-lift-p-92.html)
*Yella Terra Ultralight Bolt on Shaft Rockershttp://www.haddadmotorsports.com/catalog/yella-terra-ultralight-bolton-shaft-rockers-p-88.html

SOoo what do you guys think?

-for starters, you only need springs and rockers. I would go with 1.8. GET ALL THIS STUFF NEW.
-for the pushrods, they are all pretty similer so you wont see any advantage to getting new ones unless the ones in your car are banged up or bent.
-The springs are all made by comp, but they use different names on them like PAC. The beehive springs are ALL garbage. I have recently done a ton of research on rebuilding my car so i have had a lot of professionals telling me about how they all break and they arent worth the price. I know they are popular here in this forum but it is worth investing in dual springs if you are planning on building this motor up.
-For the rockers, those harland sharp 1.8 rockers are the same ones i went with. They are pretty cheap and they are good.

As far as that top kit you listed goes, i would call summit and make sure it includes the rockers that are in that picture cause it doesnt list them.

thanks for the help mongoose.
iv been looking around everywhere and i here nothing but great things about those beehive springs.as far as the rockers go,i think i got that decided,now just gotta decide on some sprrings.and well the pushrods i think i might loong into swaping them out also cause just to make sure we start fresh with no problems.also can someone explain to me what a oil resistricting PR is?i dont see how this is better..or more efficient. also what about the titanium retainers and seats? my understanding is that we are swapping out to reduce weight and better quality materials.

You could just get some rockers and springs. However, a cam (even a mild one) would make a big difference.

zzp sells stock modified 1.9's for $340

https://www.zzperformance.com/grand_prix/products1.php?id=953

Oil ristricted limits the amount of oil that goes to the rockers, harland sharp told me not to use them as they cause problems. They have a large hole at the bottom and a smaller hole at the top.
The retainers and seats would just be stronger so they wont break.

You could just get some rockers and springs. However, a cam (even a mild one) would make a big difference.

zzp sells stock modified 1.9's for $340

https://www.zzperformance.com/grand_prix/products1.php?id=953


i would avoid those rockers cuz i have heard of a few people sendin them back for fitment issues.

hmmm, thats funny, they've been making the for years for the 3.8, wonder why they're having issues.

i know of 2 people who sent them back because they didnt fit right.

zzp must be slippin up......wouldn't be the first time.

I looked into the ZZP at first but had some problems with them in the past and heard nothing but bad things about the 1.9 RR's so im good on that,
but as of right now..i think imma go with the 1.8 Harland Sharp rockers, and the New Era performance High lift DOD cam package. but all this will be after i get my headers with DP!