1.9 rockers - stock modified
1.9 rockers - stock modified zzperformance is releasing a rocker for the ls1 thats popular in the grand prix GTP market i just found it so i dont know if ne one has already posted but here ya go
http://www.zzperformance.com/grand_p...=953&catid=104
http://www.zzperformance.com/grand_p...=953&catid=104
you are mistaken they modify the stock rockers by moving the seat placment on the rockers(factory) hense the core charge. the price is a little high IMO but its still a cool thought
"These started out as a stock rocker arms. The seats have been welded in and remachined at a new location to achieve a ratio of 1.9 (vs. the stock 1.7). "
i dont think YT offers this modification
"These started out as a stock rocker arms. The seats have been welded in and remachined at a new location to achieve a ratio of 1.9 (vs. the stock 1.7). "
i dont think YT offers this modification
i have not found these through ne other sponsers so hope it dont get locked. Just something new i know they were awsome in the GTP market instead of getting a small cam put these on with out opening up the motor. 1.9 should net around .060 lift on a 98-2000 ls1 cam little less on the 01,02 cam .055 correct me if i am wrong or if there is a sponser that sells these.
true but YT failed miseriably in the 3800 market as 1.9 alum shavings all in the heads on most cars i have even seen some break. these are just bolt in and go well prob need new springs ls6 as lift would be close to 02-04 zo6 cam. lol im not selling these as i do not know all the facts and cannot argue on their behalf.
funny thing is they seem to be working just fine on alot of the aussie cars. everyone has had rockers break. normally it is not from bad quality. usually its abuse, installation, mismatch of parts.
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Aren't the stock rockers prone to deflection? Wouldn't this get worse at a higher ratio and risk breakage and possibly "very minor" power loss at high loads (especially considering a stiffer spring should be used)? How much power would these make over... say Comp Cams Pro Magnum 1.85:1, which are chromoly?
"Dynoed with no other modifications done to the truck and gained 18 HP to the wheels! Dyno test was done on a 1999 5.3 liter GMC 1500"
5.3 cams have a valve lift of around .466/.457 on a 1.7 ratio rocker, which would be .523/.511 with a 1.9.
98-2000 f-bodys with the bigger cam which is .496/.496 lift on 1.7, which would be .557/.557 with a 1.9.
01-02 f bodys lift would be .524/.536
as for deflection on stock rockers i cannot speak on something i know nothing about maybe some one with more knowledge on this matter will chime in. as both test vehicles were 5.3's it is possiable a problem could arrise when you get into the higher lift of the early f-body cams with the high ratio of the rockers. if they could be used would be a sweet altertaniative to swapping to a z06 cam for those of us in FI applications.
"Bolts in exactly like stock. No modification needed for install. Direct bolt on affair. 1 Hour install time! A great simple alternative to installing a cam. No loss in fuel consumption and in some instances we have improved fuel economy."
5.3 cams have a valve lift of around .466/.457 on a 1.7 ratio rocker, which would be .523/.511 with a 1.9.
98-2000 f-bodys with the bigger cam which is .496/.496 lift on 1.7, which would be .557/.557 with a 1.9.
01-02 f bodys lift would be .524/.536
as for deflection on stock rockers i cannot speak on something i know nothing about maybe some one with more knowledge on this matter will chime in. as both test vehicles were 5.3's it is possiable a problem could arrise when you get into the higher lift of the early f-body cams with the high ratio of the rockers. if they could be used would be a sweet altertaniative to swapping to a z06 cam for those of us in FI applications.
"Bolts in exactly like stock. No modification needed for install. Direct bolt on affair. 1 Hour install time! A great simple alternative to installing a cam. No loss in fuel consumption and in some instances we have improved fuel economy."
"Dynoed with no other modifications done to the truck and gained 18 HP to the wheels! Dyno test was done on a 1999 5.3 liter GMC 1500"
5.3 cams have a valve lift of around .466/.457 on a 1.7 ratio rocker, which would be .523/.511 with a 1.9.
98-2000 f-bodys with the bigger cam which is .496/.496 lift on 1.7, which would be .557/.557 with a 1.9.
01-02 f bodys lift would be .524/.536
as for deflection on stock rockers i cannot speak on something i know nothing about maybe some one with more knowledge on this matter will chime in. as both test vehicles were 5.3's it is possiable a problem could arrise when you get into the higher lift of the early f-body cams with the high ratio of the rockers. if they could be used would be a sweet altertaniative to swapping to a z06 cam for those of us in FI applications.
"Bolts in exactly like stock. No modification needed for install. Direct bolt on affair. 1 Hour install time! A great simple alternative to installing a cam. No loss in fuel consumption and in some instances we have improved fuel economy."
5.3 cams have a valve lift of around .466/.457 on a 1.7 ratio rocker, which would be .523/.511 with a 1.9.
98-2000 f-bodys with the bigger cam which is .496/.496 lift on 1.7, which would be .557/.557 with a 1.9.
01-02 f bodys lift would be .524/.536
as for deflection on stock rockers i cannot speak on something i know nothing about maybe some one with more knowledge on this matter will chime in. as both test vehicles were 5.3's it is possiable a problem could arrise when you get into the higher lift of the early f-body cams with the high ratio of the rockers. if they could be used would be a sweet altertaniative to swapping to a z06 cam for those of us in FI applications.
"Bolts in exactly like stock. No modification needed for install. Direct bolt on affair. 1 Hour install time! A great simple alternative to installing a cam. No loss in fuel consumption and in some instances we have improved fuel economy."
I think the reason that they are so popular with the W bodies is the fact that they are really the only other alternative. They dont have huge amount of manuf jumping at the chance to make something new. Plus, after you have done all you can on the s/c side and gotten a cam, what else is there?
