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02-28-2005, 05:23 PM
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#1
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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Rockers
Im thinking about stepping up to a set of ZZP rockers, since ive read many good things about them (119whp at 5800 rpm stock, with rockers added 183whp at 5800 - www.easyperformance.com ).
Whats involved in changing the rockers, what other stuff would i need (gaskets, seals, etc) to complete the job, and about how long would it take to do?
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Matt
B18B1 FTW
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02-28-2005, 05:28 PM
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#2
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14 Second Club
Join Date: Aug 2004
Location: RUM$ON, NJ
Posts: 2,308
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I dont know about changing rockers while the engine is IN the car but changing while the engine is out is easy. All you really gotta do is pop off the valve covers, unbolt the old ones, pull them off. and torque the new ones down to 11 ft. lbs (on the 18-87 5.0 and 86-87 5.7). Then just put the valve covers back on and fire it up.
Oh and double check the torque settings before doing it.
It should take more than an hr.
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Quote:
Originally Posted by The Fapist
K0ll is a hick and has a veritable fleet of 1980-early 90's GM vehicles :mullet:
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02-28-2005, 05:44 PM
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#3
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Join Date: Aug 2004
Location: Somerset County
Posts: 5,559
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should or shouldnt take more than an hour?
and that's a ****load of horsepower just by changing the rockers...u sure they didnt stab a cam in it at the same time?
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1999 Corvette FRC
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02-28-2005, 05:47 PM
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#4
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14 Second Club
Join Date: Aug 2004
Location: RUM$ON, NJ
Posts: 2,308
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Oh yeah. I forgot to comment on that. I think youll free up at most 5 hp, realisticly
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Quote:
Originally Posted by The Fapist
K0ll is a hick and has a veritable fleet of 1980-early 90's GM vehicles :mullet:
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02-28-2005, 06:10 PM
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#5
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,473
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Are those the 1.9 ratio rockers? And yes, he quated the wrong power numbers on that one.
I don't remember the tq. specs, but I think you don't have to worry about setting valve lash on the 3.8...
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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02-28-2005, 06:26 PM
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#6
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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Numbers are correct, no other changes....i think they were split ratio rockers, 1.8 intake, 1.85 exhaust. the L36 has **** for top end, thats why it opens up so much, i asked a guy i know that used to have a GPGT like mine, he said the numbers are pretty accurate. the engine falls on its face at 5000RPM basically. i'd be doing them while the motor is in the car, the front rockers would be easy but i dunno about the rear.
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Matt
B18B1 FTW
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02-28-2005, 06:28 PM
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#7
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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not sure if these'll hotlink, but i'll try...
Stock 1.6 rockers, u-bend delete, 180 t-stat:
ZZP ER Rockers, u-bend delete, 180 t-stat:
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Matt
B18B1 FTW
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02-28-2005, 06:48 PM
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#8
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I will beat you with a toaster!
Join Date: Sep 2004
Posts: 6,054
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OK well a gain of 16 Horsepower, however for the second run the humidity was a little lower also, so that may have a small effect. Raised the top power RPM too, so I think the biggest problem will be doing the back ones (not knowing what your engine bay looks like) but, i would say if you want the extra HP and dont mind throwing down the money...go for it. I'd want to see back to back dyno pulls so all the weather would be relatively the same and get a better idea for how much power truly was increased...
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02-28-2005, 06:53 PM
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#9
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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Quote:
Originally Posted by bad64chevelle
OK well a gain of 16 Horsepower, however for the second run the humidity was a little lower also, so that may have a small effect. Raised the top power RPM too, so I think the biggest problem will be doing the back ones (not knowing what your engine bay looks like) but, i would say if you want the extra HP and dont mind throwing down the money...go for it. I'd want to see back to back dyno pulls so all the weather would be relatively the same and get a better idea for how much power truly was increased...
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yeah, i'd definitley get a dyno before and after..maybe not on the same day but maybe if someone wanted to do the rockers in the TTP parking lot or something
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Matt
B18B1 FTW
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02-28-2005, 08:24 PM
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#10
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I will beat you with a toaster!
Join Date: Sep 2004
Posts: 6,054
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I would wonder, I mean since those conditions and time spacers were a bit spread apart there could be other factors. I am only saying this because you may find that you wont gain that 16 HP and it may be like 5-10. What I do like is the broader power band with the rockers
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02-28-2005, 08:59 PM
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#11
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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Quote:
Originally Posted by bad64chevelle
I would wonder, I mean since those conditions and time spacers were a bit spread apart there could be other factors. I am only saying this because you may find that you wont gain that 16 HP and it may be like 5-10. What I do like is the broader power band with the rockers
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thats my main reason for wanting them, because the top end is blowtastic. i love the new power curve it gets with them.
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Matt
B18B1 FTW
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03-01-2005, 08:55 AM
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#12
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11 Second Club
Join Date: Jan 2005
Location: Fishkill, NY
Posts: 1,278
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I think 16RWH from a rocker change is pretty close. Biggest things I would worry about is uograding valvesprings and retainers while you are in there, no reason not to and it is piece of mind. Even changing springs you will probably be looking at 2- 3 hours worth of work. Only trick to springs is keeping the valve from falling in the engine. Normally you can get a fitting for your air compressor and use it to pump air in the motor, keeping the valves in the closed position. I'd spend the extra time and money on springs, but it is up to you.
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-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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03-01-2005, 01:12 PM
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#13
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,473
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Lots of guys who get those rockers just order up a set of LS6 springs for $35ish...
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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03-01-2005, 05:04 PM
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#14
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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Yeah, the LS6 springs are the recommended upgrade for them...except from Intense racing, they are $95...show me these $35 LS6 springs :P
I dont know if i could do the springs myself, since i dont have an air compressor or anything.....unless someones got a garage and wants to help me out. I dont plan on doing this til the spring anyway...for now im doing some exhaust work.
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Matt
B18B1 FTW
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03-01-2005, 05:30 PM
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#15
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NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
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just make sure you get the appropriate tuning done to take full advanatage of the new rocker ratio. you can prolly get double teh gain with tuning as without.
later
tim
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