In looking at everyones mod's - I dont see guys replacing rocker arms - or changing ratios on the exhaust to 1.8 - is this a valuable mod - anyone done it ? -
which manufacturer ? - hp gain ?
I did 1.6 rollers on my 91 TBI motor and def made a diff.
Thought I'd throw this out there

 

I tried a set of crane 1.8 roller rockers. For the cost, I would definitely spend my money elsewhere. Didn't feel much of a gain and they help wear down your springs faster. From what I've heard, swapping springs out really sucks. I'm going to be installing some 1.7 yella terras this week, I'll let everyone know what I think of them.

 

I PUT 1.85 COMP CAM ROLLER ROCKERS IN MY 4.8L
KNOCKED ABOUT 2 TENTHS OF A SECOND OFF MY 1/4 MILE TIMES. IT ALSO CHANGED THE DURATION OF THE EXHAUST, AND INTAKE. HAS MORE LOPE TO IT NOW THAN IT DID. MADE MY TRUCK SOUND MORE LIKE A CAMARO OR FIREBIRD EXHAUST IN MY OPINION. TRUCK ROCKS BACK AND FORTH EVER SO SLIGHTLY. USED TO THE ANTENNA WOULD NOT MOVE WHEN I WAS AT IDLE NOW IT ROCKS BACK AND FORTH SINCE THE MOD. THE ROCKERS COST ABOUT $450 BUT I BOUGHT THEM HERE IN HOUSTON AT TEXAS PERFORMANCE. I DIFFENATLY LIKE THE CHANGE IN THE WAY THE MOTOR SOUNDED. KINDA LOST THE SOUND THO WHEN I HAD THE X-PIPE INSTALLED, BUT I THINK I CAN HEAR IT COMING BACK A LITTLE. THEY SAY IT WILL GIVE YOU ABOUT 20 HP BUT I DID NOT DYNO TO MAKE SURE AND HAVE SINCE ADDED OTHER MODS.I CAN ONLY GIVE YOU A SOTP DYNO AND I DID FEEL A DIFFERANCE IN POWER.

 

well i can tell you if you use jessels they are a pain. because they will not fit under the valve cover. i think the yt's are cheaper and fit under the valve cover also. but i am talking about shaft mounted stuff.

 

i think i heard a while back that this would take care of the "piston slap"?

 

silent
please let us know what you think after your install - this is one mod I was thinking about.

 

I thought it changed your lift numbers , not you duration

 

SOMETHING LIKE THAT IM SORRY. THE WAY IT WAS EXPLAINED TO ME WAS THAT THE LARGER SIZE ROCKER ARMS HOLD THE VALVES OPEN LONGER THAN THE STOCK ONES DID. DOES THAT SOUND ABOUT RIGHT? I NOT TRYING TO CONFUSE ANYONE JUST TELLING WHAT I WAS TOLD.

 

Yes, in turn to lift open the valves more, it causes in turn to increase the duration ever so slightly. It is just like putting in a mild cam. Not a bad mod to keep from taking your heads off the truck, but a very little gain compared to taking off the heads. It's kinda of like, if there is any reason your head needs to come off, then by all means that is time for a new cam!

 

One of the best things about the Gen3 is you don't even have to take the heads off to do a cam swap.