1.6 rr ?
None if it's done correctly. 
Seriously, you have to trim the OEM valve covers for clearance (on most brands of rockers) and you NEED to change the valve springs. Other than that it's a pretty straight swap.
There is a lot of things to screw up if you don't know what you're doing though.
Seriously, you have to trim the OEM valve covers for clearance (on most brands of rockers) and you NEED to change the valve springs. Other than that it's a pretty straight swap.
There is a lot of things to screw up if you don't know what you're doing though.
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From: Rochester, NY
What RamAir95TA said. Piece of cake swap, trim the inside of your valve covers with a dremel or a pair of tin snips. Swap in a good set of valve springs while the rocker arms are off since the stockers are junk.
Only issue I ran into with the valve spring swap was finding a compressor that works on double springs in tight spaces.
I rented a KD tool to get the stock springs off, then bought a cheap 'lever type tool' to install the front 8 springs, then made my own 'Tim's tool' to do do the back 8 springs under the windshield.
Only issue I ran into with the valve spring swap was finding a compressor that works on double springs in tight spaces.
I rented a KD tool to get the stock springs off, then bought a cheap 'lever type tool' to install the front 8 springs, then made my own 'Tim's tool' to do do the back 8 springs under the windshield.
GMPP 1.6 SA's do NOT require any modification to the valve cover as I had a set of those. But anything beyond that, say a Pro Mag did need modification to fit.
I always recommend swapping springs, even be it slight improvement, its better for valve control. We had a local kid not swapping springs over and never an issue but no need to push your luck.
I always recommend swapping springs, even be it slight improvement, its better for valve control. We had a local kid not swapping springs over and never an issue but no need to push your luck.
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From: Rochester, NY
The roller rockers are a bit noisier than the stock arms-- if you open the hood while the cars idling, they sort of sound like a "sewing machine" in the back ground. Not obnoxiously loud, atleast my Pro-Mags aren't.
You'll see a small gain in power, 10-15ish, especially up top if you swap in good valve springs, too.
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Joined: Oct 2006
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From: POULSBO WA.
I use the 96 lt4 rollers and the stock springs for 4 years now, and go to the track. Have never had a problem direct swap although i should replace the springs (186k). I saw 2 tenths or 20 horse improvement over stock. I dont think i will ever convert from the speed density setup!
52mm TB will help if you have a free flowing exhaust and intake, but it's not worth much. No noticeable difference on a stock vehicle.
U/D pulley: maybe 2hp. It has an advantage of slowing down the accessories though if you have a high revving built engine or if you road race it.
OBD 2: I have no idea why you would want to do that. I converted mine from OBD2 to OBD1 just for ease of tuning (much cheaper software at the time). All B-bodies had Mass Air, whether OBD 1 or 2.
Mass Air is nice, but I wouldn't bother with it if the car wasn't already set up with it. Is that why you're thinking OBD2?
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On The Tree
Joined: Sep 2011
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From: delaware
ok FAD2BLK93 how many miles didnt you car have when you didnt that. bowtienut and i have cold air intake and and 3' out the back so i think the 52mm bbk would help alot and how is going from a obd2 two obd1 better for tuning i use to have a 02 firehawk i had hp tuners
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Joined: Oct 2006
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From: POULSBO WA.
I got this car with 122k on the odo and now it has 186k no problems. It seems when designers went to obd2 the made things more complicated with more variables to tune...i stay away from handheld tuners and have pcmforless do mine, they are first rate never an issue. Long live OBD 1.
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From: Rochester, NY
Underdrive pulleys do almost nothing, and a 52mm throttle body will only give you a few horsepower on a stock motor-- not worth the $300 to me unless its going on with a new cam, or all the rest of the basic bolt-ons have already been done.
Roller rockers and valve springs will give you more power than a bigger throttle body and underdrive pulleys. Pair that up with headers and a custom tune and you'll have a noticeably quicker car.
Roller rockers and valve springs will give you more power than a bigger throttle body and underdrive pulleys. Pair that up with headers and a custom tune and you'll have a noticeably quicker car.