I had the comp cam roller rockers in my '96, it was a good upgrade, improved top end power and pull, and also the power hit right away not that 1.5 second delay the stock engine had... at that time you couldn't put a cam in as well, too much lift but I'm sure someone's figured out how now, anyhow here's some info on the cam cams rocker setup, I'm pretty sure they have a set for the ohv now, before you had to break up sets for a V6 engine.
Here's colins e-mail to me, i didnt feel like hacking it up, so here goes...
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hey guys, heres the info you requested. please print this out. ive also
attached two pics, have to appologize about the hand drawing its late, you
get the picture....
colin.
Info for installing a set of roller rocker arms on gm 2.2L (L4)engines. And
gm 2.8L/3.1L 60 degree V6 engines
COMPETITION CAMS offers MAGNUM Roller Tip Rocker Arms. Available in a
1.52:1 (part #1413-12) and 1.6:1 (#1414-12) These rocker arms are a stiffer
construction rocker arm that have a roller tip that comp claims a 10-30 hp
increase over stock,-due to the increased stiffness and the reduced friction
of the roller tip. Id say more around 10hp at the most.
CRANE CAMS offers a full roller rocker. It is their GOLD RACE Extruded
Narrow Body roller rocker. (for 60* v6 and center bolt v8 engines) it is an
all aluminum needle bearing roller fulcrum and roller tip rocker. $$$ very
pricey. It is available in a 1.5:1 (#25750-12)and 1.6:1 ratio (25759-12) but
require cranes replacement nuts #99795 and studs 99148-12.
the comp rockers will work for the L4 engines, havn't tryed the crane ones
on the L4 engines yet. they should be no problem though.
All part numbers that have a -12 behind them are quantities of 12 (v6), for
the four cylinders I would look into seeing if you can get them in
quantities of 8.
2.2 L4 info
The cam lift of the 95-97 cams is .288" the amount of valve lift for the
different ratios are:
1.5 (stock)= .432" valve lift
1.52 =.4377" valve lift
1.6 =.4608" valve lift
v6 info
cam specs for a 92 3.1L
lobe lift intake .2626"
lobe lift exhaust .2732"
stock 1.5 = .3939"int. .4098"exh.
1.52 = .3991"int. .4152"exh.
1.6 = .420"int. .437"exh.
to find valve lift from any cam when using different rocker arms take the
known valve lift example .410" and divide by the rocker ratio 1.5 =
.273333333333 this is the cams lobe lift, then take the new ratio example
1.6 and multiply it by the lobe lift. .273" x 1.6 = .4373" valve lift. If
you only know the lobe lift of the cam just multiply it by the rocker ratio
to find valve lift.
If going with the comp cams rockers, The first thing you need to do for this
swap is get a set of M10 studs from a 2.8 v6, gm part number for these studs
is #476530. these studs were sourced from a 89 2.8L chevy celebrity. At my
dealership (in Canada) they retail for $5.55 each. V6's will need 12, four
cylinders will need 8 of them. The threads on these studs are
M10x1.5x9.9/M10x1x18 these are a fully adjustable stud that were used on the
v6s. these studs will compensate for the different ratio rocker. The stock
rocker studs are non-adjustable and are a M10x1.5x9.9/M8x1x.32 the M8
non-adjustable stud will NOT work with these rockers.
The comp cams rockers come with new 10mm nuts.
If using the crane full roller rockers then you need to get cranes studs
which have a M10x1.5x9.9/ 3/8x24 stud. And cranes nuts #99795.
If going with the 1.6 ratio rockers you will need a set of aftermarket high
performance valve springs to accommodate the higher lift. New pushrods are a
must, as the old pushrods and rockers have worn specifically to each other
and using old pushrods with new rockers can cause premature wear along with
voiding the warranty of the rocker arms from the company. Factory pushrods
will work fine.
VALVE ADJUSTMENT:
You must find top dead center (tdc) for piston number one. you can do this
by removing the spark plug and by hand turning the engine over at the crank
pully until number one is at the top of the cylinder, use a screw driver in
the plug hole to feel the piston. While cranking the engine over pay
attention to the rocker arms, if when the piston is moving up towards tdc
and both rocker arms are not moving then the engine is on number one firing
position if one of the rockers moves while coming up to tdc then the engine
is on number four firing position, and needs to be cranked over one complete
revolution. To make things easier while at tdc for number one piston use a
paint marker or a center punch to make a refrence mark on the crank pully
and timing cover. This will make finding tdc for number four easier to line
up. Now remove your old rockers, replace the studs, and pushrods.
PROCEDURE FOR L4 ENGINES:
With number one piston on the firing position at tdc install the rockers on
the studs, the valves that can be adjusted are:
EXHAUST: 1, 3
INTAKE: 1, 2
Tighten in the adjusting nuts until all lash is removed. This can be
determined by rotating the pushrod while turning in the adjusting nut. Once
the play has been removed, turn in the adjusting nut one-half turns to
center the lifter plunger. Now crank the engine over one complete revolution
to number four firing position. These valves can now be adjusted:
EXHAUST: 2, 4
INTAKE: 3, 4
Install your rocker cover.
ADUSTMENT PROCEDURE FOR V6 ENGINES:
With number one piston on the firing position at tdc install the rockers on
the studs, the valves that can be adjusted are:
EXHAUST: 1, 2, 3
INTAKE: 1, 5, 6
Tighten in the adjusting nuts until all lash is removed. This can be
determined by rotating the pushrod while turning in the adjusting nut. Once
the play has been removed, turn in the adjusting nut one-half turns to
center the lifter plunger. Now crank the engine over one complete revolution
to number four firing position. These valves can now be adjusted:
EXHAUST: 4, 5, 6
INTAKE: 2, 3, 4
I have done this swap with comp cams magnum roller rockers on my 92 sunbird
GT. I used the 1.52:1 ratio rockers.
I have yet to perform this procedure on a L4 engine but the info I have
researched for this was for a friend of mine, he has yet to do the new
rocker arms.
I am not responsible for any damage to engine parts if proper procedures and
such are not followed.
Colin
V6performance@hotmail.com
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Jeff, the PN for the studs is - #476530 - we'd need 8 each, so i guess if we got 2 sets of the V6 rockers, and split it 3 ways, we'd need 24... Also, Colin reccomends Pushrods, so, stock pushrods for a 2.2, look for them aswell, and see what kinda price we can get for 8 each...
Looks like the Rockers come with nuts... so i guess thats covered...
Long e-mail, but worth a read...
Gus...
Don't buy from MANTAPART!!