comp cams: .464in .464ex .222'in .226'ex 114 lobe sep.
comp cams: .480in .488ex .206'in .212'ex 112 lobe sep.
comp cams: .488in .495ex .212'in .218'ex 112lobe sep.
crane cams: .452in .465ex 214'in 220'ex lobe sep 112
5.7TPI
3.27 posi
headers&catback
afpr
ported plennum
stock heads
which one u vote for or do u suggest any other candidates??

 

I'd go with the 212/218, and you'll need new valve springs to handle that lift.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

i thought from all the research ihave done that stock springs will handle up to .490 lift?? any other voters???

 

I heard they'll handle up to .480" lift, and depending on the age/mileage of your engine, you'll want to replace them anyway just because.

 

Get the matching valvesprings. Kevin's right on about the cam & springs.

 

how hard is it to replace the springs while i am there??? any special tools needed? any other voters???

 

If you have torn down to the point where you can see your lifters, you might as well just pop the exhaust manifolds off and remove the heads. Then, you can use a spring compressor from Sears and do the changeout in one day. You'll want to get yourself some new valve stem seals, a bag of shims, and a machinist's scale for setting up the springs. You install the retainer without a spring, and measure the distance to the valve stem seal. Add .050" and this is the maximum lift to valve stem interference. If this lift is greater than your valve lift with the new cam, you are in great shape. Now, measure the distance from the spring seat to the retainer. This is your installed height. Add shims to the seat to yield the recommended installed height; typically 1.7 to 1.85 inches. You want to also be aware of the max lift of your new spring: Add .050" to the compressed height and be sure that with the installed height you have chosen (1.75" for instance) that at max valve lift, you don't fall below the compressed height plus .050". For instance: Take a valve spring with, oh, say, 1.20 inches compressed height. Add .050" to this. That makes 1.250 inches. Subtract this from the installed height of 1.750 inches. You now have a max valve lift of 0.500 inches. As long as your cam keeps the valve lift under .500" you wont experinece coil bind.

Now that you know your installed height, and how much lift your new springs can handle, you can just add the shims to each and every valve, setting up the installed height, until you are done. Measure each height individually! When you are finished, you can install your head with a new head gasket, bolt on your intake manifolds, and finish up the cam installation.

While you are in there, you might want to mock up the head and check valve/piston interference... but that's a DIFFERENT post. I'm out of time!

Bye for now! For more information, you can always look at:
http://www.isthq.com/~dan/305HO.html http://www.isthq.com/~dan/ported.html


------------------
Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.