non vented to vented opti???
non vented to vented opti??? what all is involved in going from a non vented opti to a vented opti?....i have a 94z and am thinking about going to the vented style but want to know what all is involved and what parts i need?....i am going to be getting a msd opti....
You don't need anything with the MSD opti. It is already vented for the early years. The only time you need to convert anything is if you get the vented opti from GM in which case you would change the cam dowel pin, timing cover, opti, and timing chain if I remember right.
I did the conv. on my last motor... You need to get a 95-97 timing cover, pigtail for the opti, fresh air lines with check vavle for opti, vented opti of corse and change to the dowel pin in the end of the cam
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1) A pre-'95 (type-1, spline-drive) version, and
2) a post '95 (type-2, dowel-driven) version.
-Both versions are vented.
You can run the type designed for your 1994, but you should at least consider converting to the 1995 setup. Converting allows you to run beefier timing sets (double-rollers, etc.), which is otherwise a problem for 1994 model years with the cam-gear spline-drive crap. [Edit -- I should clarify that a 1995+ timing set is required for any 1995+ optispark. The 1994 cam gear is incompatible, unless the center opening is machined.]
Keep in mind that the 1995+ camshafts not only had longer dowel pins, but also an enlarged snout opening to accept an elongated stabilizer shaft on the rear of the 1995+ optispark. I've been told that people have swapped without machining the snout opening, so take that with a grain of salt. However, the MSD comes with a permanently-sealed electrical harness, so you wouldn't have to worry about ordering the 1995 optispark electrical harness.
I run the 1995+ type MSD, paired with a coil conversion. FYI, mine didn't come with vacuum lines -- you'll have to check if the 1994 version supplies them or not. If not, be aware that you'll likely need another vacuum coupler, since the bottom "intake manifold side" vacuum port on the MSD was engineered larger than stock for some odd reason. Some photos here if interested.
Last edited by Alex94TAGT; Dec 24, 2007 at 04:11 AM.
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