Timing Chain/Vented Opti Question
#1
Timing Chain/Vented Opti Question
Looking at doing a cam swap and making a list of things I need to buy. When I look for a timing chain this is all that shows up: http://sdparts.com/details/gm-perfor...parts/12370835
Do I have to get that and convert my car to a vented opti and all that BS in order to get a new timing chain? It looks like to convert to a vented opti it is going to cost about $500 everything... If I really do have to convert it to a vented style is there such a kit that someone sells that includes everything necessary?
Thanks in advance! And yes I did try lol.
Do I have to get that and convert my car to a vented opti and all that BS in order to get a new timing chain? It looks like to convert to a vented opti it is going to cost about $500 everything... If I really do have to convert it to a vented style is there such a kit that someone sells that includes everything necessary?
Thanks in advance! And yes I did try lol.
#4
TECH Veteran
If you are going to run a non-vented opti, you are pretty much stuck with a stock timing set, because the opti requires the splined cam gear to turn it. If you go with a vented opti conversion, your options increase and if you add an electric water pump, your options will include any SBC roller cammed set.
#6
TECH Veteran
Pre-written blurb:
If you want to change to a vented from non-vented, you have to do many things. It may not be cost effective unless you are doing a cam swap at the same time.
Besides the optispark itself (GM p/n 1104032), you need:
- 95 or later timing cover [1995 front cover (includes round seals) GM p/n 12552426-now discontinued]
- late model or aftermarket cam (or have your cam modified by drilling the hole in the front to the proper size [.500"dia. X 1.0625" deep] and a longer dowel pin added (pin needs to protrude ~.650" from the nose of the cam)
- 95 and later optispark electrical harness GM p/n 12130319 (cheaper aftermarket harnesses available)
- optispark vacuum harness GM p/n 12555323
- vacuum fitting [GM p/n 14082470] or "tee" to provide vacuum for the opti
- 95 or later timing set components (or at least the cam gear) cam gear (GM p/n 10206039), crank gear (GM p/n 10128346), chain (GM p/n 10128485)
- timing cover gasket GM p/n 10128293
- water pump gaskets [2] GM p/n 10128343
- intake manifold gaskets if you are pulling the cam GM p/n 12524653
Or you can put an MSD cap/rotor kit on it and essentially have a vented opti. They come with their own similar venting system.
Trending Topics
#10
What options do I have for timing chains besides the GM one? Do I have to get the GM timing chain set in order to swap to a vented opti or can I buy something cheaper instead? (like this: http://www.summitracing.com/parts/LUN-93094/ )
#14
I'm looking at this one http://m.summitracing.com/parts/NAL-12371043 for less.. I also will run an EWP though ...
I know I am kind of all over the place, but I think what I would like to do is:
1. Run a factory style water pump (not electric)
2. Run a vented opti
3. Find the best deal on a timing chain possible (of course)
My opti died this weekend so I am going to go ahead and just put a vented setup in it... I guess I have plenty of time now. Haha