Review posted
Reviewed by mike l.
Verified Buyer
Great product. Good design
These made the install 100 times easier then factory design 10/10 recommend
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What they have done is actually quite simple, they made valve guides that fit properly, are easier to install, and shaped to help air flow instead of just copying the OEM design. The GSC Power-Division valve guides are made from true C67410 Manganese Bronze and turned on a dedicated precision CNC turning center. What this means for you and your installer is less time fitting guides to the head due to holding the tightest tolerances in the industry with the best quality control possible.
The stopper style is simply what it says. It has a stop integrated into it so that it wont get pushed in to far. Most machine shops have to drive and check multiple times to get the proper protrusion, these have it built in.
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These made the install 100 times easier then factory design 10/10 recommend
Awesome guides the stopper style makes life easy!
If you’re looking for TOP NOTCH components for your heads, look no further. GSC Power Division makes superior products that you can trust. When you’re looking to make serious power in a Subaru, +1 valves are the way to go, especially with the addition of a bigger cam. By adding GSC’s valve stem guides and viton seals, you also get better airflow and a sure fire seal. If you’ve got your engine out, or are building, just do it.
The machine shop was happy to see these with the stop and all being in great shape minimal honing need to get into correct spec.
Recommend to me by a reputable shop when building my heads