Im putting a set of 1.88 in place of a std. 318 intake valve and just dug out my 1.88 valves.

The length is correct, a test lap shows great pattern but then I noticed its got a 4 groove lock.

I tossed the boxes long ago.

Did they make a 4 groove 1.88 intake or do I have some sort of 1.88 ex. valve? It does not have a wider margin then the 1.78 oem?

So whats up? And if this is in reality an ex valve, could I still use it as a HD intake?

Any input would be great as im not well versed in this area.

Oem 1.78 is 117 grams, this 1.88 is 123 grams.

Thanks.