tdurr... ...the point is just to find out if there is a difference between model and year A20 (PJ0) heads.
pico... ...that's a major part of the reason I really went digging here. Those pics of tdurrs retainers on the bisi spring scares the shit out of me. I'd like to show that pic to any reputable machine shop around here, then quickly take a step back to dodge the bitchslap coming my way. So the quick answer to your question is YES, I would ONLY use the bisi springs with the larger retainers pictured in A20A3's pic in my first post. ...and it's looking like that's from an 86-87.
Those outer springs need more than just a washer at their seat. Then need a step on the seat to keep the spring centered on the stem. The inner should also have a locator (second step) to keep them on center, and keep them from scrubbing the inside of the springs and/or thrashing the seals and stems. Same goes for the retainers. As you can see in the pics I posted up in my first few posts, the stock retainers for the larger springs (which it's looking like are found on the 86-87's only, and still pending the exact models from 86-87), have what looks very much like a locator which would keep the center spring where it belongs, and it would work perfectly with the outer springs.
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