I know that P90 heads have solid adjusters. Some of the P90A heads have both solid and hydraulic lifters. I am wanting to convert a hydraulic P90A head to solid lifters/adjusters. Are the solid adjusters on a P90A the same size (dia) and thread pitch that are in the P90A? How about the solid adjusters on the P90A head. Are these the same size and thread pitch that are used by the hydraulic lifters? I know you cannot use the older-style solid lifter/adjuster on the P90A head. How about the solid adjusters on the P90 or P90A head?

I believe you can convert a P90A to a P90 just by swapping parts.

Will

PS, I will see what I have on the valve train in the '83 FSM, and I will ask the local dealer if there was a manual specific to the P90 or P90A, if so, I will get them if they are available.

Will

Great! Let me know if they can get the adjusters, too! I am guessing this is the way to solve my problem. Vernon at Raver Motorsports told me to get a hydaulic cam and install it. I really do not need a stock camshaft in the engine. I hope you can find me some solid lifters for the P90 or P90A!!!

I have the local dealer checking-Nissan Publications has been buisy when I have had them check-otherwise I would have the info for you already-they will keep trying until they find an answer for me-I asked them to check the parts too. I will drop by tomorrow and put an in person visit on the books-they are great guys, but they get buisy too.

Will

I am hoping they come up with a good response. I just want to know what the solid lifter looks like in the P90A head. I hope it is the same as the hydraulic!

I am guessing the P90 head is different. The P90A head has a larger diameter threaded hole for the hyd. lifter then the P90 head has for the solid lifter. Too bad they did that. It would have been nice if the heads were interchangeable.

I am waiting for a pamphlet we ordered from Nissan Literature-hopefully it will have all in it!

Will

I am hoping I was wrong and you find out good info about these heads!

I am hoping I was wrong and you find out good info about these heads!

I know you posted a question on HybridZ, did you see this post?:

http://forums.hybridz.org/showthread.php?t=96799&highlight=p90a+solid+lifters

Suspicians confirmed! I am looking for a set of bad hyd. lifters to modify. I will put in the hyd. cam and see if my problems are solved. If not, we will modify these lifters to work. Thanks for the post. I just needed confirmation that the P90A hydraulic head is unique.

ZSaint I have a P90A as well that I wouldn't mind converting if it didn't cost too much. I've been watching the P90 solid lifters on eBay and they are too pricey for me. Keep us informed of how it's going.