So like the title states, I need to replace my intake valves on my p8r head, will the 89-93 prelude valves be direct fit? Also I will be doing valvetrain upgrade using crower retainers and springs. Will they be direct fit? Thanks

 

I'm in the same boat man, it's widely said that the 88-91 lude valves work. I am however looking for flat faced stainless valves, if I can find some for the intake side, and if not I'll just use my stock valves

 

damn =/ I need to replace two of my intake valves asap….sigh

 

From what I've researched, the b20a intake valves work, but apparently they are 1mm longer than the P8R valves. It would be a good idea to purchase one or find one in a junkyard, compare them, if you think it'll work, buy more. I've learned that people on this site tend to give you the runaround, its always "use the search button" but using the search button doesn't always give us a definitive answer. Especially for people wanting to build nonvtecs.

 

Part number for the P8R intake valves:

14711-PR4-A00

Exhaust:

14721-PH3-000

Here was my source:
http://www.nonvtec.com/forums/p8r-va...c73bb87e9cbf56

You kids need to learn how to search more before asking questions, the P8R has been covered extensively on nonvtec.com Now before you assume my information is correct, do yourself a favor and search more to make sure it's 100% correct or spend your money and sit there with the wrong parts. I know how I feel when the seller sends me the wrong parts, I can't imagine how it would feel if I were the idiot that ordered the wrong ones...

 

Joeblue you are incorrect sir, that part number is for the 31mm intake valves, the P8R heads have 33mm intake valves. On a side note I k ow how to use the search function, but since people rarely use these heads for builds, definitive answers are few and far between. There us a check of a lot more incorrect info on these heads than correct. And I find it funny that I post about people saying learn to search, and of course you say it in your post.

 

Save your ego trips for someone that will care.

I gave you the link to the site that would have your answer for you already. There is a reason few people use those heads for builds, and it has a lot to do with the cost vs power expectations. The P8R head is not worth the cost to build when the VTEC heads are just a tiny bit more expensive and far more efficient in every aspect in the long run.

I will say it to you until members learn how to search the internet, not just Honda-Tech, and stop polluting the forums with stupid questions that have been answered already.

 

I am more than aware you are not the OP. I'm not an idiot, and would prefer it if you did not make that suggestion in the future.

The man needs to look at another site to get the answers he wants, as they are not available on Honda-Tech, had he done the search he would have known this.


240HP from a non-vtec engine is easy for under $1k. It's called nitrous. The real question is whether or not it's worth the time and effort to putz around with a P8R head, and I say no. If you're going non-vtec you will need more stroke or a significant bump in DCR to make up for the lousy head. Both of the heads suck horribly and it's not that the valves are smaller so much as the entry angles for the ports. The vtec heads simply have a better alignment of ports to bore and entry angle. Half of the flow difference is likely caused by this difference alone.

Look, if the OP wants power he should look at picking up a clean B16 head, Hmotorsonline has some for $550. That is the price of cams and the gears to go with them for a decent setup on the non-vtec for an entire head that only needs a dizzy and solenoid from what I can tell. A way to tune this and some pistons and at the very least ARP rod bolts with new bearings...

So for around $1200 he can go from shitty LS non-vtec setup with maybe hitting 160 HP at the wheels to a setup that should be able to take him to around 170HP at the wheels with far greater growth potential in the future.

So seriously, why would you recommend a crappy setup to a guy that has obviously limited funds and will likely only be able to do this build once?

Outside of of ego I see no reason for that sort of reply.

 

Only thing I can find in the japanese honda epc using a p8r head was a S-MX, intake valve part number is 14711-P0G-A00.