Cylinder head codes

Post by **NafemanNathan** » Thu Sep 13, 2012 8:35 pm

Sorry Matt, I tried to get this thread back on track

M@dds · Post by **M@dds** » Thu Sep 13, 2012 9:31 pm

Lol that's ok dude

Cheers

Post by **Merlin** » Sat Sep 15, 2012 1:48 pm

Buzzonion Vtec wrote:
H22a8 = P13 head same as JDM H22a, a2 and a5
H22a7 = PDE head
H22a (S-spec) = P5P head

http://preludeuk.forumup.com/viewtopic. ... =preludeuk

Post by **Thebusofwoe** » Sat Jun 06, 2015 11:10 am

Can i bump this thread with the question, does anyone know the difference between the A2 p13 and the P5P head?? I got the Type S motor from Sam and just wondering if its worth my while spending the money on that head??

mercutio · Post by **mercutio** » Sat Jun 06, 2015 3:45 pm

the type S head has some mild work done to the head and different valve angles iirc plus it has different type of lost motion assembly better all round head

Post by **Thebusofwoe** » Sat Jun 06, 2015 4:37 pm

Ok thanks.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Mon Jun 08, 2015 8:15 am

P5P better than a PDE head?

Post by **Merlin** » Mon Jun 08, 2015 9:12 am

There will be no difference apart from the casting for the ATR PDE intake manifold. Both heads are from red top 11:1 comp engines.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Mon Jun 08, 2015 10:48 am

Merlin wrote:There will be no difference apart from the casting for the ATR PDE intake manifold

So do I take this to mean that if you're going with an ATR (or skunk 2) manifold, the PDE head would be better than a P5P?
(unless you're up for manually attacking the ports on a P5P head to match, of course)

Post by **Merlin** » Mon Jun 08, 2015 11:09 am

It makes no real difference. The hassle of changing over to the PDE head is much more than it is to grind off part of the flange on the ATR IM. Plus you don't really need to grind of that material anyway as you can use a Hondata IM gasket that spaces it out more.

As previously said the P5m seems to come on the S-SPEC only, all other preludes use the P13 head. Only its internal change depending on what engine it is from.