P5? You've got to find them first!

The P7 stuff will make good power, and there's plenty of stuff out there. When you've got a new block coming out, it would make sense to play around with some combinations for prospective clients.

AL....

If Rick wanted P5's, he could get them pretty easily.

Due to the lack of the "other" blocks I just got an R5 for my R5/P7 build.

How many different p-7 intakes are out there....Ive only one...sorta looks like a mini pred intake.

A couple of points to consider.

I have heard that the W9 heads are thin on top and agressive profiles & high RPMS will crack the rocker supports.

There is a 80lb gain with the R5 block.

Hope this helps

Actually there were quite a few intake manifolds made for the R5/P7 combination.
I have a few of each here, some of what I have are no longer NASCAR legal, I am not sure why but that is a fact so if you need pictures or info I will try to help.
We have built and dynoed about every combination of parts that are available for the R5-P7 (most in roller cam form) and to be honest I think the port work means more than the part number.
Certainly there are a few manifolds that have much larger volume than others, but as changes were made and time went on the runners became shorter. No doubt the intent was to move peak power up higher in the RPM range.
I have one motor here that makes peak at 9300, not that long ago this thing would have been a decent Comp Eliminator motor, think about it this way, it has a cast manifold, a circle track style cam, 12.5 Compression and was dynoed with a nothing carb.It makes almost 2.4 per cube with break in oil. A few modest changes and it can still be very good.
Actually we are having a few sheet manifolds made for these things, if you think you want to go down that road let us know.

Rick

There are quite a few P7 intakes:

2819:

:

....

And another,

Thanks for the intake pics and info, I should be good with mine then since im not trying to squeeze max power.

Although do know one of the intakes makes a few more approx 20 #-s torque at a lower rpm but takes it off the top.

Thanks again.

Wow this is an old thread.
I'm planning to do a P7 one day. I'm just now getting my W9s on my X block now. On the heads cracking I could see an issue with max porting and the older rocker mount that doesn't have the extra bolt on the ends.
In the classes around hear that my car fits in like ORSCA Modified street, canted valve heads require +100#., and I believe the Realstreet class in Floridia they aren't allowed.

The one thing I'd like to make for my W-9s is a set
of studs for the rocker hold downs that stays in the
head, I've cut the bolts in the intake port for flow
but everytime I take the rockers off I have to make
sure I put the right bolt in the right hole so it
matches up in the port. With the studs I could leave
them in

I turned my 540 to 8600 on every pass.

---

I'd go higher if it made power, but mine peaks at
8100 rpm and I cross the line at 8200 so thats all
it takes for me. My new 514 should be a 8500 to 9000 rpm
engine

When I spoke to CFE about this same topic here is what they told me.....

A W8 is the better head for all out N/A apps, they did not want anything to do with a W9 casting.

A W8 head will outperform a P7 head IF THE P7 does not have a sheetmetal setup....if the P7 has a sheetmetal, then it will dominate..

They also told me that they were confident that their W8 head would support 1000HP out of 420" and still do it with 15* valve angle

For the coin, the P7 stuff that is around is hard to beat for what you pay. I know first hand what you will spend with CFE for a top end, that money will basically buy you a fresh R5/P7 engine.
W9 heads were designed with a very specific purpose (Dirt Oval Track), where as the W8 had to where several caps figuratively speaking.
If I was looking to build a small block that made 800+ HP I wouldn't look at anything but a P7 head these days.
JMO anyway
AL....

with what i have seen with my buddies extremely tame p7 motor thus far, i think the p7 head is going to have way more potential than a w9 head. just my opinion.

I think with that new block, longer stroke it will allow, it will be hard to keep an optimized combo out of the 8's just on motor even at the weight you are talking. He has already been almost 141 mph with a tiny cam, 12 to 1 compression, and zero tuning at 358 inches using the belt to drive the water pump . Lots of upside to the p7 head with that new block.His convertor was behind another combo nothing like the p7 motor he has, so there is a ton of et in getting that sorted out as well.

Jeez Don, are you board? Bringing back posts from the dead 6 months later...lol...