Re: W9 or P7 ?
[Re: Leon441]
#50912
12/31/07 08:24 PM
12/31/07 08:24 PM
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Joined: Jan 2003
Posts: 6,142 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,142
Melbourne , Australia
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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....
Alan Jones
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Re: W9 or P7 ?
[Re: LA360]
#50915
01/16/09 10:25 AM
01/16/09 10:25 AM
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Joined: Feb 2004
Posts: 1,093 Long Beach, CA
Mike Swann
super stock
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super stock
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
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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
8.30's @3400 lbs
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Re: W9 or P7 ?
[Re: Mike Swann]
#50916
01/16/09 11:03 AM
01/16/09 11:03 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
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
I dont know what your refering to thin but the valve cover area is thinner(so called light weight), on the rocker area, if you use the good rockers, like TD or Jesel you wont have a problem(at least I havent) but I have only been turning mine to 8200 rpm but have been as high as 8600rpm and I dont have any problems on the rocker mounts. I heard from the race group at work that they did have pedistal problems cracking when they first brought out the W-9 but havent heard of it since then
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Re: W9 or P7 ?
[Re: Domino1609]
#50918
01/16/09 11:20 AM
01/16/09 11:20 AM
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Joined: Oct 2004
Posts: 489 mid Ga.
W5Dart378
OP
mopar
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OP
mopar
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Posts: 489
mid Ga.
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There are quite a few P7 intakes:
69 340 swinger streetcar 8.13 1/8th w/1.90 60ft w/ 3.55s
69 422W9 Dart stock suspension,5.27 on 275/60s,single bar plate
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Re: W9 or P7 ?
[Re: W5Dart378]
#50924
01/16/09 11:39 AM
01/16/09 11:39 AM
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Joined: Oct 2004
Posts: 489 mid Ga.
W5Dart378
OP
mopar
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mopar
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mid Ga.
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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.
Last edited by W5Dart378; 01/16/09 11:43 AM.
69 340 swinger streetcar 8.13 1/8th w/1.90 60ft w/ 3.55s
69 422W9 Dart stock suspension,5.27 on 275/60s,single bar plate
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Re: W9 or P7 ?
[Re: W5Dart378]
#50925
01/16/09 11:56 AM
01/16/09 11:56 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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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
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Re: W9 or P7 ?
[Re: MR_P_BODY]
#50928
01/16/09 12:37 PM
01/16/09 12:37 PM
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Joined: Mar 2008
Posts: 573 PA
68CudaB1
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mopar
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PA
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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
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Re: W9 or P7 ?
[Re: 68CudaB1]
#50929
01/31/09 06:28 PM
01/31/09 06:28 PM
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Joined: Jan 2003
Posts: 6,142 Melbourne , Australia
LA360
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master
Joined: Jan 2003
Posts: 6,142
Melbourne , Australia
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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....
Alan Jones
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Re: W9 or P7 ?
[Re: W5Dart378]
#50930
07/22/09 02:33 PM
07/22/09 02:33 PM
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Joined: Jan 2003
Posts: 11,712 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,712
Portage,michigan
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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.
Last edited by B3422W5; 07/22/09 02:35 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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