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P5 heads
#436695
08/13/09 01:25 PM
08/13/09 01:25 PM
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Joined: Feb 2005
Posts: 699
Manassas, VA USA
Scamp451
OP
mopar
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OP
mopar
Joined: Feb 2005
Posts: 699
Manassas, VA USA
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As I mingle amongst the small block community, I am constantly learning something new which also raises more questions. One question that pops into my head once in a while that I always forget to ask about in conversation is about the P5 heads. I understand they succeeded the W8's for the PS trucks. After that did Mopar just kill that engine program altogether? Curious as to why. Looks like a pretty mean top end. I know if one car that has one on an 4 cyl. in NHRA, and I guess maybe some dirt/circle 4 cyl. motors still run them, but not exactly sure. I see the P7's for sale quite frequently, but never the P5's on any drag cars, or for sale. 
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Re: P5 heads
[Re: Scamp451]
#436696
08/13/09 07:12 PM
08/13/09 07:12 PM
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Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
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From what I understand Mopar stopped casting them for a while, and they were only run on a specific R4 which Mopar stopped running. There are racers out there using them in Comp and Super Stock, including Pro Stock here in Australia. As the supply of these heads has become an issue, I know that the Australian Pro Stock team has had to resort to having the heads cast here in Australia. The R4 blocks are still an issue, sadly producing an engine block is a time consuming and costly exercise, so in reality the demand is not there to produce enough R4 style blocks and recover your money.
AL....
Alan Jones
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Re: P5 heads
[Re: S/ST 3040]
#436701
08/14/09 12:09 AM
08/14/09 12:09 AM
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Joined: Oct 2004
Posts: 3,354
ohio
HEMIDARTS
master
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master
Joined: Oct 2004
Posts: 3,354
ohio
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Quote:
Who knows? 
Probably because, NHRA axed the Pro Stock Truck class. 
I loved that class. It was and still is my all time favorite!!!
    
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Re: P5 heads
[Re: HEMIDARTS]
#436702
08/14/09 12:31 AM
08/14/09 12:31 AM
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Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
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Tom Mettler still runs a PST in Comp Eliminator, he won at Seattle not too long ago. That looks like his car in the pic Vic?
AL....
Alan Jones
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Re: P5 heads
[Re: S/ST 3040]
#436704
08/14/09 07:18 AM
08/14/09 07:18 AM
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Joined: Feb 2005
Posts: 699
Manassas, VA USA
Scamp451
OP
mopar
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OP
mopar
Joined: Feb 2005
Posts: 699
Manassas, VA USA
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Indeed they are wicked! What's the limitation on the R4 with cubic inches, the bore, cam height location, or something else? It's ok with me though, I love the sound of a 358" motor hitting the high notes down the track.  I guess the R4 the only block these heads will bolt to as LA360 mentioned. I am with you HEMIDARTS, I loved those PST's, it was different and fun. I saw somewhere that Aldermnan's old truck (or one of them) now has a Diesel motor.
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Re: P5 heads
[Re: LA360]
#436706
08/14/09 08:19 AM
08/14/09 08:19 AM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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I have more pictures of the P5 in Mettler's Dakota on home computer, but I am working out of town.
the pic above was taken at Mopars at the strip...
they ran quick 16...
they have quite the maintenance routine between rounds...
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: P5 heads
[Re: 70AARcuda]
#436707
08/14/09 09:34 AM
08/14/09 09:34 AM
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Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
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I think from memory the guy running one down here runs it at 399 cubes. The stroke is in the 3.6" range with the bores maxed out at around 4.22"-4.25"
They are very trick, one day I'll own a pair, lol
AL....
Alan Jones
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Re: P5 heads
[Re: Scamp451]
#436708
08/14/09 09:42 AM
08/14/09 09:42 AM
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Joined: Oct 2004
Posts: 3,354
ohio
HEMIDARTS
master
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master
Joined: Oct 2004
Posts: 3,354
ohio
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Quote:
Indeed they are wicked!
What's the limitation on the R4 with cubic inches, the bore, cam height location, or something else? It's ok with me though, I love the sound of a 358" motor hitting the high notes down the track. I guess the R4 the only block these heads will bolt to as LA360 mentioned. I am with you HEMIDARTS, I loved those PST's, it was different and fun. I saw somewhere that Aldermnan's old truck (or one of them) now has a Diesel motor.
A diesel huh? that is wild!!
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Re: P5 heads
[Re: Scamp451]
#436711
08/14/09 10:28 AM
08/14/09 10:28 AM
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Joined: Dec 2008
Posts: 11
Dyno
JSL
member
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member
Joined: Dec 2008
Posts: 11
Dyno
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Re: P5 heads
[Re: Diablo]
#436717
08/14/09 01:10 PM
08/14/09 01:10 PM
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Joined: Feb 2005
Posts: 699
Manassas, VA USA
Scamp451
OP
mopar
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OP
mopar
Joined: Feb 2005
Posts: 699
Manassas, VA USA
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Quote:
So what do they flow??? How big of an intake valve is in them???
Good question. As I learn a little more about cylinder heads, I would be curious to see what the runner looks like, the P7's look to be about 2-3 feet long! 
P5- 10° intake, 2° exhaust valve angles, and use a 5/16" stem based on the literature I found.
I had read or heard somewhere that they were trying to run a Hemi head when they were getting back in NASCAR, and NASCAR not only said NO but H*** NO! Perhaps that is how the P7 was developed? I know there are some on this board that know alot more about it than me.
This is the only stock photo I could find of the P5's.
"Starting" with a 8.600" deck height, the rod must be the length of a 289 Ford or something, even with a 3.150" stoke? I guess they were bread to sing, rather than grunt.
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Re: P5 heads
[Re: JSL]
#436722
08/19/09 10:38 AM
08/19/09 10:38 AM
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Joined: Feb 2005
Posts: 699
Manassas, VA USA
Scamp451
OP
mopar
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OP
mopar
Joined: Feb 2005
Posts: 699
Manassas, VA USA
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Quote:
There were 2 versions of the R-4 block........one for the P-5
head (48º/59º tappet) and one for the wedge. (straight 48º)
Gilberto posted the 4 cylinder block that used a single P-5 HEMI
head. There was a Comp Eliminator @ INDY several years ago
that ran that......but, assume you meant a V-8 block.
Is this the car?
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Re: P5 heads
[Re: HEMIDARTS]
#436726
10/10/10 12:46 PM
10/10/10 12:46 PM
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Joined: Feb 2009
Posts: 1,019
Finland
mafo
super stock
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super stock
Joined: Feb 2009
Posts: 1,019
Finland
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interesting topic... I was thinking about a r3 block without lifter holes then you can make it fit and get those cubes however many of the p5 castings were crap, I was offered to buy 2 pairs with intakes and hardware for a very god price but the seller advised against me buying !!, because of water leaks and other problems
-65 Valiant,420", all motor,2700#, dot tires, 8,42 @ 160,2
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Re: P5 heads
[Re: Scamp451]
#436729
10/11/10 07:05 PM
10/11/10 07:05 PM
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Joined: Sep 2009
Posts: 1,805
ky hills
thehemikid
top fuel
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top fuel
Joined: Sep 2009
Posts: 1,805
ky hills
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Quote:
As I mingle amongst the small block community, I am constantly learning something new which also raises more questions. One question that pops into my head once in a while that I always forget to ask about in conversation is about the P5 heads.
I understand they succeeded the W8's for the PS trucks. After that did Mopar just kill that engine program altogether? Curious as to why. Looks like a pretty mean top end. I know if one car that has one on an 4 cyl. in NHRA, and I guess maybe some dirt/circle 4 cyl. motors still run them, but not exactly sure.
I see the P7's for sale quite frequently, but never the P5's on any drag cars, or for sale.
...This one was for sale here on Moparts & Race Junk in Feb 06 till it fell off the page with no responses. It was the 1st Gen P5 before the plug relocation (P5 HEMI). 
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Re: P5 heads
[Re: DaKuda]
#436732
10/12/10 03:52 AM
10/12/10 03:52 AM
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Joined: Sep 2009
Posts: 1,805
ky hills
thehemikid
top fuel
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top fuel
Joined: Sep 2009
Posts: 1,805
ky hills
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...They're closer to a polysphere, & similar to the Fueling. ...You can see the open area's where the next design (Hemi) spark plug's were relocated. This was an X-David Nickens P5 358ci.
Last edited by thehemikid; 10/12/10 10:08 PM.
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Re: P5 heads
[Re: thehemikid]
#436733
10/12/10 10:03 PM
10/12/10 10:03 PM
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Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
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The P5 heads shown were considered to be the "Wedge" heads, when the plugs went through the Rocker covers, they started with the Hemi marketing. At the end of the day they are just a Splayed valve wedge head, like the Hemi 99 heads.
Alan Jones
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Re: P5 heads
[Re: LA360]
#436734
10/13/10 12:31 AM
10/13/10 12:31 AM
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Joined: Oct 2008
Posts: 1,015
Down South
DaKuda
super stock
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super stock
Joined: Oct 2008
Posts: 1,015
Down South
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Quote:
The P5 heads shown were considered to be the "Wedge" heads, when the plugs went through the Rocker covers, they started with the Hemi marketing. At the end of the day they are just a Splayed valve wedge head, like the Hemi 99 heads.
 Nothing HEMI about what I see except the word on the valve covers.
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Re: P5 heads
[Re: DaKuda]
#436735
10/13/10 08:22 PM
10/13/10 08:22 PM
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Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
S/ST 3040
master
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master
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
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Quote:
Quote:
The P5 heads shown were considered to be the "Wedge" heads, when the plugs went through the Rocker covers, they started with the Hemi marketing. At the end of the day they are just a Splayed valve wedge head, like the Hemi 99 heads.
Nothing HEMI about what I see except the word on the valve covers.
It's a HEMI, it's not a HEMI. Just a logo, marketing ploy..........It's still probably
the baddest SB Mopar head ever made, to date. I'd use a set.
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Re: P5 heads
[Re: S/ST 3040]
#436736
11/17/10 01:41 PM
11/17/10 01:41 PM
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Joined: Sep 2003
Posts: 1,138
San Angelo, Texas
W8n2DustU
super stock
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super stock
Joined: Sep 2003
Posts: 1,138
San Angelo, Texas
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Anyone know where you couldfind a complete set? If it bolts to an A4 block, will to of them bolt on my A8 block?
2010 Toxic Orange Challenger built by B and B Racecars! All aluminum R4/P5 engine, Proformance TH400 (3 speed) tranny, full Reid case, nodular 9" rearend, full Dragpak suspension, Protorque custom converter, BS3, PTE 85mm turbo, fire core wires, carbon doors, carbon front clip, and a whole lot more!
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Nice Vic!
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