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R4/P5 HEMI
#327054
05/24/09 12:19 PM
05/24/09 12:19 PM
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Anonymous
OP
Unregistered
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Anonymous
OP
Unregistered
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I have seen mention of the P5 HEMI mounted on the R4 block. Unfortunately, trying to find much more than parts listings is a bit of challenge.
What do people know about this combo?
Going to be taking a new Challenger and building a drag car and am thinking of either a 7 liter R4/P5 or R5/P7 set up
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Re: R4/P5 HEMI
#327055
05/24/09 04:45 PM
05/24/09 04:45 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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I don't think you can get 430" in a 9" R-4 block. I can't help but, Patterson, CFE and Jeff @ Modern Cylinder Head would be places to start asking questions. Member sixpackbee might be able to point you in the right direction too.  
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Re: R4/P5 HEMI
#327056
05/24/09 04:49 PM
05/24/09 04:49 PM
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Joined: Sep 2008
Posts: 2,840
Flint, Michigan
B1Fish540
master
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master
Joined: Sep 2008
Posts: 2,840
Flint, Michigan
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Quote:
I have seen mention of the P5 HEMI mounted on the R4 block. Unfortunately, trying to find much more than parts listings is a bit of challenge.
What do people know about this combo?
Going to be taking a new Challenger and building a drag car and am thinking of either a 7 liter R4/P5 or R5/P7 set up
I like the idea! I have not heard of this combo, but like mentioned patterson may have the info. hope it all comes together for you..that would be sooo bad azz!! 
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Re: R4/P5 HEMI
[Re: S/ST 3040]
#327057
05/24/09 04:53 PM
05/24/09 04:53 PM
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Joined: Jan 2003
Posts: 6,195
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,195
Melbourne , Australia
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The heads are in limited supply as far as new casting go, unless Mopar has started producing them again. The R4 blocks have been on back order for the last 5 years or so. As already has been stated, you will struggle to get more than 400 cubes using a R4 block, although a XR block could be ordered without lifter bores and blank decks.
CFE, Slawko or MBE would be where I would start looking into cylinder heads. Intakes are sheet metal only, I have not yet seen a cast intake for one.
If building from new parts, you'll have over $60K in one of these combos. They have the potential to make over 1000hp N/A, but it comes at a price.
Jim Scortino has run one of these engines I believe, maybe he will chime in
AL....
Alan Jones
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Re: R4/P5 HEMI
[Re: LA360]
#327058
05/24/09 06:34 PM
05/24/09 06:34 PM
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Joined: Apr 2007
Posts: 2,030
Trumbull,CT.
jim sciortino
top fuel
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top fuel
Joined: Apr 2007
Posts: 2,030
Trumbull,CT.
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Quote:
The heads are in limited supply as far as new casting go, unless Mopar has started producing them again. The R4 blocks have been on back order for the last 5 years or so. As already has been stated, you will struggle to get more than 400 cubes using a R4 block, although a XR block could be ordered without lifter bores and blank decks.
CFE, Slawko or MBE would be where I would start looking into cylinder heads. Intakes are sheet metal only, I have not yet seen a cast intake for one.
If building from new parts, you'll have over $60K in one of these combos. They have the potential to make over 1000hp N/A, but it comes at a price.
Jim Scortino has run one of these engines I believe, maybe he will chime in
AL....
We currently have a PSI screw blown HEMI and an R3-W8, but are looking into doing a P-5 with a tall, blank XR block and MBE heads/intake.
We havn't run a P-5 head, but it looks like it would be an interesting combo.
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