Re: Cast iron R4 blocks
[Re: Oyvind Mopar]
#2064642
04/30/16 12:36 PM
04/30/16 12:36 PM
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Joined: Nov 2004
Posts: 4,330 Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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First off the description on R4 block is wrong. P7 heads are a lil different bolt pattern. P9 heads have a 4.500" bore spacing.
You guys get way to caught up in numbers. You have these numbers from builds you read about memorized as if it is the gospel. Displacement numbers. I have ran from 421-468 cid with W8 heads. I love a big bore. 4.185" is small and has its limits. Current R5p7 is 4.182". Just nature of the aluminum eei block. With R3 I'd start at 4.200" 4.250" if you aint scared. Stroke simply moves the rpm power range. I like stroke. It feels better and you can shift lower. Displacement by stroke is a lot the same way except with power adders.
Long story short you dont have to build 440 cid. It just a number
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Cast iron R4 blocks
[Re: Leon441]
#2066161
05/02/16 09:35 PM
05/02/16 09:35 PM
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Joined: Jun 2005
Posts: 2,776 Ontario Canada
MattW
master
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master
Joined: Jun 2005
Posts: 2,776
Ontario Canada
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First off the description on R4 block is wrong. P7 heads are a lil different bolt pattern. P9 heads have a 4.500" bore spacing.
You guys get way to caught up in numbers. You have these numbers from builds you read about memorized as if it is the gospel. Displacement numbers. I have ran from 421-468 cid with W8 heads. I love a big bore. 4.185" is small and has its limits. Current R5p7 is 4.182". Just nature of the aluminum eei block. With R3 I'd start at 4.200" 4.250" if you aint scared. Stroke simply moves the rpm power range. I like stroke. It feels better and you can shift lower. Displacement by stroke is a lot the same way except with power adders.
Long story short you dont have to build 440 cid. It just a number The only reason I mention big Cid was to lower the rpm on the P5 heads. I think that these heads were designed for 10000 rpm on a 358 cid. IMO the bigger cid would lower the rpm and power ban.
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Re: Cast iron R4 blocks
[Re: Leigh]
#2087531
06/07/16 02:10 AM
06/07/16 02:10 AM
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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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Will the P9 heads bolt directly onto an A8/R4 block ? Or should I say could I remove my P5 heads and bolt on the P9 heads? What are the valve angles and flow numbers of the P9? There's not a lot of info on them.
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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Re: Cast iron R4 blocks
[Re: W8n2DustU]
#2087964
06/07/16 09:16 PM
06/07/16 09:16 PM
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Joined: Jan 2003
Posts: 6,163 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,163
Melbourne , Australia
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Will the P9 heads bolt directly onto an A8/R4 block ? Or should I say could I remove my P5 heads and bolt on the P9 heads? What are the valve angles and flow numbers of the P9? There's not a lot of info on them. Different bore spacing Marty, plus the bolt pattern is most likely different $1995 blocks just isn't going to happen, the return on investment just isn't going to be there. It's all good and well saying they will sell, you're not the one kicking in the $200K and 1-2 years doing it. If you're that confident, mortgage your house and do it.
Alan Jones
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Re: Cast iron R4 blocks
[Re: Leigh]
#2087984
06/07/16 09:58 PM
06/07/16 09:58 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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So the new R4 blocks and old R4 blocks are different? I was assuming they were the same just a different deck height. I was wanting to bolt on a good cast P5 head or try the P9's. I can't run a blower and billet heads in my class. Thanks for the info.
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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