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Kirkham Motorsports

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Old 06-13-2012, 12:15 PM
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What is the main reason for the choice of SBFs for Superformance and Backdraft?
I believe SBF's are the overwhelming choice for BDR's and SPF's, because, and I'll probably get hammered here, they're less expensive choices than a CSX, KMP and ERA, plus maybe, folks who choose a BDR and SPF are slightly less concerned about adherence to the original. FE's are heavier, less so with aluminum blocks and heads, and more expensive to build.
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Old 06-13-2012, 12:17 PM
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Originally Posted by RodKnock View Post
I believe SBF's are the overwhelming choice for BDR's and SPF's, because, and I'll probably get hammered here, they're less expensive choices than a CSX, KMP and ERA, plus maybe, folks who choose a BDR and SPF are slightly less concerned about adherence to the original. FE's are heavier, less so with aluminum blocks and heads, and more expensive to build.
Ok, makes sense.. Sorry to have asked you to stick your neck out like that but I figured with your post count you will survive intact!
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Old 06-13-2012, 12:20 PM
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Originally Posted by RodKnock View Post
I believe SBF's are the overwhelming choice for BDR's and SPF's, because, and I'll probably get hammered here, they're less expensive choices than a CSX, KMP and ERA, plus maybe, folks who choose a BDR and SPF are slightly less concerned about adherence to the original. FE's are heavier, less so with aluminum blocks and heads, and more expensive to build.
I never understood why the FEs are less popular in the SPFs. But from the BDR perspective meeting a predefined version of a "Cobra" is not the reason a customer selects BDR, so from there on out it's about optimizing the car to their tastes, use, and budget.

One of my favorite BDRs to drive to date has a Roush 451 in it. I get to drive it every couple years ... great engine and not a drip or drop of oil to this day.
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Old 06-13-2012, 01:04 PM
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I never understood why the FEs are less popular in the SPFs. But from the BDR perspective meeting a predefined version of a "Cobra" is not the reason a customer selects BDR, so from there on out it's about optimizing the car to their tastes, use, and budget.
Obviously having a business relationship with engine builder such as Roush may contribute to the reason why most SPF's and BDR's have SBF's. For whatever reason, there are alot of Roush SBF's in BDR's and SPF's. The Roush BBF's are about the same price as BDR or SPF roller, so that could be just one reason for the lack of BBF's in BDR's and SPF's.

Last edited by RodKnock; 06-13-2012 at 01:10 PM.. Reason: tense correction
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Old 06-13-2012, 01:08 PM
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Originally Posted by RodKnock View Post
Obviously having a business relationship with engine builder such as Roush may have contribute to the reason why most SPF's and BDR's have SBF's. For whatever reason, there are alot of Roush SBF's in BDR's and SPF's. The Roush BBF's are about the same price as BDR or SPF roller, so that could be just one reason for the lack of BBF's in BDR's and SPF's.
It may have a slight influence but not much anymore. Very few Roush engines going out the door the last 2+ years. Adding to some of the reluctance on the BDR with FE builds is the headers are generally not stocked etc.

There's also a lot of SPFs with Ford Racing 460s ... that would be a tip to the cost factor.
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Old 06-13-2012, 01:11 PM
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Very few Roush engines going out the door the last 2+ years.
I wonder why?
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Old 06-13-2012, 01:58 PM
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I wonder why?
Options... a few years ago you had 2 or 3 choices for small block 427s. Now with the availability of the DART SHP blocks the prices have come down and other builders in the mix. Not to mention Ford Racings 427.
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Old 06-13-2012, 02:47 PM
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Todays small blocks will give you tremendous power and damn near that BB roar and rumble for far less $$$ but in MHO just don't look quite right in a 427 engine bay. But thats me.

The FE 427SO is the only "correct" motor for the 427 Cobra except for the 428 Police Interceptor that found it's way into some street cars for a short run in production. These two motors are only indispensible motors for your "Cobra" if you are a die hard in "correctness" and aesthetics like yours truly. These motors are, especially the SO becoming very rare and very expensiive. I think they will definitely increase the value of any build but you will pay for it. A dead nuts NOS 427SO built right today, soup to nuts will be every bit of $35,000.00.

A nice 428 CJ or 390FE will look and sound the part and provide as much if not better torque then the 427SO for much less $$$$.

It sounds like the 428CJ or 390FE are the way to go for you from what I sense from you posts. You can also do a 428 PI for much less then an SO and still be "Cobra correct".
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