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Old 05-31-2010, 02:17 AM   #1
ten5nova
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Default Ever built a 427 BBC?

Just curious to know what some of your experiences have been with 427's. I'm really not planning to build one any time soon, but I wouldn't totally rule it out. I'm curious to know how common steel cranks were in them, how much power said crank would take, what kind of RPM potential do they have, what cylinder head would be best for a relatively high RPM application, etc.... The only way I would build one is to put a 300 to 320 or so CC head on one, spray it, and twist the hell out of it. Has anyone tired this, and what was the outcome? I appreciate all input on this inquiry. Thanks!
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Old 05-31-2010, 03:38 AM   #2
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Default Re: Ever built a 427 BBC?

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Old 05-31-2010, 04:44 AM   #3
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Default Re: Ever built a 427 BBC?

No real reasons to only go with a 427" BBC nowadays, even for a high-RPM application (I'm guessin' you mean appx. 7000-8500rpm?) That crank is probably a casting number '6223, very common to '66+ 396cid & 427cid MK IV engines. A reeeaaaally nice std./std. one on Ebay will bring $250, not much more. You'll be into the rotating assembly for the same price, whether you go with 427" or 496", as you'd want a nice, lightweight set of pistons for either and also a strong rod (any length is gonna' be the same $$). Even if the crank ended up being $200 more, for the extra 69cid, it would be a waste to do the smaller engine just because you "already had the crank". Shell out the $3-400 for a decent 5140,4130 or 4340 crank, then sell that 3.76" stroke stocker to some resto' guy and make back $200 of it. Hope my $0.02 is helpful info' to ya'. Also, I'd go with the AFR 315CNC's, pt. # 2000 on either build, tough to beat. Good luck!


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Old 05-31-2010, 09:12 AM   #4
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Default Re: Ever built a 427 BBC?

I have had my 427 (3.76x4.310=440) for 30 years just because thatís what I started with and its still going! Mine uses GM #1236390 small port aluminum heads that flowed 319int 227exh @ .700 which is good for my 6800 RPM solid flat tappet. As with any higher RPM engine, the valve train weight is very important. One advantage that I see for the 3.76 stroke is that on a marginal track you could have an advantage over the longer arm crank from a traction point of view with a smaller tire car. In a future build for me I am considering a 3.76 x 4.50 = 478 build if my heads and intake will be able to handle the additional cubes with some porting if not I will step up to a conventional 540 and be done with it.

If you are building from scratch the cost of components for a conventional BBC build are going to be in the same ball park wither itís a 3.76 stroke or a 4.25 and more cubes = more fun.
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Old 05-31-2010, 02:42 PM   #5
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Default Re: Ever built a 427 BBC?

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Originally Posted by Swiftshifter View Post
No real reasons to only go with a 427" BBC nowadays, even for a high-RPM application (I'm guessin' you mean appx. 7000-8500rpm?) That crank is probably a casting number '6223, very common to '66+ 396cid & 427cid MK IV engines. A reeeaaaally nice std./std. one on Ebay will bring $250, not much more. You'll be into the rotating assembly for the same price, whether you go with 427" or 496", as you'd want a nice, lightweight set of pistons for either and also a strong rod (any length is gonna' be the same $$). Even if the crank ended up being $200 more, for the extra 69cid, it would be a waste to do the smaller engine just because you "already had the crank". Shell out the $3-400 for a decent 5140,4130 or 4340 crank, then sell that 3.76" stroke stocker to some resto' guy and make back $200 of it. Hope my $0.02 is helpful info' to ya'. Also, I'd go with the AFR 315CNC's, pt. # 2000 on either build, tough to beat. Good luck!


---==Temio Williams
Yuba City, CA
Thanks for the input guys!! The only reason I'm even considering a build like this is just to do it on the cheap. If I could find one with a stock steel crank, I'd put a good rod and piston in it, a good cylinder head, and run it. It would be a street engine, not an all out race engine. A friend's family owns a auto salvage yard, and has just about any engine laying around that you would ever want to build, and I get great deals from them. Lately I've had a tremendous interest to try different engine combos, just to see what they would do. The 427 BB just popped into my head last night. I only know one guy that has ever ran one, it was pump gas deal with Merlin iron heads, made 500 on the motor. I know I could do way better than that with a good head, and some descent RPM, I'm thinking around 7000-7500. If I ever built the thing it would probably go on the dyno, then get sold locally. This is why I'm so curious......
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Old 05-31-2010, 02:45 PM   #6
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Default Re: Ever built a 427 BBC?

i have 1 in my car now but the only reason i built it was bcs the parts were already there and i blew my 406SBC.But it keeps up with the big boys on juice lol.
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Old 05-31-2010, 02:50 PM   #7
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Default Re: Ever built a 427 BBC?

No reason to build one, a 4.00 stroke 454 makes alot more sense.
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Old 05-31-2010, 03:20 PM   #8
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Default Re: Ever built a 427 BBC?

Back in the 60s you could go to JackShaw Pontiac in Cleveland and buy a brand new L88 427 long block for about 2 grand. 3/8 bolt dot rods, steel crank, square port closed chamber iron heads, forged pistons and a decent solid lifter flat tappet cam. You could put it in a 65 Impala SS convertible with a four speed, 2 inch headers and a 4.88 posi and drive it to Thompson, swap on a 9 inch slick, run 12.80s ets and drive home. Then in the 70s they started selling the LS7 454 long blocks which were faster. They had the 7/16 bolt dot rods, steel crank, forged pistons, and the open chamber square port iron heads. I was not satisfied with the GM cams in them so I always swapped to a better cam myself. They cost about 3 grand.
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Old 05-31-2010, 04:42 PM   #9
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Default Re: Ever built a 427 BBC?

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No reason to build one, a 4.00 stroke 454 makes alot more sense.
I understand what you are saying, but I would build one before I would haul it to the scrap yard!! I doubt anyone ever thought a 400 M Ford would ever be a good option, but look how popular they are all of a sudden. All I'm saying is if I could find one cheap, that might have a steel crank, put some descent parts in it, and run it on the dyno just for what it is. This engine would probably get sold, it would never go in any of my cars. So again I ask, how common were steel cranks in these engines, and would they handle 7000 RPM? I'm not looking to make 1000 horsepower, I just want to try something different to satisfy my curiousity, have some fun, and maybe make a few dollars when I sell it. Thats all, not looking for the best way to build a max effort 427.......
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Old 05-31-2010, 06:56 PM   #10
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Default Re: Ever built a 427 BBC?

About 10 years ago i had a 427 with aluminum rods, GM sleel crank and Brodix BB2 heads that would scream to 8000rpm no problem. It ran 9.70's in a tube chassis 68 Camaro shifting at 7600rpm. I'm guessing it made 650 to 680hp. If you go with a GM crank check it for cracks regularly. I've seen a bunch with cracks. In the long run your better off building something bigger with new parts.
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Old 05-31-2010, 08:11 PM   #11
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Default Re: Ever built a 427 BBC?

I have seen GM Steel cranks old up to 8500 rpms, the crank is not the weak point.
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Old 05-31-2010, 09:00 PM   #12
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Default Re: Ever built a 427 BBC?

Quote:
Originally Posted by Outlaw Bill View Post
I have seen GM Steel cranks old up to 8500 rpms, the crank is not the weak point.
This is what I was looking to know. I would definatly run a GOOD rod and piston, but I've never been afraid of a good GM crank. I've seen some GM steel cranks take some serious power on the dyno, BB and SB. The only real reason I would try it is just to see what it would do, and I know I can sell it locally, thats all.
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Old 05-31-2010, 09:30 PM   #13
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Default Re: Ever built a 427 BBC?

Our street car runs 13.0x @ lewistown with a 427 9.5 comp big valve stock oval ports ect at 3600lbs, I know not fast. With around 11 to 1 comp, good heads and a solid roller I dont see why you couldnt be in the 11's @ 6000' DA on pump gas.
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Old 05-31-2010, 09:40 PM   #14
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Default Re: Ever built a 427 BBC?

I have had 2 427s,back in the day......they sucked high revving low torque engines,my 454 pump gas motor was
faster than 2 high CR 427s
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Old 05-31-2010, 10:15 PM   #15
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Default Re: Ever built a 427 BBC?

have an oliver steel rod 427 with gm steel crank and brodix bb-2 heads goes 9.90s all day long,shift at 8000 goes through at 8100 in a 3300lb all steel camaro.nothing trick or lightweight in the engine at all,everything is off the shelf parts.
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