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Old 02-28-2009, 10:17 AM   #1
ITSNOTFASTENOUGH
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Default What are some good 427 BBC combos with stock iron heads.

My dad has a 427 around 12:1 steel crank, Eagle rods, forged TRW pistons and rect port closed chamber heads with minor clean up work with 2.25 1.88 valves, Team G 1050 dominator .652 .652 Comp street roller 308 adv 264 @.050, 400 turbo 5500 converter Dana 60 5.13 gears weighs 3100 has ran a best of 6.75 at about 104. I know thats pretty good for his combo but we are curious about other combos and how much power they made and what they ran.
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Old 02-28-2009, 11:27 PM   #2
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Default Re: What are some good 427 BBC combos with stock iron heads.

Im glad you asked because Ive been meaning to start a thread for 427 buildups too. I have in the past with no real luck either. I dont think many if any of them run 427's here. From what Ive seen so far is the 406sb guys are making more power than what Ive normaly seen with 427bb counterpart. The only two people that I know who had stomping 427's was spiro papas in the original black 69 and chuck samuel in the red 86 camaro.
Concider this a bump for the thread.
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Old 02-28-2009, 11:34 PM   #3
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Default Re: What are some good 427 BBC combos with stock iron heads.

The only thing I found in the 130+ pages of this thread is this combo.
427 +.060 13.5:1 pro335's 270/276 @.050 .714 vic jr 1095KingD
707hp @ 7800rpm

Im about to make mine into a boat anchor. The 427 doesnt seem to be worth the investment, unless its an aluminum block fed by an f2
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Old 03-01-2009, 12:18 AM   #4
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Default Re: What are some good 427 BBC combos with stock iron heads.

10SecBu/Dotracer (cant remember his call sign here but it's Todd Geisler) had a very good running destroked 427. IIRC it was a 414bbc that went 10.4-10.5 at 3500lbs or so on pump gas. That's been about 5 years or so ago. My how time fly's. Maybe he'll see this thread and chime in.
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Old 03-01-2009, 12:56 AM   #5
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Default Re: What are some good 427 BBC combos with stock iron heads.

427+60, rpm heads, 245/255 @ 0.050 112 648/648in&ex hyd roller strip dominator 550hp 513tq

433 afr 305's vicjr compcams 288ar street roller 9:1cr 850dp
596hp @ 6500rpm 520tq @ 5500rpm. It was a engine masters engine build. Not sure if I belive anything I read anylonger...

427, stock merlins , 1050 dominator, 11:1, strip dominator, compcams 288ar 2" headers, approx 430hp @ the wheels in a stick vette.

Todds was a 414 long rod, vicjr, 10:1cr XR286 billet solid roller, 781 ovals, ran a best of 10.47 @ 127mph 3580lbs if im not mistaken.
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Old 03-01-2009, 07:37 AM   #6
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Default Re: What are some good 427 BBC combos with stock iron heads.

I think Todd's motor was a stroked 396 with a 4" stroke crank for 414".

I had quite a bit of experience with 427's and I've talked to Jester about it on the chevelle site. My first 427 was a speedpro 2308 piston motor with a .628/.648 260/268 flat tappet cam. The heads were first series rect port Merlins (basically not much better than a stock rect port head). With an 850 on a strip dominator, it went 11.05 weighing in at around 3600 lbs. The second one used the same top half, with a .725/.725 roller and JE 13-1 pistons. This went 10.38 at 3400 lbs.
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Old 03-01-2009, 08:40 AM   #7
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Default Re: What are some good 427 BBC combos with stock iron heads.

Back to the magazine buildups which are very hard to believe but they built a 427 about 8-9 years ago that was about 14:1 Manley alum rods, 990 heads with minor work, Lunati .748 roller and made 740 some horsepower at 7500 and on spray made 1000. Hard to believe but some of the old super stock cars back in the day went 9s with stock head 427s
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Old 03-01-2009, 08:57 AM   #8
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Default Re: What are some good 427 BBC combos with stock iron heads.

I think for all the posted ET's it's safe to say a small cid BBC is not worth the effort since a sbc can put out the same and weighs alot less doing it. Is'nt the whole reason of going to a pig block to utilize additional cubic inch? This 427BBC is like having a 350lb nose guard that cant squat 200lbs....looks the part, just is'nt worth a damn in the real world.

Kinda like a guy asking, what's a good combination for a 305 sbc... Just cuz a guy's got it, does'nt mean it's worth vesting into.
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Old 03-01-2009, 09:13 AM   #9
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Default Re: What are some good 427 BBC combos with stock iron heads.

I don't see why you can't make good power with a 427. The stock heads are a bad move IMO. The weight alone is crazy.
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Old 03-01-2009, 09:46 AM   #10
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Default Re: What are some good 427 BBC combos with stock iron heads.

years back a good friend of mine had a 427 in a 70-chevelle,weighed about 3200-lbs had 13-1 comp,720-lift roller,around 260-in,270-ex@050,850 holley on a edelbrock intake,the one with the carb twisted a little [victor or 2r-or something],2-1/8 headers 488-gears,car ran 1020's @ 132 mph,boy that was flying for a nothing motor.
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Old 03-01-2009, 09:56 AM   #11
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Default Re: What are some good 427 BBC combos with stock iron heads.

I wouldent bother with a 427 BBC.....Having owned 2 previously
the small stroke IMO is too low on torque.....Even my old pump gas 454 was faster than my high comp 427.......
But if your dieing to try it id use oval port heads and really steep gears,be prepared to spin that thing like a small block
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Old 03-01-2009, 10:25 AM   #12
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Default Re: What are some good 427 BBC combos with stock iron heads.

I have a few good "real world" combos that are 427 motors. The first is my streetcar, pretty much all OEM GM parts and oval port heads.

First, read this:

http://www.nescaracing.com/polishsneakers.html

Now since I own the 427 in that article, and have talked to Buddman (Procar on YB.com) a few times about it, just know that there is still more in there now that the technology behind these motors have advanced since they were done. The 427 or 432 inch motor has been 10.60's @ 3500 lbs and with the converter and 10" DOT's.

Now my buddies 427 is a little more. PUMP GAS motors at have been as fast as 9.30's with some basic hot-rod upgrades. But the iron heads deal has been well into the 9's. The power aspect of the question is not a point due solely to the fact that no two dyno's are the same. My own "427" based engine went from 1278 On Steve Schmidt's dyno to 1143 on Fj Smith's dyno, but ET's were about the same, not even a tenth difference?

I myself like the idea of the 3.75 stroke, that's me. But a 10,000 RPM BBc is something that not a lot of people have, and I like to be a bit different. The 427 will do pretty much what you want, just need to get a good gameplan and talk with the engine builder about it, if using one. There is no reason that a "good effort" not just cubic dollar, 427 can't run 9.90's with just a good bunch of parts and knowledge.
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Old 03-01-2009, 02:18 PM   #13
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Default Re: What are some good 427 BBC combos with stock iron heads.

Quote:
Originally Posted by bracketchev1221 View Post
I think Todd's motor was a stroked 396 with a 4" stroke crank for 414".

I had quite a bit of experience with 427's and I've talked to Jester about it on the chevelle site. My first 427 was a speedpro 2308 piston motor with a .628/.648 260/268 flat tappet cam. The heads were first series rect port Merlins (basically not much better than a stock rect port head). With an 850 on a strip dominator, it went 11.05 weighing in at around 3600 lbs. The second one used the same top half, with a .725/.725 roller and JE 13-1 pistons. This went 10.38 at 3400 lbs.
LOL didnt mean to leave you out. Couldnt find the info until this morning, ok my morning 2pm.

Todds was a offset grid crank, 6.5" rods or was it 6.4" cnat remember.

NPS. I have referenced that artile time and time again, didnt know it was yours. I did want to ask who owned it previously but decided not to. What heads are on that engine and do you have the cam number or figures if its not to much to ask?

Yullose went 9.00 @ 149 (approx) with 433 merlin headed, 3/8" GM rods, maxed NOS bigshot plate

Now my 427 is apart again. Here are the specs to it.
427+.30 2308 trw's, Hbeam 6.135, 6223 crank, bullet solid roller 264/272 @ .050 .660/.660 110, 781's 2.19/1.88's, vicjr plumbed with a prorace fogger. What will this run? I havent got the slightest clue, but hopping atleast 9:40's on the jug.
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Old 03-01-2009, 02:30 PM   #14
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Default Re: What are some good 427 BBC combos with stock iron heads.

Quote:
Originally Posted by ITSNOTFASTENOUGH View Post
Back to the magazine buildups which are very hard to believe but they built a 427 about 8-9 years ago that was about 14:1 Manley alum rods, 990 heads with minor work, Lunati .748 roller and made 740 some horsepower at 7500 and on spray made 1000. Hard to believe but some of the old super stock cars back in the day went 9s with stock head 427s
Yes the famous article to which no one has any information about. I did call Musis shop several times, emailed them, and contacted lunati for shits and giggles. No one had information on it. So I call it a Hypthetical dyno pull/build.
It was a 433 13:1 990's .748lift 1050doml 677hp @ 7400rpm and 498 tq @ 6400rpm. 1131hp 912 tq with a maxed fogger.
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Old 03-01-2009, 02:32 PM   #15
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Default Re: What are some good 427 BBC combos with stock iron heads.

I had a 13 to 1 30 over 396 with ported Gm oval port heads, roller cam, and a fogger run 10.02 at 138 in a 3950 pound car with a 10 inch slick(4150 carb).The same motor went a 8.50 in a 2700 pound door car(dominator). All with stock gm rods and steel crank

I had a 427 with stock oval port heads run 10.30's with a fogger(4150 carb) in the same 3950 pund car. It finally broke a stock gm rod.
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