A couple of weeks ago I had posted a thread about a 327 build up. I am still up in the air over what to build, which is just fine since I (hopefully) won't have to replace my engine for a long time to come.

From what I know there are 2 ways to make a small block 427. One is with the a 400 block and a 4 inch stroke. The other is ridiculously expensive...the components alone were like $5,000!!!

So I would like to know if anybody has any "real" experience building or driving and maintaining a 427 small block.

In another words, parts used, application (street or strip), reliability and so on.

Thank you again.

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http://www.gruveb.com/z28

 

A 4-1/8" (+0.060") bore and 3-7/8" stroker crank (+0.125") will make a 426 CI displacement in a 400 SBC. You'll get uncomfortably close to the lower cylinder walls with much more stroke than that, and camshaft lobe clearance should be watched closely as well.

If you get a case with a taller deck and longer rods, you can go even more, but it will cost you ($$$).

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Later,
Vader
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If you want to beat the World, it might reach up and pull you down...
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really anything more then the 3.75 stock stroke on the 400 isnt really needed. its allready a pretty long stroke and still can spin a bit, stroking it out that much will really limit r's, it would make a great tracker pull or something that need alot ot torque, also all the money you would spend on the crank, rods, pistons, it would be better to jsut get a big block or build the 400 with the stock crank

 

Vader,

The block with the higher deck is a lot of DOUGH!!!$$$ OUCH. The kit is about 5 grand or so. No thank you. However, a 426 is close enough to call it a 427...doesn't really matter. So you are saying that a 3 7/8" stroker crank and a .060 over will work. I'd be safe to run the engine?

I may just end up going with a 383 after it is all said and done, but want to explore my options.

As far as a big block goes, I've looked into it and it's not very practical for my application. Too much trouble. I'd prefer to use a big block in a different car.




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http://www.gruveb.com/z28

 

a.060 overbore on a 400 is asking for trouble.from what you listed as your primary use of the motor go with a 406 it'll live comfortably on the street and will perform on the track.if you just want something to be different that's a personal choice.i like that method but it isn't practical.i would find a select 400 core and throw in a forged 3.27 crank.that would be real fun.you think rotaries spin high let that baby rip.i see it now with the right selection of components(solid roller,forged aluminum rods,sb2 heads).hp peak would be at 8300 rpm's.wishful thinking............

[This message has been edited by PETE (edited October 28, 2001).]

 

just buy a motown 427 small block...

 

or build a 396 LT1 motor, that's a nice number

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Rob P
89RSconvtZZ4TPI Edelbrock Intake
SLP Dual Cold Air Intake 1 5/8" Headers Semi-Siamesed Runners, IROC
suspension, alum shaft. Numerous mods.
92Z28convt5spd (stock)
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

 

Is the Motown block aluminum?

 

No.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

listen man a 427 small block would be to priecie, a 383 is a cool motor but u mine as well go with a 400. i thoough aboot buildind a 383 but my budie conviced me to build a 400 insted. go with a 400 dude, u will be happy and your wallet will be happy

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when the green flag drops the bull$hit stops

pulled the 350 to make way for the 406 wich is in the machine shop. got a comp 282S bump stick with 1.6 rockers. looking at differnt heads right now.Perfomer RPM and holley 650 DP, headers and 3 inch exhust. 3000 stall converter and a built 700r4. shotin for mid 12s next summer

 

I'd just go with a 400...

What kind of stroker kits can you buy for these?

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You have walked onto the biggest baddest dog porch and you will be dealt with accordingly.

I'd rather be historically accurate than politically correct!

 

The only way to do .060" over on a 400 block is to use a bowtie block. Trying to get that much displacement out of a production block is spending a lot of money on an engine that isn't going to last.

If you want big cubic inches then either buy aftermarket parts or build a big block. It'll be cheaper to build a mild BBC than a complete aftermarket big inch SBC.

Heads alone to feed a big inch SBC will cost more and not flow as much as some ported factory BBC heads.

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Follow my racing progress on Stephen's racing page
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87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

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87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley