427-SB Short Block
Thread Starter
Instructor
Joined: Jan 2003
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From: Cleveland Ohio
427-Small Block
Bill Mitchell has a 427-SB Short Block http://www.theengineshop.com/sbkits3.shtml
at $1,500.00 over the cost of a GM Performance 383 Short Block. Seems interesting. Any opinions?
[Modified by johnboy89, 9:40 PM 3/30/2003]
at $1,500.00 over the cost of a GM Performance 383 Short Block. Seems interesting. Any opinions?
[Modified by johnboy89, 9:40 PM 3/30/2003]
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
Re: 427-Small Block (johnboy89)
a dream engine. I tried to put it together on paper first. Mighty expensive. Taking into consideration switching to speed density, bigger fuel pump, tuning, half shafts :D
*note BM's #'s are based on a carburetor 12:1 compression.
*note BM's #'s are based on a carburetor 12:1 compression.
Drifting
Joined: Nov 2000
Posts: 1,483
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From: Las Vegas Nevada
Re: 427-Small Block (johnboy89)
I think if I do a bigger motor I will go 460-468 small block :D
Anyone else notice the site says its a 3.875" crank? 427's are a 4" crank... Typo is my guess...
Matt
Anyone else notice the site says its a 3.875" crank? 427's are a 4" crank... Typo is my guess...
Matt
Melting Slicks
Joined: Jan 2000
Posts: 3,418
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From: NW Chicago Suburbs
Re: 427-Small Block (johnboy89)
...thinking of FastBurn heads and a MiniRam.
Eric
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Thread Starter
Instructor
Joined: Jan 2003
Posts: 110
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From: Cleveland Ohio
Re: 427-Small Block (silver & red CE)
Here's another link on the 427 Small Block that I found:
http://www.gmhightechperformance.com...8gmhtp_motown/
http://www.gmhightechperformance.com...8gmhtp_motown/
Burning Brakes
Joined: Jan 2001
Posts: 1,169
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From: Manhattan
Re: 427-Small Block (silver & red CE)
the aluminum fast burn heads have 210cc runners http://www.gmgoodwrench.com/gmgoodwr...373§ion=ep
Thread Starter
Instructor
Joined: Jan 2003
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From: Cleveland Ohio
Re: 427-Small Block
GM recommends these heads for 350 –400cid engines, saying that they’ll add 30Hp when used on a ZZ4 engine – their literature also claims that a Fast Burn 385/350 will make 425HP with a HotCam and 1.6 rockers on that same ZZ4 short block. The ZZ430 is/was this same basic combination as well. My point here being is that this combination not only works, but appears to be reliable enough to satisfy GM.
GM also claims 497HP with their 383HT short block and FastBurn heads with a stouter roller cam (.540 lift) than the HotCam - and 9.5 to 1 CR.
BTW GM also claims these heads are appropriate for applications overt 500+HP.
These appear to be some great heads, that for some reason, in general remain underrated – you can’t always equate flow to the best head for the application – heads are more than simply their flow rate – otherwise you’d simply buy (and manufactures would simply build) the head with the biggest flow rate possible.
GM also claims 497HP with their 383HT short block and FastBurn heads with a stouter roller cam (.540 lift) than the HotCam - and 9.5 to 1 CR.
BTW GM also claims these heads are appropriate for applications overt 500+HP.
These appear to be some great heads, that for some reason, in general remain underrated – you can’t always equate flow to the best head for the application – heads are more than simply their flow rate – otherwise you’d simply buy (and manufactures would simply build) the head with the biggest flow rate possible.
Le Mans Master
Joined: Mar 2001
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From: A Pretty Part of MO
Re: 427-Small Block (johnboy89)
Wow...that's a good buy for a big inch shortblock.... :eek:
More Performance wants $5700 for a 396 shortblock assembly.
The 427 shortblock from Bill Mitchell is only $4600....
Hmmmmmmm......
More Performance wants $5700 for a 396 shortblock assembly.
The 427 shortblock from Bill Mitchell is only $4600....
Hmmmmmmm......
Melting Slicks
Joined: Mar 2002
Posts: 3,108
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From: S.L.C. UT
Re: 427-Small Block (VetteRacer282)
Anyone else notice the site says its a 3.875" crank? 427's are a 4" crank... Typo is my guess...
Matt
Matt
Former Vendor
Joined: Jun 2001
Posts: 7,204
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From: St Marys PA
Re: 427-Small Block (tpi 421 vette)
We have a 509 in the chevelle of his, with 9:1 compression its putting out 540HP and 637ft/lbs. It runs 11.4@119, with 3:90 gears. The gears are too steep for that engine and we are planning on changing them soon to 3.07s. Should help us pick up some more et. The car currently pull the front off the ground about 6 inches :thumbs:
Melting Slicks
Joined: Jan 2000
Posts: 3,418
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From: NW Chicago Suburbs
Re: 427-Small Block (johnboy89)
GM recommends these heads for 350 –400cid engines, saying that they’ll add 30Hp when used on a ZZ4 engine...These appear to be some great heads, that for some reason, in general remain underrated....
Eric
Burning Brakes
Joined: Jan 2001
Posts: 1,169
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From: Manhattan
Re: 427-Small Block (Ray383)
I found a page which lists flow numbers for the fastburns taken from "Pace GM Parts". It also has flow numbers of a few different heads. In short, it says the fastburns outflow LT4 castings and have a peak of 275cfm @ .600 lift. They are down around 10cfm from .300 lift on up compared to the numbers on this page for AFR 210's (taken from AFR's website). I have not verified any of this information, it may all be false, I don't know.
http://purplesagetradingpost.com/sum...fo/heads1.html
http://purplesagetradingpost.com/sum...fo/heads1.html
Thread Starter
Instructor
Joined: Jan 2003
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From: Cleveland Ohio
Re: 427-Small Block (Raistlin)
From my perspective at least, one advantage to running a motor such as a 427SB is that you wouldn't have to run the wildest cam or the biggest heads to make power - you could have a very streetable motor that's strong down low and still kicks-butt with all of that torque on tap. And It's nearly 200 lbs less than a Big Block.
Besides, it's a 427 - I can almost hear my C4 just beggin' for it.
Besides, it's a 427 - I can almost hear my C4 just beggin' for it.
Burning Brakes
Joined: Jan 2001
Posts: 1,169
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From: Manhattan
Re: 427-Small Block (Raistlin)
The only data I can find to back up those fastburn flow numbers is here: http://www.sallee-chevrolet.com/Fast...der_Heads.html
But they say they are "derived from a prototype head" :nonod:
I found some actual flow data from TEA posted on thirdgen.org. About 1/2 way down, look for a post by jms here
But they say they are "derived from a prototype head" :nonod:
I found some actual flow data from TEA posted on thirdgen.org. About 1/2 way down, look for a post by jms here
My results: Fastburns---Intake: .100 lift-63.1 cfm, .200 lift-133.9 cfm, .300 lift-173.3 cfm, .400 lift-209.3 cfm, .500 lift-237.3 cfm, .600 lift-257.0 cfm.
My FastBurn Exhaust---.100 lift-42.2 cfm, .200 lift-88.8 cfm, .300 lift-128.9 cfm, .400 lift-159.9 cfm, .500 lift-180.3 cfm, .600 lift-197 cfm.
My FastBurn Exhaust---.100 lift-42.2 cfm, .200 lift-88.8 cfm, .300 lift-128.9 cfm, .400 lift-159.9 cfm, .500 lift-180.3 cfm, .600 lift-197 cfm.
Drifting
Joined: Apr 2001
Posts: 1,927
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From: Portugal
Re: 427-Small Block (johnboy89)
Yea, that's a good idea. I'm getting ready to drop a 427 in my 1990. Here's how I'm doing it: http://www.diabolicalperformance.com...neModsPhI.html
:thumbs:
:thumbs: