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04-12-2011, 02:08 AM
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#1 |
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Registered User
Join Date: Apr 2011
Location: denver colorado
Posts: 2
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how do i identify a sb400 just from looking at it?
my friend just bought a 79 chevy but we are not sure if its a 350 or a sb400 how can we find out?
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04-12-2011, 02:36 AM
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#2 |
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GoatLube Experss
 
Join Date: Oct 2009
Location: clarksville, Tn.
Posts: 1,337
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Re: how do i identify a sb400 just from looking at it?
the casting # behind the DS head will be 3951529. if yours is differant Google SBC casting numbers, youl find a chart that will tell ya what it is.
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Goat Lube Express, locations in Qalat,Afghanistan & Clarksville, Tn. '87 R30 dually 454/TH400 '85 1/2 ton CCSB '92 S10 350/350 '84 MonteCarlo 383/PG/9"ford '78 Malibu wagon 350/350 '78 Cutlass (project family car) '96 S10 Jimmy (Moma's) Last edited by jitteryguy; 04-12-2011 at 02:37 AM. Reason: spell'n |
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04-12-2011, 04:19 AM
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#3 |
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GoatLube Experss
Join Date: Oct 2009
Location: clarksville, Tn.
Posts: 1,337
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Re: how do i identify a sb400 just from looking at it?
here's a list of cast'n #'s, there are more 400's than I had in my record's here.
1980-85 140029 350 - - 2 car 1973-80 330817 400 - - 2 car, truck 1975 355909 262 - - 2 car, truck 1976-85 355909 305 - - 2 A 1975 360851 262 - - 2 Monza 1976-79 361979 305 - - 2 car, truck 1978-86 366245 350 - - - car 1982-86 366286 350 - - 4 Chevrolet, siamese 1982 366299 350 - - 4 Chevrolet, aluminium 1956-67 383810 283 - - 2 - 1967-68 389257 302 - - 2 Z-28 1968-73 391436 307 - - 2 - 1965-67 393288 283 - - 2 car, truck 1976-79 460776 305 - - 2 car, truck 1976-79 460777 305 - - 2 car 1978-79 460778 305 - - 2 car, truck 1979-82 471511 267 - - 2 car, truck 1976-85 581671 305 - - 2 A 1985-94 1489363 350 - - 2 - 1979-82 2135412 267 - - 2 - 1979-82 2404929 267 - - 2 1973-76 3030817 400 - - 2 car, truck 1958-61 3556519 283 - - 2 car, truck 1955 3703524 265 195 _ 2 car, no filter 1955-56 3720991 265 195 225 2 car, truck 1957 3731548 283 220 283 2 - 1956-67 3736935 283 - - 2 - 1957-59 3737739 283 220 290 2 car, truck 1958-62 3756519 283 230 315 2 car, truck 1956-67 3756935 283 - - 2 - 1962-65 3782870 327 250 375 2 car, truck 1956-67 3789187 283 - - 2 - 1962-67 3789817 327 210 275 2 car, truck 1961-64 3789935 283 230 315 2 car, truck, Vette 1966-67 3790721 283 - - 2 Chevy II 1964-67 3791362 327 300 300 2 Chevy II 1958-62 3794226 283 220 220 2 truck 1968-69 3794460 327 250 250 2 truck 1968-69 3814660 327 - - 2 F A 1968-69 3814660 302 - - 4 Camaro, Z-28, Vette 1956-67 3832338 283 - - 2 - 1956-67 3834812 283 - - 2 - 1958-62 3837739 283 - - 2 - 1957-66 3849852 283 220 - 2 car, truck 1956-67 3849859 283 - - 2 - 1956-67 3849935 283 - - 2 - 1964-67 3852174 327 - - 2 car, truck 1968-76 3855961 350 - - 2 car 1964-67 3858174 327 300 - 2 A 1964-67 3858180 327 250 - 2 - 1962-67 3858190 327 - - 2 - 1966-67 3862194 283 - - 2 Chevy II 1962-66 3864812 283 230 - 2 car, truck 1964-67 3868657 327 300 - 2 1962-67 3876132 327 - - 2 1963 3889935 283 - - 2 truck 1962-67 3892657 327 - - 2 car, truck 1967 3892657 302 290 - Z-28, small journal 1968-69 3892659 327 210 - 2 1962-66 3896944 283 230 - 2 1965-67 3896948 283 - - 2 1964-67 3903352 327 250 - 2 1969-80 3911460 350 - - 2 A 1968-73 3914635 307 - - 2 car 1968-73 3914636 307 - - 2 car, truck 1968-69 3914638 327 - - 2 1968-73 3914653 307 - - 2 A 1968-69 3914660 327 250 - 2 truck 1968-69 3914678 302 290 - 2/4 Camaro, Z-28 1968-69 3914678 327 210 295 4 car, truck 1968 3914678 350 210 295 4 cars 1965-67 3932288 283 - - 2 A 1956-67 3932338 283 - - 2 1974-75 3932368 350 - - 2 1969-73 3932371 307 - - 2 car,truck 1969-73 3932373 307 - - 2 car,truck 1968-69 3932386 350 300 350 4 LT1,4 1968 3932386 327 - - 2 A 1969 3932386 302 290 - 4 Camaro,Z28 1969-76 3932388 350 165 300 2 car,truck 1968-69 3933100 327 - - 2 1968-69 3933180 327 - - 2 1968 3941174 307 - - 2 truck 1956-67 3949852 283 - - 2 1973-80 3951509 400 - - 2 car,truck 1970-73 3951511 400 - - 4 truck 1962-67 3953512 327 - - 2 1968-69 3955618 327 - - 4 A,F,Vette 1969 3956618 302 290 - 4 Z28 1969-79 3956618 350 165 350 4 car, truck, vette 1969-76 3958618 350 - - 2 A 1962-63 3959512 327 250 - 2 1956-67 3959532 283 - - 2 1968 3970010 327 - - 2 A 1969-79 3970010 350 185 370 2 or 4 car, truck, Vette 1968-76 3970014 350 - - 2 car,truck 1969-73 3970020 307 - - 2 car,truck 1968-76 6259425 350 - - -
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Goat Lube Express, locations in Qalat,Afghanistan & Clarksville, Tn. '87 R30 dually 454/TH400 '85 1/2 ton CCSB '92 S10 350/350 '84 MonteCarlo 383/PG/9"ford '78 Malibu wagon 350/350 '78 Cutlass (project family car) '96 S10 Jimmy (Moma's) |
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04-12-2011, 07:28 AM
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#4 |
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Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: how do i identify a sb400 just from looking at it?
There are ONLY 3 casting numbers for SB 400's, they'll end in 511 (early, most are 4-bolt), 817 and 509. The early 509's are the best, they have more beef in main webs and a couple of other areas.
Harmonic balancer will be external balance. If it's stock, you'll see where material has been machined off around most of the outer ring, where a 350 will be smooth and the same thickness all the way around. SOME 400 blocks have 3 core plugs on the block, some have 2 with the boss for the center one and most of the 509's have 2 core plugs with no unused boss. That's why they're called "cheater" blocks, they look more like a 350. If you're looking at the side of the block, it will be raised slightly around the cylinders where a 350 will be perfectly flat. If that '79 has it's original block, it will either be an 817 or 509, head casting numbers should end in 882. Stock crank is fine, it's nodular iron versus most cast small block cranks which are plain cast iron. They respond well to cam swaps, really wake up with a pair of Vortec heads, make sure to keep compression around 9:1. It'll pull like a big block. |
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04-12-2011, 10:28 AM
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#5 |
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Registered User
Join Date: Dec 2010
Location: Visalia, Ca
Posts: 707
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Re: how do i identify a sb400 just from looking at it?
I agree with the above and the 817's are the most common
Here is a list more narrowed down to 73-87 blocks Small Block Chevy Casting Numbers Year Casting CID L-hp H-hp Mains Comments 1973-80 330817 400 150 180 2 car, truck 1976-85 355909 305 - - 2 A 1976-79 361979 305 - - 2 car, truck 1976-79 460776 305 - - 2 car, truck 1978-79 460778 305 - - 2 car, truck 1979-82 471511 267 - - 2 car, truck 1976-85 581671 305 - - 2 A 1979-82 2135412 267 - - 2 - 1979-82 2404929 267 - - 2 1973-76 3030817 400 - - 2 car, truck 1970-80 3951509 400 150 265 2/4 car,truck 1969-76 3958618 350 - - 2 A 1969-79 3970010 350 185 370 2 or 4 car, truck, Vette 1968-76 6259425 350 - - - car,truck 1978-86 14010231 305 - - 2 - 1979-82 14016375 267 - - 2 - 1978-85 14016379 350 - - - car, truck 1978-88 14016383 305 - - 2 - 1979-82 14040205 267 - - 2 - 1978-86 14049047 305 - - 2 1969-85 14316379 350 - - 2
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<Brandon> 1974 Chevrolet K5 Blazer 350sbc/SM465/NP205, dana44 front, corp 14bolt rear with 4.10s and a powertrax locker, custom rear bumper 400sbc in the works.  1981 GMC C1500 stepside 250i6, 3spd, 12bolt with 3.08s 2.5/4drop on 15x10 with 275/50r15 81 GMC C3500 cab-chassis dually with utility bed 350sbc, Sm465, 14bolt with 4.10s nv4500 getting ready to go in 1979 Chevrolet K5 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434096 1976 Chevrolet C10 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434195 Last edited by bmchevy1979; 04-12-2011 at 10:31 AM. |
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05-10-2011, 10:33 PM
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#6 |
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Registered User
Join Date: Dec 2010
Location: sioux city, iowa
Posts: 619
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Re: how do i identify a sb400 just from looking at it?
"SOME 400 blocks have 3 core plugs on the block" and they have a big ass balancer because they are externaly balanced.
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05-10-2011, 10:37 PM
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#7 |
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Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: how do i identify a sb400 just from looking at it?
^ some 400's have balancers that are smaller in diameter than 350's, it's the cut away section that gives 'em away...unless someone has spend the coin to have it internally balanced, like the Lunati crank I have.
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05-11-2011, 07:51 AM
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#8 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,454
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Re: how do i identify a sb400 just from looking at it?
Never seen different sized balancer. I've had a dozen or so 400s....
Quickest easiest is to look at the balancer like what was mentioned above.
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
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05-11-2011, 08:02 AM
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#9 |
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Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: how do i identify a sb400 just from looking at it?
All factory 400 balancers I've seen are 7", but I've seen a few 350's built with 8 inchers, looked like dang big block balancers hanging off the front of 'em.
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