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Chev cast no#

General Tech Talk

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Chev cast no#

Post by Kev80 »

Iv had a Chev engine in my boat for a few years now & was told it was a 350 when i bought it.

When i look up the cast no#s to check what size it is the same no# is used for the 302, 327 & 350. :?

Block no# - 3970010

Example -

http://www.chuckschevytruckpages.com/casting.html

So how are you supposed to know ???
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Post by V8Patrol »

V8 Chev engine & casting numbers:
http://www.geocities.com/MotorCity/5654/cblkcast.html
http://www.nastyz28.com/sbcmenu.html
http://www.donsautopages.co.nz/chevheadnumbers.htm
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bore size

Post by jessie928 »

check the stroke of the crank,

Cheers,

Jes
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Re: bore size

Post by Kev80 »



First site has no block info. (that i could find)
Second site is for crankshafts, looked up blocks on this site & still the same. Its either a 327 or 350.
Third site is for heads.


jessie928 wrote:check the stroke of the crank,
Cheers, Jes


How ?
By removing the heads & measuring the piston stroke.

I wonder how many assume they know what size their engine is. :roll:
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Post by tuff80 »

3970010 is 1 of the most common blocks,, its a High Nickel 350cu that came in both 2 and 4 bolt mains

From a website

1969-79 3970010 350ci 2 or 4bolt car, truck, Vette
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Post by trh80 »

Kev,

It is a 350 chev, 1968 - 1976 built for truck and high performance applications, it is more than likely a 4 bolt main.

Identifying the block:
Chevy small block casting ID numbers
Casting Number Inches of Displacement Years Used Used In
3556519, 3737739, 3849852 283 1958-'61 Trucks and passenger cars
360851 262 '74-'76 MONZA
3703524 265 1955 Passenger cars
3720991 265 '56-'57 Trucks and passenger cars
3731548 283 1957 ?
3789935, 3849852, 3864812 283 '62-'64 Trucks and passenger cars
3849852, 3849935, 3896944, 393288 283 '65-'67 Trucks and passenger cars
3782870, 3789817, 3852174, 3858180 327 '62-'64 Trucks and passenger cars
3782870, 3789817, 3858174, 3892657 327 '65-'67 Trucks and passenger cars
3814660, 3914678, 3932386, 3955618 327 '68-'69 Corvette, Camaro, and other high performance applications
3855961, 3932388, 3958618, 6259425 350 '68-'76 Passenger cars. 2 bolt mains.
3956618, 3970010, 3932386 350 '68-'76 Trucks and high performance applications. 4 bolt mains.
3914636, 3932373, 3970020 307 '68-'73 Trucks and passenger cars.
3951511 400 '70-'73 Heavy duty trucks and passenger cars. 4 bolt mains.
3951509, 3030817 400 '74-'78 2 bolt mains.
1. Blocks with casting number 3703524, first six months production used mechanical cams, not hydraulic.
2. Blocks with casting number 3970010, sometimes machined for 2 bolt mains.
3. '67 302 Camaro used a 327 block.
4. '68-'69 302 Camaro used a 350 block.


regards

Tony
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Post by Kev80 »

350 it is then. :D

Thanks for the info !
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Post by jessie928 »

best you check the stroke, you can check it with a hard piece of wire to get a rough estimate

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Post by Camshaft1 »

Yeah but what are you going to compare your wire with eh?
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Post by J Top »

A ruler,
350 3.48 stroke
327 3.25 stroke ?
302 3.00 stroke
305 3.48 stroke
307 3.25 stroke
265 3.00 stroke
283 3.00 stroke
267 3.48 stroke
262 + 400 ?
I thought 265 283 + 327 were all small journal, 302 could be either but most small journal ones were 283's overbored with 308 pistons which gave them low compression due to gudeon pin heights
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Post by ORSM45 »

J Top wrote:A ruler,
350 3.48 stroke
327 3.25 stroke ?
302 3.00 stroke
305 3.48 stroke
307 3.25 stroke
265 3.00 stroke
283 3.00 stroke
267 3.48 stroke
262 + 400 ?
I thought 265 283 + 327 were all small journal, 302 could be either but most small journal ones were 283's overbored with 308 pistons which gave them low compression due to gudeon pin heights
J Top


400 is 3.75 stroke

kev, i thought the same thing when i got my engine. it was a 3970010. think the heads it had on it told me it was a 350. and the build date. those websites were helpful.

MaccA
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