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Chev cast no#
Posted: Tue Apr 26, 2005 9:07 pm
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 ???
Posted: Tue Apr 26, 2005 9:37 pm
by V8Patrol
bore size
Posted: Wed Apr 27, 2005 1:22 pm
by jessie928
check the stroke of the crank,
Cheers,
Jes
Re: bore size
Posted: Wed Apr 27, 2005 6:22 pm
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.
Posted: Wed Apr 27, 2005 7:59 pm
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
Posted: Wed Apr 27, 2005 8:14 pm
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
Posted: Wed Apr 27, 2005 8:42 pm
by Kev80
350 it is then.
Thanks for the info !
Posted: Thu Apr 28, 2005 10:31 am
by jessie928
best you check the stroke, you can check it with a hard piece of wire to get a rough estimate
JEs
Posted: Fri Apr 29, 2005 5:27 pm
by Camshaft1
Yeah but what are you going to compare your wire with eh?
Posted: Fri Apr 29, 2005 8:43 pm
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
J Top
Posted: Sat Apr 30, 2005 4:45 pm
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