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Both numbers were on the pad in front of the head.
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r
David,
Those do not appear to be Corvette numbers. The block casting number on a GM small block is on the top of the block near the bellhousing. If the motor is cruddy it will be hard to see. You may need to use a flashlight to see it. It will be raised numbers, usually six or seven digits.
Scott
Those do not appear to be Corvette numbers. The block casting number on a GM small block is on the top of the block near the bellhousing. If the motor is cruddy it will be hard to see. You may need to use a flashlight to see it. It will be raised numbers, usually six or seven digits.
Scott
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Ranger OK lets ask a stupid question the bell housing on the back of the engine that connects to the tranny right?
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Hey here are the numbers that I got off the back driver side
5GM
3956618
These I got off the back passenger side
B258 or B250
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OK according to the numbers it is a 302 327 or 350? How do I which one?
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r
According to my book the B258 means the block was cast February 25,
1968. That date range would make a 3956618 block a 327. If it was
a 1969 casting it would be a 350. I doesn't say what car it was
buikt for. I am sure when Joel sees these numbers he will narrow it it
down. Help us out Joel!
Scott
Scott
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Duncanville, TX - USA
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Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
3956618
This block was used for:
'69 302 Camaro Z28 (early '69, 4 bolt main)
'69 350 Corvette 300/350 hp, 4 bolt main
'69-'74 350 Passenger car, Shevelle, Camaro, Nova, Monte Carlo
'69-'76 350 Truck
Are you certain the casting # is not 3955618?
That would make it a large journal 327, used in '68-'69, Passenger, Camaro, Shevelle, and Nova.
If the info I found on the suffix code is correct(YB= 1968 327 220HP 4bbl Powerglide Camaro), that would make more sense.
This block was used for:
'69 302 Camaro Z28 (early '69, 4 bolt main)
'69 350 Corvette 300/350 hp, 4 bolt main
'69-'74 350 Passenger car, Shevelle, Camaro, Nova, Monte Carlo
'69-'76 350 Truck
Are you certain the casting # is not 3955618?
That would make it a large journal 327, used in '68-'69, Passenger, Camaro, Shevelle, and Nova.
If the info I found on the suffix code is correct(YB= 1968 327 220HP 4bbl Powerglide Camaro), that would make more sense.
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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Well thats it. It is a 1968 327 220 thanks for the help. I guess do I rebuild the 327 and super it up or just go with a crate 350 with some teeth? it does to seem to have some pep to it now.
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r
David,
That is a personal choice. It depends on what kind of driving you plan to do. If you plan on just enjoyable cruises and not racing why spend tons on build ups. A 327 is one of my all time favorites. If it were my car I would run that engine unti it's tired and needs a rebuild. Then I would go through the engine and maybe play with a cam, heads, carb, and headers. It,s a fine engine to tune.
Best of Luck,
Scott
That is a personal choice. It depends on what kind of driving you plan to do. If you plan on just enjoyable cruises and not racing why spend tons on build ups. A 327 is one of my all time favorites. If it were my car I would run that engine unti it's tired and needs a rebuild. Then I would go through the engine and maybe play with a cam, heads, carb, and headers. It,s a fine engine to tune.
Best of Luck,
Scott
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Hey Apple I double check the engine code and it is a T05141HB not YB what does this tell you?
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in Forum: C3 Engines, Driveline and Handling
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