what year is 3970020
The casting number will tell you what block it is, but in some cases the block will be more than one displacement. IE 302, 327, 350ci on the same casting number (chevy)
Find the casting number on them... type "GM (insert casting number)" into a search engine and you should find what you're looking for.
Casting numbers on top of the bellhousing flange and the suffix number on the block deck in front of the passenger side head. The casting numbers will tell you which block casting you have. The suffix will tell you what HP rating it had, what it was likely installed in, and what transmission was mated to it.
check the engine block casting number
This number will tell you what year and what moter the heads will fit.There are books put out for this purpose.
A small or big block Chevy have a casting number on the top of the block behind the driver side head. MorTec has Chevy casting numbers listed online.
mines a 350 and it has the same intake casting number as yours but in order to know for sure look at the back of the engine on the bell housing next to the head on the driver side and thats your casting number for your block. that will tell you for sure
We can't even tell the make and model by serial number alone. As shocking as this may be, a serial number is not unique to only one gun. If the caliber is not marked on the gun, it will need to be examined by a gunsmith. In some cases, we make a casting of the chamber using a material called Cerro-Safe. You melt it, pour it into the chamber, and after it hardens, remove it, and measure it with a micrometer.
write down the casting number under the valve cover and compare it to the list of chevy head castings at mortec.com
If it's the original engine use the VIN number and go to your favorite parts supplier and they can tell you. If it's been changed you have to get the casting number and do some research. Or go to your garage and ask your mechanic and he will be able to tell.
With Ford, they began using this form of block casting in the late 1950's. They assigned each decade a letter which begins the casting number. 1950 began the coding with letter 'B'. Each subsequent decade received the following letter. The first number after the first letter is the year of that decade in which the part was modeled for. This means that your block casting number d4te is for a: D = 1970's 4 = 1974 T = the model is a truck E = the part is an engine component However...since that's all the casting number you provided I am assuming that it is the complete engine. That means that it is a 1974 Ford truck, presumably the 6th generation F-Series. Without more information that's all I can tell you.
casting numbers are on the back of the block. there are numbers on the pad by the head on passenger side front that will reveal information too