Thread: newbie with a 402

Tweet

Well i'm brand new to the forum thing and the Big Block too. I recently bought an 85 chevy stepside with a 402 BBC. Now the guy i bought it from said it's a straight 402 and not a 396 bored out. I havent a clue about it. He also said the tranny is a 700R and it has a posi rear end. Thats about all i know about it. Anything anyone can say would be greatly appreciated. Thanks!!

nope i did not build it very hard to say what if any been done to it... i can not tell you much the bore from a 396 to a 402 is only 030 many ways to go on heads pistons cams . so if you did not get numbers then it any one guess

Hello, 85SuperChev, I have the Chevy by the numbers books. If you give me any casting numbers from your block, heads, or what not, I can give you the year and model vehicle it came from. I have a 70 402 in my 68 SS Camaro. Well, it isn't in there as we speak, but, it is all over the garage and the car is an empty shell. If you wish I'll run the numbers if you post them here. My books only run, 55 thru 75 so those are the only years I can assist you with. From what my book reads, the 402 was only produced for 3 years 1970 to 1972. Sorry can't help you with the tranny or rear end, but they all have casting numbers, and you can ask here, or "google" them and I am sure you'll get an answer!

CapeCodRon

Well, like Pat says Hardly any real difference between those 2 but if he said u have a straight 402, I am willing to bet he meant a 1974-72 block, best way is to look at the engine stamped code that is on the end of the block. on the pad just under the alternator, assuming that is the passenger side of the truck. My guess you will find a CLB code motor

Originally Posted by sleeve396

Well, like Pat says Hardly any real difference between those 2 but if he said u have a straight 402, I am willing to bet he meant a 1974-72 block, best way is to look at the engine stamped code that is on the end of the block. on the pad just under the alternator, assuming that is the passenger side of the truck. My guess you will find a CLB code motor

.. i put both my hands on the valve covers and can tell you how much power them BBC can make

Thats not how Pat does it.........He puts both hands on the valve covers, begins mumbling, chanting, sweating, then he commands!! HORSEPOWER EXORCISM......suddenly your baby rat will have balls.....Big Un's!!

Thanks guys for the info... i recently came across some more info on the truck and its got an edelbrock 750 carb on it and apparently has a 3/4 cam set up in it also. Has a 700R tranny in it with a shift kit. Im gonna get the numbers off the block next time i get under it and see what it says and post it on here.

Originally Posted by pat mccarthy

.. i put both my hands on the valve covers and can tell you how much power them BBC can make

HMMMMMM, the laying on of hands by Minister McCarthy!!

ok so my uncle whos been a mechanic for years looked at the stamped code just under the alternator and it said T1012CTB... now can anyone tell me anything about this number?

Scroll to the bottom of this page....
Big Block Chevy Engine Suffix Stamping Codes
The T is Tonawanda factory and the numbers are the date code when it was built.

he just meant it came from the factory as a 402, which is the same engine as the 396 but with .030 bigger bores. He must have just meant it wasn't torn down and bored later on. I have the same motor.

T1012CTB decodes as follows:
T=Tonawanda Plant
01= January
12= Twelve
CTB= 1972, 396 and 400 (LS-3)