zaczacwright

Okay so i bought a what i think is a 350 for my 89 RS, but after my buddy told me to run the casting numbers it said it was a 327. I cant find the VIN number as to i have no clue where it would be since all i have is the block. The only numbers ive found were 3970010 K2 and K11 10 CMJ. and on the side i found markings that say 5 L 7. Can someone please help me out here and tell me what i have

AlkyIROC

Welcome to TGO

The 010 blocks are a 4" bore. 302, 327 and 350 engines all used that block. The only way to know the displacement is to find out the stroke.

CMJ was used in 2 different castings. A 1980 305 and a 1974/75 350. Since you have a 4" bore casting, the engine is a 350 unless someone changed the stroke.

zaczacwright

And how do i do that? im new to this lol

zaczacwright

Oh and can someone tell me where the VIN number is, and what the other markings mean?

zaczacwright

I forgot to add its a 2 Bolt Main

AlkyIROC

You'll only find a partial vin number on the engine in the same place as those stamped numbers are. They won't mean much since the engine probably isn't original any more and won't tell you exactly what it came from. You have a 74/75 4" bore block. After that, the only way to know what's in the engine is to strip it down for inspection.

zaczacwright

Well the guy i bought it from said its bored .30 over, the block is all stripped down, it is only block, cam bearings and freeze plugs. The only thing i found in the back was 010 and 979

zaczacwright

And the only thing stamped where i found the engine code was that 3970010 number and K2, nothing else but the 010 and 979 number was where the transmission bolts up to

Apeiron

3970010 is the most common 4" bore block with a 2 piece RMS. There's nothing else on the outside of the block that will tell you any more about what's inside.

zaczacwright

So is there a chance i have a 327?

sofakingdom

iTrader: (1)

A 327 and a 350 are THE SAME BLOCK. What you have is NEITHER right now, because the difference is, THE CRANK.

However, the 327 was discontinued after about 72; so since you have a 74ish block, it started out its life as a 350.

You could stick a 302, 327, or 350 crank in it, and it would become one of those things instead of merely a block with a 4" bore. Or even, a crank with more stroke still, and get a 383 or 396.