snake 309

Im Looking To Drop A 350 Into My Iroc, I Found One For Sale But I Want To FInd Out Exactly What It Came Out Of Before I Do So. Im Having Trouble Decoding This One So Hopefully You Guys Can Help. This Is All The Numbers The Guy Gave Me To Go By So Bear With me.

Block Casting Number: 3914678
Block Id Number: V0510yw
Heads Casting Number: 3927186

Any Help Would Be Appreciated!!!

8Mike9

try www.mortec.com

snake 309

Thank You For The Reply But I Have Looked Up The Casting Numbers And Sorta Know What Motor It Is But There's Gotta Be Something Out There That I Can Look Up The Block Id Number That Tells Me Exactly What It Came From, How Much Horsepower, Ect.

midias

Nope

Only real way is to open it up and dyno it. It is also reasonable that in the last 40 years something was changed

snake 309

Okay Then, The Next Number I Think I Need To Locate The Serial Number Then And Try To Research That way

Night rider327

iTrader: (13)

Here's what I come up with

3914678 1968 302/327/350 2 bolt main block

V= Flint engine plant
05 = 5th mo. (May)
10 = 10th day of mo.
YW = Is not correct for this block. Only SBC YW suffix code comes up as a '66 327 truck engine as alky mention.. The block casting is later than the suffix stamp so that's not right and can't be it. The other YW codes come back as a 427 bbc and 400 and 455 pont. engine.

With sbc stamp numbers it's real easy for one letter to look like another. I bet you it's really a YU or YV suffix code.
Both of those are 1968 327, 220 HP truck engines, which goes with the '68 block casting number

Heads Casting Number: 3927186 is 1968/69 302 / 327 and 1970-72 350.. 2.02"/1.60" valves. Camel hump heads, 64cc chamber, 160cc intake ports. with acc. holes in end of heads. Flow about 187 cfm intake, 135 cfm exhaust stock.. So not real great

Now on the block, keep in mind that's factory. It's a large journal 327, so a 350 crank will fit right in it, as well as 350 pistons..

So with out opening it up and seeing whats inside you really can't be sure what it is, but it left the factory as a 1968 327.

snake 309

Okay Wow Thank You For The Info, He Was Telling Me It Was Some High Performance 350 From 1969

sofakingdom

iTrader: (1)

EVERY used 350 is out of a 69 "Z/28" or a 70 Vette "LT-1". ALL of them. I thought EVERYBODY knew that???

The stamping number on the block is related to the pistons the factory used, the cam they put in it, the heads they bolted to it, the intake they put on it, and the carb they used. (among other things) Do you HONESTLY hallucinate, in your wildest dreams, that even ONE of those things is still there, let alone ALL of them?

That number tells you about the MOTOR the BLOCK was part of when it was originally built. It DOES NOT tell you anything about what has happened to the BLOCK since then.

There is NO USEFUL INFORMATION left in those numbers the instant the motor is torn down the first time. It will not tell you anything at all, NOT ONE SINGLE THING, about what the motor is NOW, how much power it makes NOW, what parts are in it NOW, or ANY THING ELSE about the motor NOW.

You can take a block with a stamping that says "74 Impala 350 2-bbl" and turn it into a 650 HP race motor; or one that says "70½ Z28 LT1" and turn it into a motor that won't pull a greasy string out of a cat's a$$. It's done both ways basically every day.

Forget that number, it is WORTHLESS.

The heads are fairly decent old heads, some of the best of 69-70 technology.

Now find out what pistons are in it, what cam is in it, who built it, what some of the clearances and tolerances were set to, what machine work was done to each of the parts, and so on; THEN you'll know a little bit about what the MOTOR is NOW. Don't waste you time and effort on figuring out what motor the BLOCK was part of from the factory; odds are quantum-mechanically small that whatever MOTOR is built in that BLOCK now, bears NO RESEMBLANCE WHATSOEVER to whatever MOTOR was built out of that BLOCK by the factory.