Which engine is in my car?

[ertoys]

Mortec.com shows these three possibilities, how do I tell which one that I have? 3892657 is the casting # on the block.

3892657....302.....67....2...Z-28 Camaro
3892657....327.....67....2
3892657....350.....67....2...Camaro

Other markings are;
E107 on back of block (pass. side)
GM 13 on back of block (driv. side)
39481 (on block, in front of pass head)

Also, on the back of the intake, behind the distributor,there is a strange opening that is blocked off. What is this?

Heads are casting #3932441 mortec shows they are for a 350. I was told the car had a 327 when I bought it. Is it a 327 with 350 heads?

:hand:

[derekf]

Pretty sure you'll need to measure the bore to know which of these it is (but isn't a 302 the same bore as a 327?)

[ertoys]

I am not sure :banghead:

[speedster]

They're all the same bore -

302 = 4.00 x 3.00
327 = 4.00 x 3.25
350 = 4.00 x 3.48

Other than knowing the right Part Number, the cheap way is to stick a thin wire down a spark plug hole and measure the stroke.

Another way is a P and G device used to measure the displacement.

[ertoys]

What about the weird hole in the block behind the distributor?

[derekf]

The only hole that comes to mind near the distributor is where the oil pressure sender screws in - could that be it? It'd be about 1/4" and maybe 3/4" away from the distributor?

Otherwise, are you able to get a pic of it?

[vintageracer]

The block is a 1967 model year 302/327/350 CID block. Casting date is May 10 1967. The block is nothing special as it was used in any 302/327/350 small block application in 1967 which included passenger cars, Camaro, Corvette etc. The displacement was determined by the crankshaft installed in the engine when built as noted in a previous post. The "stroke" of the crankshaft determined displacement not the bore of the block in this case since the bore was the same for all three engine displacements.

If the block was one of the 602 Z/28 engine blocks made for the 602 Z cars built in 1967, the ONLY way you could tell by the block was from a Z would be the engine code stamping and VIN stamping on the front pad below the right head. Since you did not post any numbers that are relevent to the front pad we do not know what type of car in which this block was originally installed. ALL the 657 blocks are the same regardless of application. These "stamped" numbers on the right front pad are lost if the block gets "decked/surfaced" by a machine shop during a rebuild.

The strange opening behind the distributor is for the road draft tube. This tube ventilated the block and ran from the back of the block to the air cleaner. Look at the very bottom of this hole and you will see a drilled/taped hole for the 1/4 inch diamter/4 inch long bolt that holds the road draft tube to the block. This tube was made of steel and was about 1 1/4 inches in diameter. It was different for each application depending on the carburator/air cleaner combination. Many times such as this there will be correct sized freeze plug installed in the hole to eliminate the road draft tube during a rebuild.

The "GM 13" is an internal casting foundry code. The "39481" on the front of the block means nothing that I am aware of. Is the number cast into the block or stamped on the pad in front of the right head? If it is stamped on the pad in front of the right head they may be code stamped by a previous rebuilder. It is not a number that would be "stamped" by the GM engine assembly plant.

The heads are later model 350 heads as you have already determined. If you can see the shape of the back end of the crankshaft where the flywheel/flexplate bolts to the crank, you can determine the crankshaft installed and therefore the original displacement. The end of the crankshaft is different for the 302, the 327 and the 350 in 1967 since this is the last year of the Chevy small block small journal crankshaft.

Anymore questions just let us know!

[Flight396]

The block is a 1967 model year 302/327/350 CID block. Casting date is May 10 1967. The block is nothing special as it was used in any 302/327/350 small block application in 1967 which included passenger cars, Camaro, Corvette etc. The displacement was determined by the crankshaft installed in the engine when built as noted in a previous post. If the block was one of the 602 Z/28 engine blocks made for the 602 Z cars built in 1967, the ONLY way you could tell by the block was from a Z would be the engine code stamping and VIN stamping on the front pad below the right head. Since you did not post any numbers that are relevent to the front pad we do not know what type of car in which this block was originally installed. ALL the 657 blocks are the same regardless of application. These "stamped" numbers are lost if the block gets "decked/surfaced" by a machine shop during a rebuild.

The strange opening behind the distributor is for the road draft tube. This tube ventilated the block and ran from the back of the block to the air cleaner. Look at the very bottom of this hole and you will see a drilled/taped hole for the 1/4 inch diamter/4 inch long bolt that holds the road draft tube to the block.

The "GM 13" is an internal casting foundry code. The "39481" on the front of the block means nothing that I am aware of. Is the number cast into the block or stamped on the pad in front of the right head? If it is stamped on the pad in front of the right head they may be code stamped by a previous rebuilder. It is not a number that would be "stamped" by the GM engine assembly plant.

The heads are later model 350 heads as you have already determined. If you can see back end of the crankshaft where the flywheel bolts to the crank, you can determine the crankshaft installed and therefore the original displacement. The end of the crankshaft is different for the 302, the 327 and the 350 in 1967 since this is the last year of the Chevy small block small journal crankshaft.

Anymore questions just let us know!


:worship: :worship:

[gt1guy]

Was the 350 in 67 a small journal? I know the 327 and 302 were, but I didn't think there was ever a small journal 350.

Kevin

[ertoys]

Thank you all for the replies. I sold the tired 327 for $500.00