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Hi, new to the forum, and have the experts tell me what my engine block are
I bought this block many years ago with a set of Venolia pistons, block was supposed to be a 454 Hi perf. 4 bolt mains overbored ,120''.
Was planning on making a race engine of that, but now i have digged it out of storage and my thougts was to idetify it.
Here comes the good part, all my research it turns out to be a 1968 corvette block, 427/ 4 speed block.
Here are the casting numbers
Rear l.h. deck 3916321
Date code cast L8 7
Front pad stamped outer F0219IR (the F letter i am not shure of, it seems like a T missing half of the top to the left)
Front pad stamped inner 18S413732
Hope someone can tell here and verify
Hi, new to the forum, and have the experts tell me what my engine block are
I bought this block many years ago with a set of Venolia pistons, block was supposed to be a 454 Hi perf. 4 bolt mains overbored ,120''.
Was planning on making a race engine of that, but now i have digged it out of storage and my thougts was to idetify it.
Here comes the good part, all my research it turns out to be a 1968 corvette block, 427/ 4 speed block.
Here are the casting numbers
Rear l.h. deck 3916321
Date code cast L8 7
Front pad stamped outer F0219IR (the F letter i am not shure of, it seems like a T missing half of the top to the left)
Front pad stamped inner 18S413732
Hope someone can tell here and verify
Front pad stamped inner 18S413732
Yes, it's 1968 Corvette 427/435hp block, cast in '67.
The left stamping begins with a T; all Corvette big blocks were cast and assembled at Tonawanda NY engine plant.
The 18S413732 is a partial VIN for the original car which designates 1968, St. Louis, #13,732 - these indicate it came in a Corvette as does the IR engine stamp for '68.
The IR code indicates a 435 HP 427. Solid lifter, tripower, rectangular head, 4 bolt main block. These were 4 speed only. 2898 were made in 68.
Should have a good forged steel crank too.
Have any more of the original engine?
They made near 10,000 of these over 4 years, so not incredibly rare. Although certainly desireable.
But a 120 bore job is pretty big.
Some blocks can handle that, but it should be sonic checked for wall thickness before use.
It would be worth the most to the serial # matching car, or another 68 owner who needs a close to correct engine.
You should post this is the lost parts thread.
I missed that it was 0.120" over-bored. Being that open, is it feasible to bore whatever would be necessary to insert sleeves - or has that option been removed from the table?
Thanks, you made my assumptions right, sadly i do not have any of the other parts for the engine, as said, i bought it back in the 80's with the set of Venolia pistons, it was already oversized then and i was thinking back then to build a 511 stroker with a blower.
I bought it as a 454 High performance w/4 bolt mains, and it got tucked away for a long time.
When discovering that this could possibly be a 427/435 horse, i am starting re-thinking what to do here, the most value will be to sleeve it back to standard bore.
Have already asked for a quote from a machine shop, so when i get that i will decide what to do.
Anyone know the value of this sleeved back to std bore
Best regards
Lars
My local machine shop charges $125/cylinder to sleeve. And it needs decked afterwards which would remove the numbers- unless you find a shop that can save it.
most value is to the car owner if that car still exists. I don’t think you would get your money back paying to have it sleeved
I believe the maximum safe bore on most old blocks is 0.060 today.
Any more than that causes overheating issues at the banks of cylinders. There's just not enough "meat" to bore wildly.
The cylinder becomes too thin, the coolant can no longer keep the block cooled and bad things start to happen.
Back in the late 60's I had a 283-block bored 0.125 to reach 301-302. (that was due to a modified class restriction)
The machinist refused the job at first.
Then realized it was a 1958-59 block. Extra thick walls back then.
Engine block
