monkfunk

I have a 58 built late April. Time to freshen up the motor and want to make sure its the right one.
The cast number is 3756519 with a big GM and a sideways 12 and there is no stamp of a vin number.
The only other number I can make out is "L58" ? Real hard to read with out sandblasting the block and on the other side of is just a "1"
Looked up the intake and it appears to be a 1957 "3837109"

Thanks in advance. Read all over the net and still not sure of details.
This numbers stuff is real complicated!!!

zadspal

Mark, If I understand the question correctly..Your engine should have an engine casting # ending in 739 you also want it to be an "F" for flint and your casting date should end in 8 not 58 which was passenger car. Your engine date should preceed the car 4 to 8 weeks.
Example: F C128 (March-12-58) would be a good date for your car. Also a reminder! The engine pad that is stamped did not get the Vin # until mid 1960, only the engine production date would appear there. I hope this helps you.

stingrayl76

3756519 blocks were used mid-to-late 58 thru late 61 model years.

emccomas

What info is stamped on the front engine pad? Should be something like FxxxCS, where xxx are three digits. The C could be a D if the car is an automatic. The S could be something else.

monkfunk

The Engine pad is blank. Nothing but a little rust and pits. The L58 could be a L50. Other than that there are no other Cast numbers on the block. I too read that 3756519 was mid to late 58 but does May count as Mid to late 58? My Vin ends with 107424 that shows the very end of April / beginning of May.

Thanks again for all the information.

JohnZ

There's no "F" prefix on the block casting date - only on the pad stamping. The casting date example would be C 12 8 for a Flint block.

L 5 8 (December 5, 1958) is a legit casting date for a Flint block; if it was a Tonawanda block, the same date would be L 5 58.

zadspal

I agree this is in print, In the NCRS fourth edition judging manual page 45, it says "1958 & early 1959.....3737739" Then it also says "Late-1958 through 1960.....3756519" But! according to Mark his car's Vin is 10724 and the 5th edition Birthday Book says this cars build date was
Nov 7th of 57 so this should be an early car. If this is true it will be a 739 engine block. The intake that Mark has described, I'm not familiar with but the judging guide says 1958 230hp intake cast # is 3746829. I think Mark has a early car with a replacement engine. This would explain the early componants like the intake but with no stamping on the forward engine pad.

kenba

I think the intake was listed as possable fer a 56
KEN

JohnZ

That's correct - he needs a 739 block; I didn't notice the VIN yesterday.

monkfunk

After looking at the http://rowleycorvette.com/stats58.html web site.
It shows my Vin number JS582107424 as a late April early May Vin.
April -106544
May - 107489
Where do you see November ?
Mark

zadspal

Mark, you had posted your VIN# as 10724 and that would be Nov. Now that I have your correct VIN# your car was built somewhere between
2:00 & 3:00pm on May the 27th 1958. I will do a search and let you know what I find out about when the 519 blocks came out. This is a bit tricky but with a little research your car should be much more correct and that will add dollar$ to it's value. This site is the best I've ever found for this sort of help. Most of the guys and girls here know thier stuff when it comes to Corvettes. Noland Adams, The complete Corvette Restoration & Technical Guide-Vol.1 is a book that every C-1 owner should own.

monkfunk

Oops
Looked again and had a typo Its not 10724 is 107424.

Sorry

monkfunk

Sorry about the mix up.

zadspal

Mark, I have talked this over with a friend of mine who has judged the 58's on a national level and he said that in early 59 there were still some 739 blocks showing up even though the 519 was introduced in late 58. No matter what month your car was built in 58 you will not go wrong with the 739 block and if you attempt to use the 519 you will definately raise some brows and may not ever have any sound proof of it being correct for your car built in May. I personally would not risk it. I have searched every source available to me for the answer "When" did the 519's first show up in 58 and it's still a mystery. To pin this down to an exact month, I don't know? Out of all who I have ask this question to I would say around Aug or maybe even Sept would be close.
Now for the intake: I don't find the 3837109 to be correct for the 57 or 58 Corvette. It may have come along much later? If your going to do an engine rebuild and freshen it up I would go the extra distance and do it right. The value of your car later on down the road will pay you back for all of the hard work and efforts. I hope this information helps you. This forum is the best on the net and so are the friends here too!
Scott