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chevybuldr · 03-11-2016, 02:03 PM

The L 5 3 on the back of the block and also similar on the heads is the casting date. The 010 is the casting number for the block. The numbers on the head surface pad is what makes it specific for your truck. The left number should match your vin. The number on the right is prefix code that tells where and when it was assembled and what exactly it was power wise.

Word of caution on those heads, the vortec heads are known for cracking. It would be a good idea that you have the heads magnafluxed for cracks. The surface on them also is very crude. You really need a very true and flat surface. I would highly suggest a visit to your local machine shop. Having things done now is a lot cheaper then being bent over the fender doing it a second time. This is not my shade tree opinion then is my machinest opinion. I have seen more then my fair share of them.
You have a great build thread going on just read thru it, keep it up love a budget build. Great save on an old truck.

03-11-2016, 02:03 PM	#2932
chevybuldr Registered User Join Date: Oct 2008 Location: Livermore ca Posts: 699	Re: Restoring Rusty The L 5 3 on the back of the block and also similar on the heads is the casting date. The 010 is the casting number for the block. The numbers on the head surface pad is what makes it specific for your truck. The left number should match your vin. The number on the right is prefix code that tells where and when it was assembled and what exactly it was power wise. Word of caution on those heads, the vortec heads are known for cracking. It would be a good idea that you have the heads magnafluxed for cracks. The surface on them also is very crude. You really need a very true and flat surface. I would highly suggest a visit to your local machine shop. Having things done now is a lot cheaper then being bent over the fender doing it a second time. This is not my shade tree opinion then is my machinest opinion. I have seen more then my fair share of them. You have a great build thread going on just read thru it, keep it up love a budget build. Great save on an old truck.