Stamped Engine ID #'s
01-11-2017, 04:46 AM
#11
Gold Member
Rob I have serial #'s for both blocks (N6372 & N6373) but I don't think that identify's the the origin.
http://flagshipengine.com/ only built Hi Po engines from GM blocks...my issue is, are they 540's
or 572's?...........the son of the owner swears they're 540's yet the dyno sheet says 575's which totally
confuses me.......even if I find the casting #'s off the blocks ...would that even identfy what cu. in. engines
I now have in the boat?
http://flagshipengine.com/ only built Hi Po engines from GM blocks...my issue is, are they 540's
or 572's?...........the son of the owner swears they're 540's yet the dyno sheet says 575's which totally
confuses me.......even if I find the casting #'s off the blocks ...would that even identfy what cu. in. engines
I now have in the boat?
From there, you have several theoretical engine sizes that could be derived from either block.
I'm assuming you have standard BBC architecture (low deck), and as such, the engines could theoretically range from as small as 502 (really 396) to the upper 500's
The only way to tell that I'm aware of is to physically measure bore and stroke and do some math. That said, I beleieve there is some instrumentation that can be used to measure CID, but that's beyond my pay grade.
01-11-2017, 07:21 AM
#12
Registered
if they are custom engine #'s are only going to tell you what that block was at the start..454, 502, etc and what application after final assembly, if the block has been decked #'s may be gone
01-11-2017, 07:41 AM
#13
Platinum Member
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The casting numbers are not on the machined pad on the from of the engine they are cast into the block, those would be VIN and suffix codes, See if there is an 8.2 cast in the side of the block around where the oil adapter is mounted, if so then its a 502, the only way you can tell what cu, in they are is to measure the volume of the cylinder.
Edit, if the head is off you can check bore x stroke = cu in
Edit, if the head is off you can check bore x stroke = cu in
Last edited by F-2 Speedy; 01-11-2017 at 07:53 AM.
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01-11-2017, 06:27 PM
#15
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Identifying the casting will tell you if the block is a "low deck" or "tall deck".
From there, you have several theoretical engine sizes that could be derived from either block.
I'm assuming you have standard BBC architecture (low deck), and as such, the engines could theoretically range from as small as 502 (really 396) to the upper 500's
From there, you have several theoretical engine sizes that could be derived from either block.
I'm assuming you have standard BBC architecture (low deck), and as such, the engines could theoretically range from as small as 502 (really 396) to the upper 500's
