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I bought an engine for my Nova and and the casting number on the block is 3877178, can I determine if is a 230 or 250 without tearing it down? It does not have the boss for the Z-Bar ball and the compression 126 +/- 3 lbs per cyl. Is there a way to read the date stamps cast towards the rear of the black casting number?
Last edited by jalopy45; 06/22/08 08:20 PM.
'45 Ford PU
66 Valiant wagon, leaning tower of power.
79 Chevy C10 w/250
02 PT Cruiser Convertable
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I have the same engine. I thought it was a 250 until I pulled the valve cover and saw the head casting number 3872708.
Chris
74 Nova 250 TH350 Daily Driver
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stamped numbers next to the distributor may help.
Otherwise, a stock 250 would have dished pistons, the 230 would be flat. Pull a spark plug and take a look.
I.I. #3174
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What are the casting numbers after "CON 2"? (passenger side by the dipstick)
Last edited by strummin67 I.I.; 06/23/08 12:38 AM.
Martin
'64 Nova wagon
'69 C10
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L14 50 ?? Sorry it took so long, been overly busy and haven't had time to get home and look.
'45 Ford PU
66 Valiant wagon, leaning tower of power.
79 Chevy C10 w/250
02 PT Cruiser Convertable
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December 14th 1975 is what I came up with. Not sure about the 0 though. So that would make it a 250. If you want get me the stamped code by the distributor and maybe we can find out what kind of sheet metal in rolled out of the factory in. 
Last edited by strummin67 I.I.; 09/11/08 04:46 PM.
Martin
'64 Nova wagon
'69 C10
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Could anyone tell me if I have a 230 or 250. It was represented as a pull from a 1967 3 Spd Camaro.,
It is stamped on a boss near distributor, " F1202LP "
Embossed on engine block, " C012 X306 3877178 GM 49"
Intake, "K306 3850381"
Exhaust manifold, "K308 GM 83 390 24"
Bill
'49 Chev Styleline
'38 Pontiac, SOHC 6 "Sprint"
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Pull the plugs and take a look at the top of the pistons, If you see a dish Then it's a 250 And yes the dish can be seen from the
plug hole as you slowly move the piston in the bore.
Larry/Twisted6 [oooooo]  Adding CFM adds boost  God doesn't like ugly.
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The 230 will have a shorter stroke-if you could somehow measure it. That was how I found out my '250' was in fact a 230, but mine had the head off at the time.
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Martin
'64 Nova wagon
'69 C10
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