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#1
01-14-2018, 09:41 AM
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I cant easily get the block or head dates codes, but I can faintly see the block casting number in a picture I've dug up it "appears" to be 1203. The Pontiac paperwork shows the car shipped to the dealer 5-10-74. Unfortunately the cast eagle crank in this block, installed by the prior owner, failed the thrust bearing test while doing a cam change. I'm having the motor gone through with a new forged crank, rods, etc..leaving no stone unturned.
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#2
01-14-2018, 07:23 PM
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At 1st I was going to say it probably is an 'I', but I have a lot of SD's at 'L' 203.
Probably the last batch of SD's cast? 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#3
01-15-2018, 08:12 AM
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The closer I look at my fuzzy picture, it very well could be L203
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#4
01-15-2018, 10:09 AM
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Washers
421 SD Engines used head bolt and main cap bolt washers as well.
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#5
01-15-2018, 10:16 AM
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Washers
These should work.
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#6
02-25-2018, 01:57 PM
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There was a SD455 service block advertised for sale on this forum awhile back. I remember the cast date being March 1974.
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#7
02-25-2018, 05:45 PM
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I should have said last batch cast in 1973.
 While a lot of 74 SD cars still had 73 cast date blocks, later part of model run the 74 cast dates started. I'd have to see when the 74 cast dates seemed to start appearing on 74 SD cars and the build date possibly.
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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