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post #1 of 21 (permalink) Old 10-26-2012, 08:07 AM Thread Starter
 
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1962 pontiac block

I am looking at A 4 bolt main on a 1962 pontiac block could someone help me out on block ID maybe 421 casting #538181
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post #2 of 21 (permalink) Old 10-26-2012, 09:17 AM
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# 538181 was the casting number for the following 3 engines: 1961 389, 1961 421, and a 1962 SD. IF the date code is for a '62 block, (at the distributor hole) it's a 421 SD. Pretty exiting stuff. Keep us posted. Is it for SALE?
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post #3 of 21 (permalink) Old 10-26-2012, 02:10 PM
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If it is a 4 bolt main and has a transfer lug it is a 61 or 62 421SD, the 389 will be a 2 bolt main and does not have a transfer lug. I believe they did not use letter codes in 61 and only used the casting number. Here is more 421 information with 62 letter codes, the letter code is on the front of the block, passenger's side just below the head;



389 and 400 blocks without transfer lug;



The 326, 350, 421, 428 and 455 blocks all have the transfer lug (except for the 1973 455SD);

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post #4 of 21 (permalink) Old 10-28-2012, 08:37 AM Thread Starter
 
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Thanks for info the motor also comes with tri power setup belived to be stock with motor picking up next week will know more
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post #5 of 21 (permalink) Old 10-28-2012, 11:31 AM
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Good deal. No matte what it is, ANY 4 bolt main '61-'62 block is a score. They are super strong, and have much more nickel and reinforcements than the later blocks. Only disadvantage is the trans mounted starter. I'm betting it's a 421 SD.....I can feel it!
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post #6 of 21 (permalink) Old 11-01-2012, 04:20 PM Thread Starter
 
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It is know in my possession head 538177 front passanger side block 861p top below 8110 their is also a E by itself at distrib k11 0 2 block 538181 help
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post #7 of 21 (permalink) Old 11-01-2012, 06:19 PM
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Originally Posted by mikey9743 View Post
It is know in my possession head 538177 front passanger side block 861p top below 8110 their is also a E by itself at distrib k11 0 2 block 538181 help
The 538177 head (1.88/1.60, 69 cc) was used on the standard 389 and 421 for both 61 and 62.

The SD heads for 61 and 62 was 540306 (1.92/1.66 68 cc).
In 62 the 405hp head was 544127 (2.02/1.76 68 cc)

Is there a transfer lug on the block?

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post #8 of 21 (permalink) Old 11-02-2012, 01:30 PM Thread Starter
 
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NO transfer lug on block
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post #9 of 21 (permalink) Old 11-02-2012, 03:05 PM Thread Starter
 
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also checked bore vener caliber 4-3/32 any help
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post #10 of 21 (permalink) Old 11-02-2012, 03:32 PM
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389 block

4.06250" bore, 3.7500" stroke & 3.000" main bearing diameter,

421 block

4.09375" bore, 4.0000" stroke & 3.250" main bearing diameter,


3/32 is equal to .09375, could also be a 389 with a .030 bore.

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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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