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Old 04-04-06, 11:51PM   #1
598
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Location: New lenox,Il
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Default 538181 block

I have a 538181 block casting. Code is 11B. Under the 11B there is a C stamp. My dad has had it since 68 and used to dirt race it in 70. Standard bore, 4 bolt. He was told when he bought it that the block was a 389 SD but I see the codes say it isn't.

Can I bore this to a 421 and use standard 421 internals? Is the block worth more as a resto piece for someone(same side code as a 421 SD)?

In the 70's dad had the engine stuck in a early ford truck as a means of transportation. I have located a good body and was thinking about building it up for him as a suprise for his 65th birthday.


Thanks for any input,


Steve
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Old 04-05-06, 12:17AM   #2
tjs44
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you can bore it to 421 bore but a 421 crank wont fit without cutting the mains down and using a dude bearing kit.I is worth something to a person doing a 61-62 car.I takes a bellhouing mounted starter so a moden auto trans will take a adapter to work.Tom
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Old 04-05-06, 12:39AM   #3
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Looks like there is plenty of meat on the block to drill and tap for a block mounted starter. Anyone do this? Thanks for the input on the crank.

Thanks


Steve
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Old 04-05-06, 01:13AM   #4
tjs44
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there is not enough meat,been tried a ton of times.Have at it though.A 400 block that is betterTom is around 50-75 bucks,4 bolt caps installed is maybe $600.That block to the right guy might be worth $1000.You do the numbers.
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Old 04-06-06, 11:37PM   #5
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Default $1000

For a grand, I'd rather build my dads original engine. How do I find an acceptbale crank and/or full rebuild kit? I saw the Kanter kit but they have no crank. I have no core. How much is there to boring out the block centerline to a 421 crank, and can I find a good 421 crank? The heads need everything, so any suggestions as to parts there would be a help also. The six pac is early, as well as the heads, so I have to stay in that venue. Are there any early heads that are better as far as a street torque engine is concerned?


Thanks,


Steve
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Old 04-06-06, 11:43PM   #6
tjs44
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you would not bore the block for the 421 crank.You would cut the 421 crank to fit the 389 block.421 and 428 cranks come up for sale on ebay and this and other pontiac sitesRebuild kits are avail.Might call a pontiac rebuilder in your area and get some help.Tom
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Old 04-09-06, 10:32PM   #7
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Thanks tjs44. I figured to cut the crank. I was curious about how the block # was the same for the 421 S.D. , and kind of guessed they had used the same block but bored the mains larger. Can we pass that off as a freezer manhattan question? Are these chinese cranks as bad as they say? I,m not opposed to a 4.25 stroke, cast, low RPM engine for dad, as long as it would hold up. Torque is good. One more question, Are the rods the same for a 421 As a 389?


Thanks,


Steve
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Old 04-10-06, 03:47PM   #8
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389 and 421s use the same rod.Tom
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