400 sbc - Team Camaro Tech
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post #1 of 8 (permalink) Old Apr 18th, 04, 12:59 PM Thread Starter
 
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is a 400 sbc 3951509 2 bolt block a good block to build for a 68 camaro thanks
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post #2 of 8 (permalink) Old Apr 18th, 04, 04:12 PM
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Yes, a 509 2 bolt is probably the most sought after 400 block. Use it if it checks out at the machine shop. If it needs more than .030 over, sonic check it.

409SB, TH350, 12bolt 4.10<br />6.86 @ 98.8 on pump gas
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post #3 of 8 (permalink) Old Apr 18th, 04, 08:31 PM
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yep, as was said, a very good block. definately have it magnafluxed though. my first 400 block for my 406 build was a 509 block, but it had a hairline crack on the outside of the water jacket, it was very hard to even see.

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

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post #4 of 8 (permalink) Old Apr 18th, 04, 10:11 PM
 
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OK, I have a 2 bolt main 400sbc(not 509), but what are the differences and/or advantages(I'm dumb)?
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post #5 of 8 (permalink) Old Apr 19th, 04, 08:24 AM
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A 509 or 511 2 bolt are the favorite 400 blocks of most engine builders. Both blocks could also be found in the 4 bolt variety but it's been said that they are prone to cracking in the main webbing. With that said, I have used and am currently using 4 bolt blocks and have never had one crack. Your 2 bolt block is the prefered block and is plenty strong especially if ARP main studs are installed. Also to add to the castings above was a 817 that I believe was only available as a 2 bolt. I've personally never used one but I've heard that it is the weakest/thinnest of all 400 blocks and should be avoided if possible. But if I had one, I'd try it.

409SB, TH350, 12bolt 4.10<br />6.86 @ 98.8 on pump gas
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post #6 of 8 (permalink) Old Apr 19th, 04, 10:39 PM
 
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Thanks, for the info. My 400sbc block is a standard bore, 2bolt main "817". The motor is a mild fuel injected street motor, on pump gas, operating below 5500rpm. It is equipped with ARP main studs and rod bolts.
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post #7 of 8 (permalink) Old Apr 23rd, 04, 12:40 PM Thread Starter
 
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sorry for not getting back to u guys i really appreciate the info and i have one more question do the 509 blocks have steel cranks thanks
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post #8 of 8 (permalink) Old Apr 23rd, 04, 02:29 PM
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No, all factory 400 cranks are cast. But it'll be fine if machined correctly and balanced up to @ 450HP or so.

409SB, TH350, 12bolt 4.10<br />6.86 @ 98.8 on pump gas
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