Minimum cylinder wall thickness??? - Team Camaro Tech
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post #1 of 5 (permalink) Old Jan 26th, 04, 11:51 AM Thread Starter
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Join Date: Mar 2000
Location: Mesa, AZ
Posts: 744

I want to have my SB400 bored .060. Before I go have it sonic checked, and hear their opinion, i'd like to hear your opinions on minimum cylinder wall thickness. Approx 525-550 HP, no N2O, 6700 max rpm. 95% drag race. I plan to fill the block, short fill. Thanks.


67 Camaro 10.71@125.76mph, 6.80@100.48, 1.455 60ft 421sbc
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post #2 of 5 (permalink) Old Jan 26th, 04, 12:08 PM
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post #3 of 5 (permalink) Old Jan 28th, 04, 04:39 PM
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Lonnie67, Depends on how heavy a piston you use, as heavy pistons tend to beat the walls around a lot. Do you HAVE TO bore it to 060? A 030 bore ( 4.155 ) is a safer bet, probably will make as much or more power due too less cylinder wall flexing ( can you say ring seal? ), you are only sacrificing 6 C.I. at 4.155. I personally do not like too see less than .205 wall thickness finished machined. This is almost impossible with a production block, unless you have a lot of blocks too test. I also run a production 400 block in my race car, I sonic checked 23 blocks until i found a suitable block. Actually ended up with a fairly nice thick block with a finished size of .230 average. Dont necesarily count out the block if there is a variance around the bore. Dont forget about engine crank rotation, as it places more load on the walls on the thrust side. Hope this helps. P.S. My stuff made 735 on the Dyno. All Motor.

2002 Jerry Bickle Cavalier, 446" Small Block, Brodix Canted Valve, lenco 5 speed, 7.54 @ 180. mph,1.06 60', 2235 lbs for 2014. GM Canada Docs, Highly Optioned 69 RSZ28 , Hugger Orange, White Stripes, 42,000 mile survivor, owned since 1973.
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post #4 of 5 (permalink) Old Jan 30th, 04, 05:06 PM
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Location: rapids city,Il
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Hey the block you have is .060 over, if you don't want to build it for racing I have a Bowtie Block that is a 400. The bore is 4.125 and it has a fresh bore and hone. it also has the bronze lifter bore. It is a sweet block, but I am switching to big block and selling all small block stuff that I got. If you want to know more about it email me or call. Email address is or phone is (309)496-2214. This is a true bowtie and not a fake.
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post #5 of 5 (permalink) Old Jan 31st, 04, 07:04 PM Thread Starter
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Location: Mesa, AZ
Posts: 744

rszmjt, it is already .040 and wasn't done with torque plates. It does have some blow by. It does run about 5 degrees cooler than my .060 over 383 with identical cooling systems, even when it's 110 out. Neither run hot.

67 Camaro 10.71@125.76mph, 6.80@100.48, 1.455 60ft 421sbc
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