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[GMCnet] Interesting note on the 403 piston bore size [message #336547]

Thu, 30 August 2018 23:22

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

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On the top of the main block. Next to each cylinder bore hole. GM stamped a letter code as to the bore size of that cylinder. The 403 was Olds first use of Siamese cylinder blocks. ( No water could pass between the adjoining cylinders.) They may have been concerned about cylinder expansion. I don't know. Chevy did the Siamese design with their small block 400 at the same time as Olds did. Chevy also had a big block 400. That didn't have the Siamese cylinders. Bob Dunahugh
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[Message index]

		[GMCnet] Interesting note on the 403 piston bore size By: BobDunahugh on Thu, 30 August 2018 23:22
		Re: [GMCnet] Interesting note on the 403 piston bore size By: Chris Tyler on Fri, 31 August 2018 07:02
		Re: [GMCnet] Interesting note on the 403 piston bore size By: JohnL455 on Fri, 31 August 2018 09:40
		Re: [GMCnet] Interesting note on the 403 piston bore size By: JohnL455 on Fri, 31 August 2018 09:41
		Re: [GMCnet] Interesting note on the 403 piston bore size By: jhbridges on Fri, 31 August 2018 12:51
		Re: [GMCnet] Interesting note on the 403 piston bore size By: C Boyd on Fri, 31 August 2018 15:23
		Re: [GMCnet] Interesting note on the 403 piston bore size By: Rob on Fri, 31 August 2018 16:16
		Re: [GMCnet] Interesting note on the 403 piston bore size By: James Hupy on Fri, 31 August 2018 17:38
		Re: [GMCnet] Interesting note on the 403 piston bore size By: Matt Colie on Fri, 31 August 2018 14:05
		Re: [GMCnet] Interesting note on the 403 piston bore size By: BobDunahugh on Fri, 31 August 2018 22:51
		Re: [GMCnet] Interesting note on the 403 piston bore size By: BobDunahugh on Fri, 31 August 2018 23:22
		Re: [GMCnet] Interesting note on the 403 piston bore size By: Rob on Sat, 01 September 2018 06:21
		Re: [GMCnet] Interesting note on the 403 piston bore size By: James Hupy on Sat, 01 September 2018 09:33
		Re: [GMCnet] Interesting note on the 403 piston bore size By: jhbridges on Sun, 02 September 2018 14:46

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