Block deck height
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Everyone seems all flustered when you ask them to measure the block deck height on a small block Chevy. The only tools you need are a 12" dial caliper and a pencil and paper. The last 12" caliper I bought was from an ebay auction and I paid 80 bucks for a quality Mitutoyo. | Everyone seems all flustered when you ask them to measure the block deck height on a small block Chevy. The only tools you need are a 12" dial caliper and a pencil and paper. The last 12" caliper I bought was from an ebay auction and I paid 80 bucks for a quality Mitutoyo. | ||
| − | The main bearing bore (less bearings, but with caps snugged down) on a small block Chevy is 2.641". If we divide that by 2, we find that the radius of the main bearing bore is 1.3205". There is room to slide a 12" dial caliper down into the bore of #1, #7, #2 and #8 and snag one end of the caliper jaw on the edge of the main saddle, with the other jaw on the block deck at the edge of the cylinder. Measuring a stock block in this manner might give you a reading of 7.7045". Adding the main bearing bore radius to that figure results in a stock 9.025" block deck height. (7.7045" plus 1.3205" equals 9.025") | + | The main bearing bore (less bearings, but with caps snugged down) on a small block Chevy 350 is 2.641". If we divide that by 2, we find that the radius of the main bearing bore is 1.3205". There is room to slide a 12" dial caliper down into the bore of #1, #7, #2 and #8 and snag one end of the caliper jaw on the edge of the main saddle, with the other jaw on the block deck at the edge of the cylinder. Measuring a stock block in this manner might give you a reading of 7.7045". Adding the main bearing bore radius to that figure results in a stock 9.025" block deck height. (7.7045" plus 1.3205" equals 9.025") |
If you have an engine other than a small block Chevy, you will have to research and find the main bearing bore of the motor or snug a cap onto the saddle without a bearing and measure the diameter with your caliper, then cut that figure in half for the radius. | If you have an engine other than a small block Chevy, you will have to research and find the main bearing bore of the motor or snug a cap onto the saddle without a bearing and measure the diameter with your caliper, then cut that figure in half for the radius. | ||
[[Category:Engine]] | [[Category:Engine]] | ||
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