grumpyvette Posted June 9, 2005 Share Posted June 9, 2005 thanks to CNC BLOCKS N/E This is a pic of a 454 block that has come in for some work as it only has about 3200 miles on it since the rebuild and it was making some lower end noises. We line honed it and squared and decked it flat and bored it and we blued up the 2 center cylinders installed the gasket and torque plate and went in for 6 strokes on each cylinder as you can see the results and look at the piston as it has blowby right to the oil controll rings as we could measure .003 distortion on the cylinders. notice the torque plate which simulates the stress on the block with the heads bolted on distorts the cylinder walls significantly, honeing without torque plates results in a cylinder surface thats not strait and round when the heads are bolted on. I have done blocks this way and gone trade shows and guys are amazed at what a torque plate does to a cylinder and on the after market blocks the distortion is minimal compared to the OEM stuff. The other side http://www.bhjinc.com/redirect/03HoningPlateApplications/Applications-PSHP1001.pdf Comments are welcome Quote Link to comment Share on other sites More sharing options...
hanomon Posted June 9, 2005 Share Posted June 9, 2005 So, what I get is that machining or cylinder honeing without a torque plate to simulate exactly where the block will be when the heads are on, can, may & or will cause deviation from true spec? This is some good info! Could a bore gauge help to reveal this condition prior to final assembly? Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted June 9, 2005 Author Share Posted June 9, 2005 "what I'm getting is that machining or cylinder honeing without a torque plate to simulate exactly where the block will be when the heads are on, can, may & or will cause deviation from true spec after final assembly?" yeah thats the IDEA! Quote Link to comment Share on other sites More sharing options...
DaleMX Posted June 10, 2005 Share Posted June 10, 2005 "Could a bore gauge help to reveal this condition prior to final assembly?" Not without the torque plates in place. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted June 10, 2005 Share Posted June 10, 2005 torqueing the mains also helps on OEM blocks. Quote Link to comment Share on other sites More sharing options...
BillZ260 Posted June 10, 2005 Share Posted June 10, 2005 "Could a bore gauge help to reveal this condition prior to final assembly?" Not without the torque plates in place. Makes sense, if you bore / hone the cyl walls with OUT a plate and measure them with OUT the plate you should measure perfect cyllindars. BUT once you torque up the heads and all that the cyl's warp and are not perfect as noted in the pics above. Great example Grummpy!! Quote Link to comment Share on other sites More sharing options...
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