Quote:
Originally Posted by Frank Reiner
Tony H.:
Please recall the head gasket pics that you posted. There are five bolt holes that are slightly relocated for the aluminum block engines (the third row up from the lower edge of the head). That relocation is the result of those five bolts being angled by 1deg.,52min. from perpendicular to the block surface.
Those are also the bolts that pass thru and hold down the cam towers. There appears to be sufficient metal (in the heads of the aluminum block engines) available to re-drill those five holes at 90 deg. to match the iron blocks, if one were of a mind to do so.
Why were those bolts relocated? To shift the stress distribution at the top edge of the cylinder bore, in an effort to minimize distortion of the bore caused by tightening the bolts.
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Tony,
Above is the text of Post #32. It seems to me that there are two ways to approach the angled bolt situation: 1) redrill the 560 head at 90 deg. to match the iron block head, or 2) plug the bolt holes in the iron block, and drill and tap it at 1 deg. 52 min. to match the 560 heads.