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#1
07-24-2006, 07:29 AM
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Re: 427 engine..
"could be a L-88."....Cant be an L88 w 842s that late in production. Open chamber pistons wont mate to 842 heads and closed chambered L88s were long gone by Aug 69. The "leftover" head theory wouldnt apply as the matching closed chambered pistons would have to have been used in conjunction with the 842s also. The pistons cant be swapped out on those 2 aluminum head castings... Both motors used dimple rods so looking for them when dropping the pan wont tell you except the L88 had floating pin 7/16 and the L89s had 3/8 pressed pins dot rods . #7115 crank used in all production L88s,#6223 sometimes used but mostly the #7115 cranks used in L89s.
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Kevin 1970 Chevelle Droptop Period Correct Speed Parts 482 BBC, M22 or TH400? Day 2 Super Stock Rocks 
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#2
07-24-2006, 04:15 PM
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Re: 427 engine..
[ QUOTE ]
"could be a L-88."....Cant be an L88 w 842s that late in production. Open chamber pistons wont mate to 842 heads and closed chambered L88s were long gone by Aug 69. The "leftover" head theory wouldnt apply as the matching closed chambered pistons would have to have been used in conjunction with the 842s also. The pistons cant be swapped out on those 2 aluminum head castings... Both motors used dimple rods so looking for them when dropping the pan wont tell you except the L88 had floating pin 7/16 and the L89s had 3/8 pressed pins dot rods . #7115 crank used in all production L88s,#6223 sometimes used but mostly the #7115 cranks used in L89s. [/ QUOTE ] The Knowledge  on this site is beyond belief.........  Ken 
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 The Best things in life......Aren't Things
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#3
07-25-2006, 02:25 AM
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Re: 427 engine..
[ QUOTE ]
"could be a L-88.".... #7115 crank used in all production L88s,#6223 sometimes used but mostly the #7115 cranks used in L89s. [/ QUOTE ] Kevin, please elaborate on this point for me. Are you saying that 427 L/89's used '7115 cranks? Less the L-88 and ZL-1, I don't think any other production 427 engines got the '7115. As only the '842 heads separate the L/89 from the L/71, L/72, L/78 - how or why would the '7115 crankshaft replace the '6223 in production? I expect there could have been exceptions, but my research has indicated that the '7115 was super-special ( L-88 & ZL-1 ). Please correct me if I'm wrong.  Steve
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