Do yourself a favor and cut the block.
.120" on the head will get you 34 CC if you are at 54 now.
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| Can a 68 model head take .171" cut? https://www.slantsix.org/forum/viewtopic.php?t=44647 |
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| Author: | drgonzo [ Thu Apr 21, 2011 11:36 am ] |
| Post subject: | Can a 68 model head take .171" cut? |
Is that pushing it? .171" flat cut? |
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| Author: | polkat [ Thu Apr 21, 2011 2:22 pm ] |
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Yep! Too much. That's not all that much less then 1/5 of an inch, and would probably weaken the head too much. Most limit it to .090" (just over half of .171"), although I've heard .100" (and slightly more) is possible. Sounds like you are trying to acheive a closed chamber...yes? ________ LIVE SEXY CAMS |
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| Author: | Dart270 [ Thu Apr 21, 2011 2:47 pm ] |
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Are you looking for 11 or 12:1 compression? It may be OK, but that's probably pushing it. I have done 0.110" on manifold side and 0.210" on plug side successfully. Lou |
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| Author: | drgonzo [ Thu Apr 21, 2011 5:24 pm ] |
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Nope I am looking for 10.5:1 with the pistons down in the hole .183" |
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| Author: | drgonzo [ Thu Apr 21, 2011 5:26 pm ] |
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Here is the deal. The head has already been cut It seems as the chambers are 54cc. I want to cut another .130 or so to get a 34cc chamber and 10.5:1 with a .18375 deck height. Pistons -.18375 in the hole .041 head gasket 3.51 diametier 3.46 bore 4.124 stroke 65 (with the 15 added) intake closing point. My calculations say I need about a 34cc chamber. What say ye? |
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| Author: | slantzilla [ Thu Apr 21, 2011 7:10 pm ] |
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Do yourself a favor and cut the block. .120" on the head will get you 34 CC if you are at 54 now.
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| Author: | 1974duster kev [ Thu Apr 21, 2011 9:18 pm ] |
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I've cut .100 off my daily driver Kev |
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| Author: | emsvitil [ Thu Apr 21, 2011 9:33 pm ] |
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You need to take some off the block.......... |
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| Author: | ceej [ Thu Apr 21, 2011 9:38 pm ] |
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Cut the deck. I cut mine 0.120" This was for my particular build, so do the math for yours. You won't have to cut it as far as I chose to. This leaves lots of meat in the head to try to keep the valves away from the bores. Still plenty of holding power for the head studs/bolts. If you run oversize valves, you may have to relieve the bores to avoid interference. By not cutting the head, you keep them further away and minimize the possibility of putting a valve into the deck at the edge of a bore. Check any head and block prior to assembly to make sure the combustion chamber is alligned over the bores. Bolt it to the block while the Reciprocating assembly is out, and turn it over to see. Adjust as necessary with offset dowels. I had an engine bend some shiny new valves due to missalignment. CJ |
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| Author: | edd jesiolowski [ Thu Apr 21, 2011 10:23 pm ] |
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I cut.170 off the head and .135 off the block i o.ring the block and run a copper head gasket |
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| Author: | drgonzo [ Fri Apr 22, 2011 6:56 am ] |
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Edd PM sent. |
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| Author: | Dart270 [ Sat Apr 23, 2011 6:46 am ] |
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At 54cc's it may not have been cut. I would just cut 0.120" off the head and have about 10:1 comp. No reason to shoot for a higher number and risk the head on a street car. 10:1 will be a big bump up and you will like it. Then, when you want to pull the shortblock apart, you can cut the block to get whatever comp you like. Lou |
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