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#63087 07/21/2006 10:41 PM | Joined: Sep 2004 Posts: 46 Member | | Member Joined: Sep 2004 Posts: 46 | Was commenting to a friend the other day that I had my 325 bored to 60 thousands and the 848 head shaved 40, he cringed in horror & said that sounded like too much to him. Is it too much or will it be ok? | | |
#63088 07/21/2006 10:50 PM | Joined: Sep 2004 Posts: 46 Member | | Member Joined: Sep 2004 Posts: 46 | oops...I mean my 235..dyslexia you know. | | |
#63089 07/21/2006 11:17 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | It,s not too much on these old castings. They had a lot of meat on them. The late model stuff with thin wall castings it would be too much.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#63090 07/22/2006 12:30 AM | Joined: Mar 2000 Posts: 784 'Bolter | | 'Bolter Joined: Mar 2000 Posts: 784 | I've done the same thing to my motor, with no problems. One thing you might want to check is that the valves aren't going to hit the pistons. I had 50 taken off my head and the valves recessed the same amount. I'm not sure it was necessary but not knowing any better I had it done anyway. | | |
#63091 07/22/2006 12:32 AM | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | Shoot, .0060 is just a clean-up bore job....... 
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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#63092 07/22/2006 12:48 AM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Tiny, .060.....not .006. You been sniffing glue again? Stuart | | |
#63093 07/22/2006 1:19 AM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | .060" isn't a problem on the 235. My machine shop did tell me that you shouln't go much farther then that, however.
Bill Burmeister
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#63094 07/22/2006 4:06 AM | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | 235's have been successfully bored up to .125 but certainly that is not a recommended practice. It would suffer from overheating if in fact one didn't bore right through the jacket. | | |
#63095 07/22/2006 12:22 PM | Joined: Jun 2006 Posts: 96 Member | | Member Joined: Jun 2006 Posts: 96 | 40 and 50 off the head... are you guys still able to run regular unleaded? | | |
#63096 07/22/2006 1:05 PM | Joined: Sep 2004 Posts: 46 Member | | Member Joined: Sep 2004 Posts: 46 | Don't yet know about the gas..My engine is still on the stand. BTW..Leon, I had several Volvos..122s' PV-544s' & P210 Duett. Great little autos. | | |
#63097 07/22/2006 5:08 PM | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | Originally posted by atomarc: Tiny,
.060.....not .006. You been sniffing glue again?
Stuart A pause while the kleenex is used....what do you mean? Glue? Nope, I put a lot of things up my nose as a young fellow but glue wasn't one of them.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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#63098 07/22/2006 5:46 PM | Joined: Jun 2005 Posts: 887 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 887 | Two suggestions with regard to the head and block milling/decking: FIRST: Before you bolt everything together it would be worth the effort to measure the combustion chamber so you can calculate your compression ratio. I milled 50 off the head and 50 off the block in my 261 and wish I'd measured everything before I put it together. Once you know the compression ratio you'll know if you need high test or can get by on regular unleaded. Here's an article with the basics. http://www.circletrack.com/techarticles/ctrp_0505_comp_ratio/ SECOND: Put some modelling clay on the piston tops where the valves will contact, if they're gonna hit, 1/8" should be enough. Measure the height of the clay. Put the cylinder head on, push rods and lifters in and tighten a couple of bolts and then turn the crank pulley enough for the cylinder(s) you've put the clay in cycle through. Pull the head and check the clay. That'll tell you if your valves will hit the pistons. If they do, you can have the valves recessed in the head and shorten the stems.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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