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KB pistons and I did some measuring #579199 01/10/10 10:43 PM 01/10/10 10:43 PM
Joined: Mar 2008 Posts: 724 PA USA F flatiron OP super stock
flatiron OP super stock F Joined: Mar 2008 Posts: 724 PA USA	The engine is a stock 1979 360 stock crank and rods. I steam cleaned it and did some measuring centerline of crank to bank measure's 9.601 , The bores measure as follows 1 4.001-4.002 2 4.001-4.0015 3 4.0015-4.003 4 4.001 - 4.0035 5 4.002- 4.0035 6 4.002-4.0035 7 4.002-4.0035 8 4.0015-4.003 I was very surprised how constant all the bores were for having 80k miles now my questions. 1 I'm interested in using STD KB191'S does anyone know if they are oversize enough that I can just have these cylinders honed? 2. With the Kb191 it states head milling my be required does this mean the quench area of the combustion chamber of the head? I am building a strictly strip engine for my 72 Dart nothing crazy just what I want to be a good running engine on a budget and I can go any direction because all I have at this time is the block,crank,rods and 596or 915 heads with nothing done tp them

Re: KB pistons and I did some measuring [Re: flatiron] #579200 01/10/10 10:54 PM 01/10/10 10:54 PM
Joined: Dec 2007 Posts: 77 British Columbia Canada Challenger340 member
Challenger340 member Joined: Dec 2007 Posts: 77 British Columbia Canada	You say 80K on the Engine ? I'd be more concerned with "where" the ridge is, so that the new Pistons/Rings aren't trying to run over it ? Better to be a "has been" than a "never was".

Re: KB pistons and I did some measuring [Re: Challenger340] #579201 01/10/10 11:09 PM 01/10/10 11:09 PM
Joined: Feb 2007 Posts: 1,025 Las Vegas, NV dodgeboy11 super stock
dodgeboy11 super stock Joined: Feb 2007 Posts: 1,025 Las Vegas, NV	The question you should be asking yourself is, if the bores were good enough to run before, why'd you tear it apart? I'd re-ring it and use the stock pistons. If you're going to go to the expense of putting pistons in it, then have it bored to the next available size that the bores will clean up at. Prolly a .020 or .030.

Re: KB pistons and I did some measuring [Re: flatiron] #579202 01/10/10 11:18 PM 01/10/10 11:18 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	With 80k you should have the block bored to true the cylinders

Re: KB pistons and I did some measuring [Re: dodgeboy11] #579203 01/10/10 11:30 PM 01/10/10 11:30 PM
Joined: Mar 2008 Posts: 724 PA USA F flatiron OP super stock
flatiron OP super stock F Joined: Mar 2008 Posts: 724 PA USA	Quote: The question you should be asking yourself is, if the bores were good enough to run before, why'd you tear it apart? I'd re-ring it and use the stock pistons. If you're going to go to the expense of putting pistons in it, then have it bored to the next available size that the bores will clean up at. Prolly a .020 or .030. I tore it apart for a few reason's to replace the 318 I now have,to up the compression and I've never built a engine

Re: KB pistons and I did some measuring [Re: flatiron] #579204 01/10/10 11:39 PM 01/10/10 11:39 PM
Joined: Jan 2003 Posts: 1,072 The Sunny Shuswap D dodgefarmer super stock
dodgefarmer super stock D Joined: Jan 2003 Posts: 1,072 The Sunny Shuswap	9.601" on all 4 corners? Randy

Re: KB pistons and I did some measuring [Re: dodgefarmer] #579205 01/11/10 12:06 AM 01/11/10 12:06 AM
Joined: Mar 2008 Posts: 724 PA USA F flatiron OP super stock
flatiron OP super stock F Joined: Mar 2008 Posts: 724 PA USA	I only checked the front and it was within .01 from side to side

Re: KB pistons and I did some measuring [Re: flatiron] #579206 01/11/10 02:09 AM 01/11/10 02:09 AM
Joined: Feb 2007 Posts: 1,025 Las Vegas, NV dodgeboy11 super stock
dodgeboy11 super stock Joined: Feb 2007 Posts: 1,025 Las Vegas, NV	Quote: I tore it apart for a few reason's to replace the 318 I now have,to up the compression and I've never built a engine Ahh, I understand now. I'd still have it bored. If you've never built an engine, don't make things difficult on yourself. Get it machined and things will go so much better for you.

Re: KB pistons and I did some measuring [Re: flatiron] #579207 01/11/10 06:44 AM 01/11/10 06:44 AM
Joined: Jan 2003 Posts: 75,012 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,012 U.S.S.A.	Quote: I only checked the front and it was within .01 from side to side .01 ??? that would mean one side was 9.601 and the other was either 9.611 or 9.591 , thats a HUGE descrepency Bore and square decking are in that block near future . The pistons will not be oversize enough for you to hone out the cylinders straight and round again , bore clearance is built into the piston .

Re: KB pistons and I did some measuring [Re: JohnRR] #579208 01/11/10 12:16 PM 01/11/10 12:16 PM
Joined: Mar 2008 Posts: 724 PA USA F flatiron OP super stock
flatiron OP super stock F Joined: Mar 2008 Posts: 724 PA USA	Quote: Quote: I only checked the front and it was within .01 from side to side .01 ??? that would mean one side was 9.601 and the other was either 9.611 or 9.591 , thats a HUGE descrepency Bore and square decking are in that block near future . The pistons will not be oversize enough for you to hone out the cylinders straight and round again , bore clearance is built into the piston . Was looking at my notes the crank to bank measurement was 9.601 on the left and 9.599 on the right

Re: KB pistons and I did some measuring [Re: flatiron] #579209 01/11/10 06:56 PM 01/11/10 06:56 PM
Joined: Jan 2003 Posts: 75,012 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,012 U.S.S.A.	Quote: Quote: Quote: I only checked the front and it was within .01 from side to side .01 ??? that would mean one side was 9.601 and the other was either 9.611 or 9.591 , thats a HUGE descrepency Bore and square decking are in that block near future . The pistons will not be oversize enough for you to hone out the cylinders straight and round again , bore clearance is built into the piston . Was looking at my notes the crank to bank measurement was 9.601 on the left and 9.599 on the right did you check from to back both sides ?

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