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Quench on a 340. #1219375 04/20/12 10:48 PM 04/20/12 10:48 PM
Joined: Apr 2012 Posts: 9 walton ny W woody30 OP member
woody30 OP member W Joined: Apr 2012 Posts: 9 walton ny	Maybe I'm not the sharpest pencil in the box but how do you get a .035-.040 quench out of a 340 with the piston .018 out of the bore?? Even with a .040 head gasket you're only at .022. That's not even considering milling the deck or heads. Are the heads on a 340 made special so this is possible?

Re: Quench on a 340. [Re: woody30] #1219376 04/20/12 11:39 PM 04/20/12 11:39 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	You'd need a thicker composite gasket like the blue Felpro's. Not sure what the thickness of the FP blue SB ones are (might be .054") live every 24 hour block of time like it's your last day on earth

Re: Quench on a 340. [Re: woody30] #1219377 04/20/12 11:41 PM 04/20/12 11:41 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum master
471Magnum master Joined: Jan 2003 Posts: 3,719 Space Station #5	[edit} my bad Last edited by 471Magnum; 04/21/12 10:50 AM. -Jim I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it. Currently Mopar-less

Re: Quench on a 340. [Re: 471Magnum] #1219378 04/20/12 11:58 PM 04/20/12 11:58 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Quote: Can't run a closed chambered head with the OEM high compression/domed piston. Need after market flat tops. Edelbrock does make a version of the performer head for a stock type 340 piston. Not sure if it can be set-up for effective quench though. That's just bad info for anyone that reads this. The stock OEM 340 piston is a flat top with valve reliefs. I guess mine with closed chambers and flat top pistons out of the hole .022 is gonna blow up? As mentioned, you just need a gasket the correct compressed thickness. Those ede 340 open chamber heads are junk for building a quench engine. Makes things MUCH tougher. All the 340 sets I've had, the chamber gets cut off them so they become closed chamber! no guessing, reflector domes, none of that nonsense. Easier to build and measure with a flat surface

Re: Quench on a 340. [Re: woody30] #1219379 04/21/12 10:40 AM 04/21/12 10:40 AM
Joined: Jun 2004 Posts: 1,629 wilmington,ohio O ohiodemon top fuel
ohiodemon top fuel O Joined: Jun 2004 Posts: 1,629 wilmington,ohio	obtaining quench is going to require some sharp measuring and also possible head/block machining. it's not done simply.

Re: Quench on a 340. [Re: woody30] #1219380 04/21/12 11:08 AM 04/21/12 11:08 AM
Joined: May 2004 Posts: 4,920 Joplin, MO USA Robbins master
Robbins master Joined: May 2004 Posts: 4,920 Joplin, MO USA	Quote: Maybe I'm not the sharpest pencil in the box but how do you get a .035-.040 quench out of a 340 with the piston .018 out of the bore?? Even with a .040 head gasket you're only at .022. That's not even considering milling the deck or heads. Are the heads on a 340 made special so this is possible? If the short block is together then like said run a thicker gasket.....if not then I machined my pistons tops to zero deck on mine. Moparlee

Re: Quench on a 340. [Re: ohiodemon] #1219381 04/21/12 11:13 AM 04/21/12 11:13 AM
Joined: Jul 2003 Posts: 6,167 Maryland GO_Fish master
GO_Fish master Joined: Jul 2003 Posts: 6,167 Maryland	stock 340 heads are open chamber and not designed for quench. They would need a lot of machining to create a quench pad, and then (as with a closed chamber aftermarket or magnum head) you would need the thick head gaskets as noted since stock 340 flat top pistons stick above deck. Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph

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