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Old 10-22-2003, 11:23 AM
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yet another quench question

ok i have read many posts about this subject and the common answer which i am sure is the right one is deck the block and use the right thickness gasket but, why could we not mill the heads to achieve the same results?

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Old 10-22-2003, 11:53 AM
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milling

Because milling the head will not change the distance from the top of the piston to the head, unless you already had 0 deck height, in which case, you would just raise the cr. For example, if you had 020 deck height, and milled the head, you'd still have 020 height.
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Old 10-22-2003, 11:57 AM
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When setting the quinch distance, you are wanting to get the flat part of the piston to within approx .040 of the head surface

Milling the head won't do that. If the piston is down, lets say, .020 IN the bore, then you will need to mill the block down .020 to get the piston to the top of the block, ( often refered to as "0 deck height) where the head sets. Then, using a standard Felpro blue gasket, they will compress down to between .039 and .041. Then you put the head on and presto! All set.
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Old 10-22-2003, 12:07 PM
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ok thanks guys
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Old 10-22-2003, 01:46 PM
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Soory to spin off your post mineblown, what is this quench thing. I'm building a 327 over the course of a few years and I'm going to try to do the absolute best job I can. I work for a machine shop so I have all the indicators and such. But never heard of this quenching????
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Old 10-22-2003, 02:40 PM
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http://www.speedomotive.com/Building%20Tips.htm

this explains better than i can.
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Old 10-22-2003, 03:14 PM
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OK, thanks for the link. More questions for ya though. With a 0 deck height, and then the addition of a .040 or so gasket, How is that a close collision????? In my present state of mind this doesn't make any sence???????.....
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Old 10-22-2003, 06:47 PM
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Most performance builders don't like to get closer than .035 between the piston and head. Once things start to wear, plus expansion and then add some valve float at high rpms with old weaker springs, there is a possibility of valves hitting the pistons.
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Old 10-22-2003, 07:43 PM
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with the combo you talked about your quench would be .040 which is pretty much ideal. to get .035 you would need a .035 gasket, or would need to deck the block .005 below the piston top. but if you like to wring out the r's like i do this may be a little too close for comfort.
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Old 10-23-2003, 06:35 AM
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So with the 327, which is a higher reving motor , (6 to 7 redline) Zero decking it with a .040 gasket would be ideal? or would I like a little more??
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Old 10-23-2003, 09:42 AM
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the article in the link was written by someone smarter than me who said that a stock rod engine running 6500 rpm or less can use a .035 quench you should be fine at .040
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