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Old 12-30-2011, 04:44 PM
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piston question

are flat top pistons is really flat? Today i pull my 416 heads off my 305 to see flat pistons is this a average 305 block thanks

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Old 12-30-2011, 04:59 PM
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Some 305s came with flat top 4 valve relief pistons from the factory.
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Old 12-30-2011, 05:20 PM
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mines have 0 valve relief so is it plan flat top or dished pistons
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Old 12-30-2011, 05:35 PM
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Are you saying the piston if table-top flat with no valve reliefs?
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Old 12-30-2011, 06:12 PM
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yes table top flat but the outside edges a lil thicker
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Old 12-30-2011, 06:38 PM
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Quote:
Originally Posted by jmaine83
yes table top flat but the outside edges a lil thicker
Then it's not table-top flat, it's a dished piston. I don't care for those OEM pistons because of the lack of a suitable squish pad.
Here's a flat-top with valve reliefs....
http://www.google.com/imgres?hl=en&b...t:429,r:7,s:18
Here's a typical Chevy piston, two eyebrows and a dish. You can see that there is insufficient material to mate up with the underside of the cylinder head to create a good squish....
http://www.google.com/imgres?hl=en&g...t:429,r:15,s:0
Here's a flat-top with no valve reliefs, you buy them and cut your own valve reliefs depending on valve angle in the heads and valve lift....
http://www.kb-silvolite.com/kb_car/p...etails&P_id=50
Here's a KB dished piston. Note the generous squish pad on the left side of the photo that mates up with the underside of the cylinder head...
http://www.kb-silvolite.com/kb_car/p...tails&P_id=154

Last edited by techinspector1; 12-30-2011 at 06:47 PM.
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Old 12-30-2011, 07:18 PM
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thanks tech 1
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Old 12-30-2011, 07:45 PM
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So which do you have?
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Old 01-01-2012, 01:12 AM
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So which do you have?
He has apparently decided to resist disclosure of that particular information.
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