pistons
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New User
Joined: Jul 2005
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pistons
hi,
for a 351w only bored .030 over, with none of the surfaces milled what would be a good hypereutectic piston to get the motor to about 10:1 compression ratio? it has a stock crankshaft and eagle forged I beam rods with a length of 5.956". i am using D0OE heads with a chamber volume of 60.4 cc. also would porting and a 3 angle valve job and increase to 2.020/1.60 valves make any difference in the compression ratio? i have a comp cams xtreme energy cam with duration @.050 = 250/256 and .554/.558 lift. is this a bad set up for a truck looking to go fast? its for an 87 ranger, so it wont be used for any real work.
thanks.
for a 351w only bored .030 over, with none of the surfaces milled what would be a good hypereutectic piston to get the motor to about 10:1 compression ratio? it has a stock crankshaft and eagle forged I beam rods with a length of 5.956". i am using D0OE heads with a chamber volume of 60.4 cc. also would porting and a 3 angle valve job and increase to 2.020/1.60 valves make any difference in the compression ratio? i have a comp cams xtreme energy cam with duration @.050 = 250/256 and .554/.558 lift. is this a bad set up for a truck looking to go fast? its for an 87 ranger, so it wont be used for any real work.
thanks.
Senior User
Joined: Nov 2004
Posts: 166
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From: Tucson, AZ
keith black KB-379. check out flatlander racings web site or united engine and machine who makes keith black pistons. approx. 9.8:1 w/ 60cc chambers for the kb-379 flat tops. ask a machinist in your area about valve size effects on compression ratio. not all pistons are cut with enough valve relief for 2.02 intakes. make sure you check clearances or buy pistons with larger relief.
je's, srp's and others are cut with enough relief, but they are forged, but @ 10:1 you might think about buying forged for the clearance and peace of mind. i paid $125 to have mine flycut after installing 1.94 intake valves using stock replacement pistons in a 5.0 HO. luckily i didn't bend any valves. cheers, garsten
je's, srp's and others are cut with enough relief, but they are forged, but @ 10:1 you might think about buying forged for the clearance and peace of mind. i paid $125 to have mine flycut after installing 1.94 intake valves using stock replacement pistons in a 5.0 HO. luckily i didn't bend any valves. cheers, garsten
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New User
Joined: Jul 2005
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hi, thanks for the help. i think i might go with kb303's (9.3:1, hypereutectics), id rather not spend the extra money on a forged set since its only going to be used on the street as more of a daily driver. ive got other projects that id be better off spending the extra money on.
