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Unread 04-14-2004, 05:52 PM   #1
karter74
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Join Date: Apr 2004
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Hypereutectic -vs- Cast Pistons

Hey guys, I need some help on deciding what pistons to use on my rebuild of my 87 XJ. I don't plan on stroking it due to my inability to find a 4.2 crank and rods (if you know where I can find some, please tell me!) so I want to go ahead and just do a small build up of the 4.0. Right now my current plans are getting either the Sealed Power 677P or the Hypereutectic pistons of the same. I will be boring the engine .030" over and putting in either Crane Cams 753901 or 750501 (can't decide, since I'm not stroking the engine, what cam is good for me?) I hear good/bad things of the Hypereutectic pistons, saying they are stronger, yet more brittle to higher performance. Which should I use to rebuild the engine, Hypereutectic or the normal cast? Thanks!

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Unread 04-15-2004, 09:49 AM   #2
MudMonster
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Join Date: Jan 2003
Location: Ft. Mitchell, KY
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Quote:
Originally Posted by karter74
Hey guys, I need some help on deciding what pistons to use on my rebuild of my 87 XJ. I don't plan on stroking it due to my inability to find a 4.2 crank and rods (if you know where I can find some, please tell me!) so I want to go ahead and just do a small build up of the 4.0. Right now my current plans are getting either the Sealed Power 677P or the Hypereutectic pistons of the same. I will be boring the engine .030" over and putting in either Crane Cams 753901 or 750501 (can't decide, since I'm not stroking the engine, what cam is good for me?) I hear good/bad things of the Hypereutectic pistons, saying they are stronger, yet more brittle to higher performance. Which should I use to rebuild the engine, Hypereutectic or the normal cast? Thanks!
PM Mudlover to ask about the crank
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Unread 04-16-2004, 07:34 AM   #3
KAKERS
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Join Date: Mar 2004
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Quote:
Originally Posted by karter74
Hey guys, I need some help on deciding what pistons to use on my rebuild of my 87 XJ. I don't plan on stroking it due to my inability to find a 4.2 crank and rods (if you know where I can find some, please tell me!) so I want to go ahead and just do a small build up of the 4.0. Right now my current plans are getting either the Sealed Power 677P or the Hypereutectic pistons of the same. I will be boring the engine .030" over and putting in either Crane Cams 753901 or 750501 (can't decide, since I'm not stroking the engine, what cam is good for me?) I hear good/bad things of the Hypereutectic pistons, saying they are stronger, yet more brittle to higher performance. Which should I use to rebuild the engine, Hypereutectic or the normal cast? Thanks!
The Hypereutectic are a good choice for moderate, naturally aspirated performance applications. They are generally considered a compromise between the strength of a forged, and the thermal stability & lightness of a cast piston. For a run-of-the-mill 4.0, whether stroked or not, they are overkill. Go with the cast, you won't be disappointed. Should be cheaper too.

For the 4.2 crank/rods try Hesco in Birmingham AL. They sell 4.0 stroker kits and will definitely have access to the crank/rods/pistons you're looking for. Good luck.
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