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Old March 20th, 2013, 12:52 PM
lynchee's Avatar
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Dennis Lynch
94 D90 #699
Join Date: Jun 2006
Location: Goffstown NH, USA
Posts: 609
4.2 cam suggestion

Anyone have a suggestion for a cam for a 4.2? We are going to rebuild the old one I have and want to give it a little more pep.

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Old March 20th, 2013, 01:46 PM
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1972 SIII
Join Date: Aug 2011
Location: Massachusetts
Posts: 693
I had the Piper 285 in a built up 4.6... big valve/ported heads, higher compression, etc.

It was definitely too much cam. Great power on the road, (really great) but I could never get it to idle right. It wasnt just lopey, it was mullet/camaro fire breathing lopey.

So my suggestion is, something less than a Piper 285. (or paint a trans am bird on the hood and go for it)

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Old March 20th, 2013, 03:57 PM
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Robbie Donaldson
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Robbie Donaldson
1995 Discovery
Join Date: Nov 2003
Location: Oak Hill, VA
Posts: 285
i have a Crower 50229 in my 4.2 rebuild. Feels like a perfect balance to me.
1995 Discovery
1995 RRC LWB
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Old March 20th, 2013, 04:21 PM
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Uncle Douglas
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Doug Crowther
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I had the piper 270 in a 3.9 I built. It was ok but I wouldn't recomend it as something that woke up that engine.
Good judgement comes from experience,experience comes from bad judgement.

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Old March 20th, 2013, 06:09 PM
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1995 SW #487/500
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Location: The Old North State
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I did a 229 in a 4.2, the engine was very tired at 223k. Did a complete top to bottom rebuild, I wish I would've used the 230. I was happy with the 230 in my RRC's 3.9.
Poor gas mileage gets you to the best places on earth
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