over sized valves and cam upgrade
#1
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over sized valves and cam upgrade
i bought a head for my 90 pickup cause it was a steal of a deal i couldnt pass it up. it has over sized valves im thinking of putting a cam in it im not sure what to get. im looking for power between 2000 and 4000 rpms. i just need some help finding a good cam. please help me!!
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I had over sized valves, a header and a flomaster 40 series muffler with 2 1/4" pipe the whole way and no cat and the 267 cam and did not like it. Not enough off the line and I had to be at too high of an rpm when going up hills....the powerband with only 125ish ponies was too high in my opinion. 261 all the way
#5
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I have the 261C and i redline my truck all day. i love it. never seems to drop off. power doesn't seem to come into play until mid range tho. ok with me, but maybe not you.
Last edited by Erik Beeman; 03-05-2010 at 12:53 AM.
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I have the 261c now and the power falls off a cliff at 4500rpm. I now have on a stand a 30 over 22re with EB's rv head and the new 270 cam. I like to let my truck rev and the 261 just doesn't do that, it's a crawler cam.
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#10
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#12
I have EB's performance head with oversize valves and 268 cam. Runs great and i still have the stock exhaust all the way to the tail pipe that will be upgraded to a 2" in the near future so i hopefully i will see some more gains. I have to run 89 octane in mine as it slightly pings with 87. No noticeable pinging with the 89 and was very, very slight on 87 but bugged me none the less.
#13
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I have EB's performance head with oversize valves and 268 cam. Runs great and i still have the stock exhaust all the way to the tail pipe that will be upgraded to a 2" in the near future so i hopefully i will see some more gains. I have to run 89 octane in mine as it slightly pings with 87. No noticeable pinging with the 89 and was very, very slight on 87 but bugged me none the less.
#14
I run factory specs, 5 deg with the connector jumped. I have tried running less than 5 deg but wasnt happy with the performance so i stick with 5deg and 89 fuel. I live in Ca so it may be something to do with our fuel, who knows
#15
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guys, olharly, lary, thanks for the info! has anyone ever tried EB's 270/430? The info I got from Ted was that its the MOST performance overall with a stock setup, just wondering if anyone has had a chance to play around with the torque ranges it offers
#16
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I set mine up for 9 deg advanced with 89 octane- just for kicks I gave it a full tank of 87 octane, there may be a few factors like winter fuel and cold temp- but no ping and the power seems similar.
#18
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I have mine at 8 degree's advance but not to go past 10 degrees by TED
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