The blocks .060 over and the heads been milled .030. The 2 1/4 exhaust will be fine, I have 2 1/4, but the way this cam makes the engine breath at higher rpm, I wonder if a slighlt bigger exhaust would help.
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| Sorry for My Ignorance (Head & Cam Question) https://www.slantsix.org/forum/viewtopic.php?t=53352 |
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| Author: | ValiantBoyWonder [ Thu Sep 19, 2013 7:41 pm ] |
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Joe, I run the howards 752002-10 cam in my super six 225. You'll need to upgrade the exhaust pipe to 2 1/2". This cam has some overlap, but it idles decent. It really breathes aand punches on the freeway around 2500rpm. |
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| Author: | Chuck Valiant [ Sat Sep 21, 2013 3:54 pm ] |
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Quote: Joe,
Thanks VBW. Did you have any work done on the head or block?I run the howards 752002-10 cam in my super six 225. You'll need to upgrade the exhaust pipe to 2 1/2". This cam has some overlap, but it idles decent. It really breathes aand punches on the freeway around 2500rpm. So are you saying that 2-1/4 exhaust wont be enough? |
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| Author: | ValiantBoyWonder [ Sun Sep 22, 2013 9:47 am ] |
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The blocks .060 over and the heads been milled .030. The 2 1/4 exhaust will be fine, I have 2 1/4, but the way this cam makes the engine breath at higher rpm, I wonder if a slighlt bigger exhaust would help.
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| Author: | ceej [ Sun Sep 22, 2013 9:47 am ] |
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Going bigger than 2-1/4" isn't going to be necessary for most uses I can imagine with that cam. It's pretty mild. CJ |
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| Author: | Chuck Valiant [ Mon Sep 23, 2013 6:02 pm ] |
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What do you think of this cam grind? 
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| Author: | DusterIdiot [ Mon Sep 23, 2013 7:03 pm ] |
| Post subject: | 346 vs. 791 |
Once you start into the "230" @.050 the cam will be a little lumpy and will want to make power at a little higher rpm, to band-aid this you will also have to bring up the compression...(That cam would work great with about 10:1 SCR and a manual transmission, or the proper stall convertor and a kinder rear ratio...to make it "behave" better on the street/automatic tranny you may have to move the LSA to something closer to a 110-111). -D.Idiot |
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| Author: | Joshie225 [ Mon Sep 23, 2013 7:10 pm ] |
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And making it behave that way is the wrong way to go. You are miles ahead by reducing the overlap through a reduction in duration than by spreading the lobes apart. With stock size valves you really want about a 106° lobe centerline for best torque and power. If you want it to idle better then reduce the duration. |
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| Author: | Chuck Valiant [ Mon Sep 23, 2013 7:41 pm ] |
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As soon as I find a machinist that is willing to do the job, I will definitely have the valves enlarged and the pockets ported. The reason I was thinking the #345 grind over the #791 is because I read somewhere that Doc recommends having the exhaust lift a little less than the intake. Like I said before, I really don’t know what these numbers mean. Sorry for my ignorance, I just know I want to go fast when I want to go fast. That’s my idea of a fun little cruiser, a slant 6 sleeper. |
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| Author: | robertob [ Tue Sep 24, 2013 10:06 am ] |
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A number of people on here have used that cam and I don't know if they are happy with it or not... I am using a similar grind but with 10.5:1 compression ratio. That's a little too much cam if you are planning on keeping the stock bottom end. |
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| Author: | Chuck Valiant [ Tue Sep 24, 2013 5:49 pm ] |
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^Do you mean a .100 overbore and 198 rods? I was thinking about doing that and using forged pistons too. After reading this and seeing this, now I’m thinking that I might have a suitable cam already for what I want to do. So now I think I’m just going to open up the head maybe shave some off and just clean up the short block, put new bearings, timing gears and chain. |
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| Author: | Chuck Valiant [ Thu Sep 26, 2013 3:42 pm ] |
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Do you think I should shave my head say .060 to gain some compression even though I'm going to stay with my stock cam? Took my head in to have it machined and I forgot all about this. |
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| Author: | Charrlie_S [ Thu Sep 26, 2013 3:54 pm ] |
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Quote: Do you think I should shave my head say .060 to gain some compression even though I'm going to stay with my stock cam?
I woiuld. You are going to loose about .015 in just the difference in head gasket thickness, between the OEM shim steel gasket, and an aftermarket gasket. Then there is the original low compression ratio to start with.
Took my head in to have it machined and I forgot all about this. |
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| Author: | Chuck Valiant [ Thu Sep 26, 2013 6:35 pm ] |
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Thanks Charrlie, I called them back as soon as I saw your reply. I asked them to shave off .066, I hope my ignorance pays off. haha |
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