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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6672 |
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What roller cam Tom?
Cannot find an off the shelf roller camshaft that fits the factory iron heads to provide the 450 HP goal. Not without a 6500 to 7000 RPM top end, which is a very poor bottom end. The head flow is the ceiling on building HP unless you get the iron heads ported, which pretty much equals buying Edelbrock aluminum if not doing this yourself.
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wrebelmachine
AMC Apprentice Joined: Aug/08/2019 Location: SW Missouri Status: Offline Points: 162 |
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custom would be the way to go. But for off the shelf an old school herbert would work.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6672 |
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Just crunched the numbers with the Herbert CA6K roller camshaft and 502 stock heads.
360 HP @ 4250 RPM. Not near the recipe requested. More head flow required to utilize any camshaft above 0.480" to 0.490" of lift. Mathematically, this is the break even point on stock heads. There are always exceptions with real radical lifts and higher RPM's. But from a cost perspective, these don't make a lot of sense unless your building for a specific purpose. And the CA6K is a pretty radical lift at 0.624/0.640" and is choked off by head flow. It cannot even reach it's designed higher RPM levels. A custom roller, possible, but unless we can see the numbers, wouldn't hold my breath:)
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rsrguy3
AMC Addicted Joined: Jun/24/2012 Location: Utah Status: Offline Points: 650 |
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This is fascinating, the factory number for hp in 71 was 350. So they designed it to its full capability and potential that year? If that's the case, man, that's just stupid cool.
I really only care about the torques. I intend to run it as is until winter and then start sourcing parts, heads first. Tom, Does a complete rtr roller kit exist or do I need to source parts individually?
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javguy
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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With 10:1 compression and a 215 @ .050 cam or bigger, air gap, torker, or vr jr intake, headers with a real good set of heads you can hit the 450 hp / 500 tq goal
The smaller the cam the more head work you need to have done to get there I listed a 215 @ .050 because you say you are looking for lots of low end torque
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7882 |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5782 |
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This is the smallest roller in the Comp lineup, 0.513" might just about work with factory heads:
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I've finally given up drinking for good...........now I only drink for evil.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6672 |
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Looked at that, just before cooking supper. Have not crunched any numbers, but believe that that cam would be close to 420 HP with factory heads, 9.5 SCR, premium pump gas and OP's other pieces.
Will be tomorrow at best to do the math, which is always on the edge of true performance. The dyno or track times are the only measurable facts.
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rsrguy3
AMC Addicted Joined: Jun/24/2012 Location: Utah Status: Offline Points: 650 |
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You guys are great. It's good to have this thread to look forward to, today was rough but also good, bitter and sweet.
I'm not tied down to just what I have as a base. I'm truly interested to understand what you gents would do for yourself if you were starting with just a 401 block and factory forged crank. What's a sensible power target for a regularly driven street motor?
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javguy
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2418 |
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That would be a nice little cam, but I would probably order a custom grind with a touch more duration it were mine. I have a stock Ford 302 GT40P long block from a 2003 Explorer that I added Performer RPM intake, 600 Holey, along with all the typical hot rod pieces. I installed a Ford Motorsports F303 hydraulic roller cam that specs 226/226 @ .050" duration, .512"/ .512" lift. This is a very well behaved street engine in a 1980 Fairmont Futura. Judging from the way it drives and pulls I wouldn't hesitate to use a similar profile in a 401 street engine. Tom
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Molnar Technologies Full Service Dealer - Crankshafts & Connecting Rods
1969 AMC Rambler Rouge Race Car 1974 AMC Hornet Hatchback, Wally Booth Outlaw Nostalgic Pro Stock Race Car Project |
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