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Old 10-31-2012, 12:28 PM
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Truck engine build, here's no turning back now......

(OOPS! "there's no turning back....)

The machine shop called and my 350 roller block is good, the crank was toast but they have a shelf full of cranks. The build will be a 355 with KB-118 22cc D-cup pistons, 8.7 SCR, approximate DCR of 7.4 and target quench of .040" +/- .002" I'm running a Comp Cams XR264HR-10 roller installed "straight up", it's ground on a 106 ICL and valve overlap is 47. Heads are stock (NIB) '062 Vortecs cut for .500" valve lift with LS6 beehive springs and screw in studs, Performer intake with an M4ME Q-jet on a 1" spacer and Doug Thorley 1-1/2" ceramic coated tri-Y headers. It's "etched in stone" now, right or wrong it is what it is.

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Last edited by Hippie; 10-31-2012 at 12:30 PM. Reason: Getting old......
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Old 10-31-2012, 01:03 PM
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Quote:
Originally Posted by Hippie View Post
8.7 SCR, approximate DCR of 7.4 and target quench of .040" +/- .002"
I agree with the SCR at 8.7:1, but with the intake valve closing at 32 degrees after bottom dead center @0.050" tappet lift, the DCR works out to 7.794:1, call it 7.8:1. That's workin' the numbers on the KB calculator. Another calc may show slightly different numbers like you posted. Should make a nice truck motor that will run on most any kind of fuel without detonation. Here's the cam card....
08-412-8 - XTREME Energy

Last edited by techinspector1; 10-31-2012 at 01:15 PM.
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Old 10-31-2012, 03:30 PM
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wow,that will be a nice engine if you use a small 4 barrel and high velocity intake,small headers and free flow exhaust system.I dont see why it wont make 300 horses all use able power from idle up.
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Old 10-31-2012, 04:35 PM
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Originally Posted by techinspector1 View Post
I agree with the SCR at 8.7:1, but with the intake valve closing at 32 degrees after bottom dead center @0.050" tappet lift, the DCR works out to 7.794:1, call it 7.8:1. That's workin' the numbers on the KB calculator. Another calc may show slightly different numbers like you posted. Should make a nice truck motor that will run on most any kind of fuel without detonation. Here's the cam card....
08-412-8 - XTREME Energy
Yeah, mileage definitely varies with DCR calculators. Somebody told me if you use the KB calculator but plug in the IVC for the advertised duration instead you'll get very close to the results you would get with Pat Kelley's calculator and I have found that to be true so that's how I calculated mine. Regardless, I know a carbureted 355 with 9.2 SCR, the same heads, unknown quench and slightly smaller cam can run on 87 in a truck no sweat. I'm anticipating 87 Octane being the "good" stuff in the not so distant future.

Quote:
Originally Posted by vinniekq2 View Post
wow,that will be a nice engine if you use a small 4 barrel and high velocity intake,small headers and free flow exhaust system.I dont see why it wont make 300 horses all use able power from idle up.
Me either.
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