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Old 07-15-2014, 09:13 AM   #1
M3hta1
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Turning LS3 into 427ci

Hi Gents,

Hopefully this is the right section. I have started doing research and searching forums. From what I have found so far reaching is the following.

The LS3 376cui with a 4 inch crank shaft will become 417cui. Now what are my options to hit that 427 cui mark? Just a set of oversized heads?

I have a mild/semi aggressive cam, headers, cai right now and really like staying NA with a 100 shot or so.
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Old 07-15-2014, 09:20 AM   #2
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The 427 LS3 has a 4.1" or 4.125" crank. You get to 427 the same way you get to 416.
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Old 07-15-2014, 03:07 PM   #3
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There's a reason most people stop at 416. The stroke required for 427 is a little much for the stock LS3 block. It can and has been done but the 416 is much safer and easier on the engine.
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Old 07-15-2014, 06:55 PM   #4
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Stick with the 417, in case you want to go bigger with the nitrous or move to a blower. If you plan on a 100shot and are not going bigger you could get away with the 427.
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Old 07-15-2014, 07:12 PM   #5
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"Just a set of oversized heads?"
Huh?
Heads do not change the displacement.
Just a FYI .
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Old 07-15-2014, 07:15 PM   #6
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Originally Posted by c-57d View Post
"Just a set of oversized heads?"
Huh?
Heads do not change the displacement.
Just a FYI .
Don't the 6 bolt heads add displacement?
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Old 07-15-2014, 08:09 PM   #7
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no
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Old 07-15-2014, 08:43 PM   #8
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no
Seriously?!
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Old 07-15-2014, 08:47 PM   #9
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Seriously.

The 6 bolt heads use more head bolts, and have better clamping force as a result.

Engine displacement (size) is a formula. Bore X stroke.
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PROJECT HEAVY CHEVY
Camaro Now: Mods for the Masses Part I | Part II
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune
12.06@113 1.70 | + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune
11.84@115 1.59 | + 3.91s + Race Star 17x7 Fronts
10.90@125 1.47 | + GPI VVT Cam + BW Ported Heads + CD 3800
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Old 07-15-2014, 08:49 PM   #10
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Guess I will cancel my order.
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Old 07-15-2014, 08:50 PM   #11
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Originally Posted by jrhagen View Post
Seriously?!
Seriously. Cubic inches is based on bore, stroke, and how many cylinders. NOT anything to do with heads, or pistons.

COMPRESSION is based on heads and pistons.... If that's what you may have been thinking?...
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Old 07-15-2014, 08:52 PM   #12
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So surfacing the heads doesn't change the displacement?
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Old 07-15-2014, 09:13 PM   #13
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Quote:
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So surfacing the heads doesn't change the displacement?
Heads have nothing to do with engine displacement. Maybe you are thinking of compression ratios.
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Old 07-15-2014, 09:34 PM   #14
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Just jacking with you.

4x3x8 is my favorite engine.
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