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6.4L 388 ls3 dyno guesses?

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Old 04-25-2017, 11:33 AM
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Originally Posted by big hammer
they're the medium bore heads. I initially bought them for a stock bottom end ls3 build
My bad, medium bore is what I meant. Knowing now that you're doing the 388, would you have opted for the larger bore LS3's?
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Old 04-25-2017, 02:31 PM
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Originally Posted by Rise of the Phoenix
My bad, medium bore is what I meant. Knowing now that you're doing the 388, would you have opted for the larger bore LS3's?
Not necessary, unless i went to a a 427. The medium bores have a really nice CSA for what I'm doing IMO.
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Old 04-25-2017, 03:11 PM
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Originally Posted by 64post
Navy, 251*/265* 115*+4* .680"/.650" is relatively mild?
Equates to 245*/259* in HR which on a 434" with a 270 CC or less
intake port & 200 shot N2O is relatively mild or moderate IMO.
And the lifts for a LLSR are relatively mild as well.

OP sorry to muck up your thread.
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Old 04-25-2017, 03:24 PM
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Originally Posted by big hammer
Not necessary, unless i went to a a 427. The medium bores have a really nice CSA for what I'm doing IMO.
Agreed. I think these heads are going to work well for your application. Once you start getting into the 427+ cubic inch range, the MAST LS7 heads make more sense in my opinion.
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Old 04-25-2017, 05:38 PM
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Originally Posted by Rise of the Phoenix
Agreed. I think these heads are going to work well for your application. Once you start getting into the 427+ cubic inch range, the MAST LS7 heads make more sense in my opinion.
I'd worry less about displacement and more about the bore size.
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Old 04-25-2017, 10:42 PM
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Originally Posted by Darth_V8r
I'd worry less about displacement and more about the bore size.
^^^^^^^^^^Agreed!!!!^^^^^^^^^^
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Old 04-27-2017, 10:38 PM
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Originally Posted by Darth_V8r
I'd worry less about displacement and more about the bore size.
Nailed it. Anything 4.125 and more needs a ls7 or bad *** cathedral. Anything less is fine for ls3 junk. Cathedral still preferred tho.
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Old 04-28-2017, 07:58 AM
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I would think a good set of ported 243's would be better than trick flow cathedrals
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Old 04-28-2017, 10:48 AM
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Originally Posted by big hammer
I would think a good set of ported 243's would be better than trick flow cathedrals

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Old 04-28-2017, 01:18 PM
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Think of the velocitah!
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Old 04-28-2017, 02:54 PM
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Originally Posted by blk00ss
That's you with the tow truck 445" w/ 235s LMAO!!
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Old 04-28-2017, 04:51 PM
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Originally Posted by NAVYBLUE210
That's you with the tow truck 445" w/ 235s LMAO!!
That would drag your pile up and down the strip
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Old 04-28-2017, 05:03 PM
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Clueless,
My Strip is 1 1/2 Mile.
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Old 04-28-2017, 05:06 PM
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Old 04-28-2017, 05:45 PM
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243 are pretty good. Especially the AI ones.
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Old 04-28-2017, 08:15 PM
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Got a cathedral vs rectangle port fight breaking out
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Old 04-28-2017, 08:20 PM
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And we're off.....
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Old 04-29-2017, 12:02 AM
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Originally Posted by speedtigger
And we're off.....
You have ls3 heads that's interesting how deep into the 13's are you and do have enough torque to even idle?
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Old 04-29-2017, 08:00 AM
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I like my cathedrals
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Old 05-12-2017, 07:16 AM
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Originally Posted by big hammer
I would think a good set of ported 243's would be better than trick flow cathedrals
What the hell is you thinking about ?
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