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lq4 estimate

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Old 11-04-2009, 04:18 PM
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Default lq4 estimate

Here's the setup. lq4 stock bottom end with arp rod bolts, advanced airflow cnc'd 806's, 236/242 .580./.590 cam 112 lsa cam, victor jr manifold, 750 holley, 1 3/4 longtubes. any guesses, also do you think i will have enough clearance to run a .040 headgasket?
Old 11-05-2009, 05:45 PM
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nobody?
Old 11-05-2009, 06:18 PM
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What size valves and combustion chambers? Not sure what 806's are
Old 11-06-2009, 07:28 AM
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"you think i will have enough clearance to run a .040 headgasket?"
Check it, B4 U fold some p rods up... or worse.
Old 11-06-2009, 07:30 AM
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Originally Posted by livefast1
nobody?
ONE BILLION ZILLION HORSPOWERZ!!!11!!1!one!!!1

(ask a silly question, get no answer...TTT it and you get this)
Old 11-06-2009, 11:26 AM
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what was silly about the question? i gave my combo and asked for an estimate of what kinda power it will make.
Old 11-06-2009, 11:27 AM
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and valves should be 2.00 1.55 stock size with 64cc chambers i believe.
Old 11-06-2009, 11:43 AM
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I think 806 heads were stock on my 97 ls1 and they are almost 68 cc's with the stock valve sizes you listed.

I couldn't ever find very much information on them but take into consideration the head flow and casting improvements progression from 806 to 856 to 241 to 243.

What's the displacement of an LQ4?
Old 11-06-2009, 11:47 AM
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its a 366, the 806s i bought are cnc ported should flow better than the 317s i took off none the less and a 68cc chamber is still better than the 317s 72cc i figure.
Old 11-06-2009, 11:48 AM
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6 liter
Old 11-06-2009, 12:55 PM
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Some of those engines have dish tops (I think I remember reading) in which case it would give you a factor of safety with the P to V clearance, but you still should check weather dish or flat top. Well certainly for flat top.

6.0 L with ported heads and that cam should be well above 450 rwhp horse if it's in a manual .
Old 11-06-2009, 05:26 PM
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yea i think i'm gonna do an old school four speed swap as well, the lq4 does have dish tops but i will clay it before final assembly.




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