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shanesss new 408

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Old 03-15-2012, 01:20 PM
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Default shanesss new 408

Well im finally getting enough parts together to start showing off the new motor for the Silverado ss. The old motor (LQ9) went bye bye..lol. Not exactly sure what happened but both rear, #7 and #8 pistons blew to pieces. It went a best of 12.9 at bandimere with out the thunder racing blower cam on 10 lbs.
on to the new stuff.....

408 ci
Manley forged crank
Manley forged rods
Manley forged "blower" pistons
Hellfire rings
New ls3 heads with PRC double .650 lift springs
cam to be determined with help of Zippy.
comp push rods
Ls7 lifters
double roller timing set
ls6 valley cover
L92 intak with 87 mm TB
3200-3400 stall
Stealth 340 pump
60# injectors
and the D1Sc, 3 core on 10-12 lbs again.

Well im finally getting enough parts together to start showing off the new motor for the Silverado ss. The old motor (LQ9) went bye bye..lol. Not exactly sure what happened but both rear, #7 and #8 pistons blew to pieces. It went a best of 12.9 at bandimere with out the thunder racing blower cam on 10 lbs.
on to the new stuff.....

408 ci
Manley forged crank
Manley forged rods
Manley forged "blower" pistons
Hellfire rings
New ls3 heads with PRC double .650 lift springs
cam to be determined with help of Zippy.
comp push rods
Ls7 lifters
double roller timing set
ls6 valley cover
L92 intak with 87 mm TB
3200-3400 stall
Stealth 340 pump
60# injectors
and the D1Sc, 3 core on 10-12 lbs again.















Last edited by shanesss; 03-19-2012 at 10:15 AM.
Old 03-18-2012, 02:25 PM
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looks like a pretty stout setup about to go in man, pics?
Old 03-19-2012, 02:04 AM
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everything looks good except for those 60 pounders!
Old 03-19-2012, 10:29 AM
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yeah i think i may have to upgrade the fuel system soon but they are rated at 60lbs at 43.5 psi so it should be closer to 70 something at 60 psi.
Old 03-20-2012, 10:49 PM
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#7 and #8 pistons died were you using a stock intake with boost
Old 03-20-2012, 11:05 PM
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Great build. Any work done to the heads?
Old 03-21-2012, 02:13 PM
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Jablowme.... yes stock intake with boost.

Oakley6575....the heads are stock except the double prc springs.how does your 408 run?

I thought about going N/A but since I have the blower i figure why not... LOL
Old 03-21-2012, 02:23 PM
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My heads/intake are untouched as well. The truck runs great but I can't stand having stock heads on a fully built short block. I don't know if I should put a turbo kit on it with WCCH stage II port on the LS3's or stay N/A with AFR heads. Can't wait to see how yours performs.
Old 03-25-2012, 01:34 PM
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Originally Posted by oakley6575
My heads/intake are untouched as well. The truck runs great but I can't stand having stock heads on a fully built short block. I don't know if I should put a turbo kit on it with WCCH stage II port on the LS3's or stay N/A with AFR heads. Can't wait to see how yours performs.
If your truck is setup for N/A racing already, with a high stall converter and deep gears, and you're not willing to change them, then stay N/A.

But, turbo power will own N/A power any day.
Old 03-25-2012, 02:59 PM
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Is that at SAM?? Looks familiar I went there for the head and block course back in 05 I think. Dang good school. Did they ever get the cnc shop going?


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