GM Engine & Exhaust Performance EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |
View Poll Results: Which one would yall pick? give your reasoning in a reply
402 on LS2 block (aluminum)
5
55.56%
408 on LQ9 block (iron)
4
44.44%
Voters: 9. You may not vote on this poll

402 vs 408

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Old Aug 19, 2009 | 10:35 PM
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Default 402 vs 408

I want to know which one would yall pick if you all were in my sitaution. It's my DD right now but here pretty soon my dad will give me his 89 s-10. I want to stay N/A and still have a pump gas (91) setup. I will do no towing just racing/crusing.

Goals: low 12s consistenly

My truck: 2003 Silverado SS
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Old Aug 19, 2009 | 10:58 PM
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im in the same situation trying to decide what motor i want for my 89 s10 blazer i want to try to run a fuel injected set up because ill be cruising just as much as racing. but eventually my dad is getting a 434 sbc for his s10 and giving me his 406 sbc....anyway nice to see someone else in the v8 s10 game lol....i would go with the 408 lq9 iron block seems more reliable to me for a daily driver good motors! good luck!!
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Old Aug 19, 2009 | 11:03 PM
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The ls2 block is superior with the longer stroke when it comes to reliability and oil consumption
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Old Aug 19, 2009 | 11:13 PM
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I would go with the ls2 block as well
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Old Aug 19, 2009 | 11:42 PM
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so its going in the Silverado, right?

remember the lq9 is a gen3 motor, the ls2 is a gen4 motor, not much difference but there is some, maybe someone will chime in as to what has to be changed when swapping motors.

personally i would think a 402 because of lightweight but it is a mute point in a 4500lb ecsb truck.

either one will be fine but the 402 will probably be a little bit more expensive. they both will make the same power if the same parts are used
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Old Aug 20, 2009 | 07:23 AM
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Originally Posted by 03_SS_22

Goals: low 12s consistenly

My truck: 2003 Silverado SS
ITs going to be challenging doing consistant low 12's N/A and keeping it a "daily driver" in a 03 Silverado SS. IF you are looking for a Saturday night special type of truck, then it can be done with a good set-up and plenty of converter.

Originally Posted by nightrunner

personally i would think a 402 because of lightweight but it is a mute point in a 4500lb ecsb truck.
A stock 03 Silverado SS weighs in at 5,000+lbs without the driver. Add fuel, driver and other items and you are looking at one heavy beast. In track form, mine is just over 5400#'s with me in it.
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Old Aug 20, 2009 | 12:16 PM
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Originally Posted by krambo
ITs going to be challenging doing consistant low 12's N/A and keeping it a "daily driver" in a 03 Silverado SS. IF you are looking for a Saturday night special type of truck, then it can be done with a good set-up and plenty of converter.
I'm not planning on doing it that quickly. I'm a poor mexican. First, I want to do a 80e swap and beef up the 10 bolt. Then after that, i'll worry about the motor. Hopefully, my dad hands me down his s-10 when he gets a newer truck. I'm most likely going with TSP, like you did Kevin. They are closer to me than HKE or LME and i've seen some impressive motors come out of there. I'll be PM'ing you when I get close to my build time. BTW, your 408 build is what inspired me. Can't wait to see it going all out!
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Old Aug 20, 2009 | 12:54 PM
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are you keeping AWD? a saturday night special type of truck could do it easier as you can go more radical then. say a 4000stall in awd launch with a nice healthy motor should turn out some good times
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Old Aug 20, 2009 | 02:29 PM
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Originally Posted by nightrunner
are you keeping AWD? a saturday night special type of truck could do it easier as you can go more radical then. say a 4000stall in awd launch with a nice healthy motor should turn out some good times
yeah. i've been going back and forth but i think im going to stay AWD.
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Old Aug 20, 2009 | 02:59 PM
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Go with the aluminum block. Heck, why not go with an LS3 or LS7 block? 415-427"

You might as well step up to square port heads

And definitely keep AWD!
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