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Old 11-23-2012, 06:57 AM
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2002 vortec

ok got a question about this engine i bought for my 51 1/2 ton truck . i dont know crap about engine building so i need advice on tis engin 2002 L31 vortec . the guy i bought it from rebuilt it converted to carb which will be 800cfm rochester quad and put this cam it with no mods. will i have problems running this cam such as vac. lift, springs, mpg. if so can someone recomend a cam for me. like i said im not an egine builder. this will be a daily driver. all advice welcome. just want something with good streetability with a little gitty up.

valve lift int. .480 exh. .480
cam lift .320 exh. .320
duration [sae] 287 287 valve lash hyd.
centrline 107 111 spread 109

timing events@ .050 cam lift
opens btc 8 bbc46
closes abc 42 atc4
duration int 230 exh 230
rocker ratio 1.5

Thanks
John

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Last edited by johnstruck; 11-23-2012 at 07:07 AM. Reason: forgot cam specs
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Old 11-23-2012, 08:02 AM
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2002 vortec

this is a 5.7.

John
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Old 11-24-2012, 10:32 AM
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Quote:
Originally Posted by johnstruck View Post
ok got a question about this engine i bought for my 51 1/2 ton truck . i dont know crap about engine building so i need advice on tis engin 2002 L31 vortec . the guy i bought it from rebuilt it converted to carb which will be 800cfm rochester quad and put this cam it with no mods. will i have problems running this cam such as vac. lift, springs, mpg. if so can someone recomend a cam for me. like i said im not an egine builder. this will be a daily driver. all advice welcome. just want something with good streetability with a little gitty up.

valve lift int. .480 exh. .480
cam lift .320 exh. .320
duration [sae] 287 287 valve lash hyd.
centrline 107 111 spread 109

timing events@ .050 cam lift
opens btc 8 bbc46
closes abc 42 atc4
duration int 230 exh 230
rocker ratio 1.5

Thanks
John
seems close to the 4X4 cam comp offers. Thats alot of duration I think you will need to follow comps advice for the

08-414-8 Xtreme 4x4.
Hydraulic Roller-Strong mid-range power, needs headers, 3.73-4.10 gears, 2500 stall, rough idle.

less duration with around the same lift I would think.
But i'm on my first build as we speak so take my advice for what it's worth
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