LS1 Brent

How hard is it for a RCSB 5.3 manual 5 speed to run in the high 12's all day long? I know it's damn easy for f-body's but I just wanted to know like a list of mods you can do to get it to run 12's.

Mangled03gmc

iTrader: (95)

How you get a manual with a 5.3.I am sure they only come with the 4.8.But regardles you should be able to get an auto in the 12,s with headwork,cam,stall,tune,some gears that should be pretty close.If not slap some FI on it or some sneaky pete

LS1 Brent

I didn't know you couldnt get a 5.3 with a manual transmission. I know I definatley want a manual transmission though. Are the 4.8's alot slower than the 5.3's?

Mr. Sandog

Don't think you can get a 5-speed with a 5.3L.

Badzracing

iTrader: (12)

.4.8's are NOT a lot slower. When my truck was stock ( it's a 4.8/5-speed) I used to race this dude in an automatic 5.3 truck like twice a week. He NEVER beat me. However, the 5-speeds that come in the 4.8 trucks are very weak. I'm on number 3 now. I believe that some 6.0 trucks come with manual trannies and they are supposed to be much stronger as well. You should probably look into 1 of them. More cubes and a better tranny= easier 12's.

onyx

they sold manuals with 5.3s on the 99's.

chris99gmc

well with slicks, no spare tire or tailgate, a tune, stall and some spray will get you there all day long until the bottle runs out.

sfj

yeah it might be kind of a pain in the **** without FI and still keeping it a daily not saying is impossible there are plenty of people doing it but their cams are pretty extreme and they have like 3k stalls i think i am sure one of them will post up and tell you

12sec.5.3

iTrader: (1)

I don't believe they ever made a 5.3 with a 5 speed, but a 4.8 yes. I know one of my buddies just swapped his 4.8 with a 5.3 with a 5 speed and had a hell of a time doing it. If you're just wanting a 12 second truck your best bet would be to start with a 6.0 auto. Tune, headers, stall, cam, heads= ~mid 12's

O3GMC

A quick shifting auto is the way to go for drag racing