When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So I took my 2004 Silverado to the dyno a couple weeks ago and it only made 331whp and around 333 ft-lb. I'm honestly not satisfied with the numbers, what can I do to make it reach around 400whp while keeping it naturally aspirated? One guy told me to bore the block to 5.7 and get some flat top pistons, would that get me up to around 400whp?
Current mods:
243 heads
tsp cam 212/218 .600/.600
tbss intake manifold
Shorty headers
Cold air intake
The best thing you could do would be to get a 6.0 short block and move your cam & heads over to it. That would probably get you there.
Your curves also look like they have some tuning oddities in them. Who did your tune?
Well I live overseas, it's some guy with a laptop lol idk much about tuning honestly, all I know is that he uses HP tuners. You think his tuning is not that good?
The easy route would be 100 shot wet nitrous kit and pull a couple degrees of timing, then go colder on the plugs. And get those shortie headers off and do some good long tube headers. That'd put you over 400 easy.
I wouldn't say that; rather, it looks like he's not finished yet. It looks like it needs more work. There shouldn't be dips like that at 3500 and 4700 RPM.
Mamo heads, fast 102 ported, bigger cam, longtubes and full exhaust with good merge and muffler may get you pretty close.
I'd put more stroke in it before more bore. Truck needs torque, therefore, I would not focus on hp as much. I would look into a good head, no bigger than 225, stroke it, slightly bigger cam or the same, call it good. It will be a fun truck. What trans and rear?
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
5.3 from 260 to 400hp? 
