I may have missed it, what year, engine, and trans do you have?
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Waste of time, money, effort, and enthusiasm. The 305 won't pull enough air that the throttle body is a restriction.should I shave off the TBI ridges around the ports below the fuel meter? What about a different cleaner? If the ridges are removed, should I go with a taller air cleaner or nah, since a no-ridge TBI provides a more direct path for cleaner air?
Yes. And the hot-air tube to the passenger side exhaust manifold fall/winter/spring if not year-round. Be sure the thermostatic element in the air cleaner snorkel actually works.I also figure I should keep the stock air cleaner casing with the zip tube coming from the fender panel for cooler air, right?
Yes.Smoother exhaust
He doesn't. This is all for a potential vehicle purchase.I may have missed it, what year, engine, and trans do you have?
The 305 won't pull enough air that the throttle body is a restriction.
Yeah the reason I'm asking is the title says "healthy L05", that's a 350. Depending on what trans, there's other options for tuning and gaining performance/MPGs, etc.He doesn't. This is all for a potential vehicle purchase.
Yes, you're probably right on the stock swirl port heads and up to 4,000 RPM. I seem to remember seeing dyno tests increasing HP/torque with those mods, including shaving the throttle shaft, and running up over 5,000 RPM. I just can't remember where I saw it, I'll have to look someday. With the throttle body bored out to 46mm, you get 650 CFM which will support a 350 up to 6,000 RPM. Then you have to add fuel and adjust timing, yada yada yada,I'm still not convinced that the throttle body is restricted; or that the "ultimate TBI mods" do any good. I say the cylinder head ports choke flow before the throttle body is a problem.
Oh, sweet! Thanks, guys! I probably went ahead myself and used AcDelco's RPO decode list that's online and explains nearly all codes on the RPO I got yesterday from a prospective seller of a darn clean L05 '05-to-06 (the weird MY that had the 'new' instrument panel assy without the passenger-side airbag 'gondola', yet still with the transfer case floor shifter).
Aside from 2-3 codes (that are 'Control - sales' something), I gathered this one has the tow package and some beefier options.
As much as I want a Vortec Burb, this one is nearing its rebuild... The top factor with this one it's rust free and got represerved like there's no tomorrow.
@Schurkey - Yep, 3.73 RAR, K1500, funky tow package things in it.
Oooops. I screwed-up. Yes, 350, not a 305.
Even with a 350, I'm still not convinced that the throttle body is restricted; or that the "ultimate TBI mods" do any good. I say the cylinder head ports choke flow before the throttle body is a problem.
Indeed, a word of explanation:Yes, you're probably right on the stock swirl port heads and up to 4,000 RPM. I seem to remember seeing dyno tests increasing HP/torque with those mods, including shaving the throttle shaft, and running up over 5,000 RPM. I just can't remember where I saw it, I'll have to look someday. With the throttle body bored out to 46mm, you get 650 CFM which will support a 350 up to 6,000 RPM. Then you have to add fuel and adjust timing, yada yada yada,
Longer primary length is for low-sped torque, not top-end power. The best headers for torque are tri-y but I do not know if Thorley makes them now.If you decide to got with long tubes you will need to wrap the pipes to keep the gasses hot. Otherwise your O2 will be off. Unless you run a 3 wire heated O2. Also it's un likely you will see much gain from long tubes. You will never turn enough PRM's for them to proving enough scavenging effects.
Also have you drove the truck yet? It may preform well enough for you, that all of this may be a mute point.