Air induction; hood scoops

[TheAutumnWind]

Have you looked at ultimate TBI mods?

https://harristuning.com/Tbi/recommended-350-tbi-mods/

https://harristuning.com/Tbi/ultimate-tbi-mods/

Whoops not applicable to a 98 350. Just ignore me.

 

[Supercharged111]

Does anyone know off the to of their head what diameter the narrowest part of a 5.7 Vortec's throttle body is? Still trying to figure out if my LPG mixer is restricting flow. Its ID is 45mm.

The blade is 75mm and the body necks down around 72mm at the base.

 

[454cid]

The HD trucks do get a thicker radiator.

See comparison of my stock 28" vs HD 34". The core is twice as thick.

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Those must both be small block radiators. 454 radiators are taller.

 

[TheAutumnWind]

Those must both be small block radiators. 454 radiators are taller.

According to summit: Radiator, Direct Fit, Aluminum, Plastic, Chevy, GMC, 5.0L, 5.7L, 7.4L, Each
Radiator Finish:Natural

Core Width (in):34.063 in.

Core Height (in):17.250 in.

Core Thickness (in):2.188 in.

Row Quantity:2

Transmission Cooler:Yes

Trans Cooler Line Connection:1/2-20 in. inverted flare

Trans Cooler Adapter Fittings Included:Yes

Inlet Size:1 5/16 in.

Outlet Size:1 9/16 in.

Fan Included:No

Radiator Cap Included:No

Quantity:Sold individually.

Notes:Measures 34 in. between tanks. Fits applications with an engine oil cooler with the heavy duty cooling system. Replaces OEM part number 52478818. Designed with stress relief cuts to allow thermal expansion. See charts and guides. Radiator designed with precision stress relief cuts to allow thermal expansion. Relief cuts are not a defect.

 

[Supercharged111]

Still not an HD radiator, that's for the cop Tahoe. HD radiators are taller like 454 said, and they come thin, thick, and diesel.

 

[454cid]

Still not an HD radiator, that's for the cop Tahoe. HD radiators are taller like 454 said, and they come thin, thick, and diesel.

I'm not talking about the 3500 HD, those have taller filler necks and won't fit a pickup at all if you want the hood to close. However my non-HD 454 radiator is taller than a small block radiator. It has a core height of around 19.5".

 

[454cid]

According to summit: Radiator, Direct Fit, Aluminum, Plastic, Chevy, GMC, 5.0L, 5.7L, 7.4L, Each
Radiator Finish:Natural

Core Width (in):34.063 in.

Core Height (in):17.250 in.

I just checked multiple years on Rockauto for 2500 and 3500..... 454 Vortecs and even 95 TBI's get the 19.5"-ish core radiator. When I went back to 90, they also listed 17"-ish core radiators, so it's a year thing.

I say "-ish" because each manufacturer lists the measurement a bit different. My TYC says 19.41"

 

[PlayingWithTBI]

When I went back to 90, they also listed 17"-ish core radiators, so it's a year thing.

That's probably right - "core" as apposed to "overall" dimensions. My radiator is 17-1/4" X 28-1/4" "core" and 20-1/4" X 33-7/8" "overall".

 

[Supercharged111]

I'm not talking about the 3500 HD, those have taller filler necks and won't fit a pickup at all if you want the hood to close. However my non-HD 454 radiator is taller than a small block radiator. It has a core height of around 19.5".

I wasn't talking 3500HD either, but I guess my wording was confusing in that respect. My point being, a 1500 short 34" radiator could be had thick like a 454 dually which looks like what he'd posted. Then the tall ones came in the 2500s as single core like my short 34" radiator in my 1500. I pulled one from a 454 2500 Suburban. I'm not sure what box you had to check to get the big one like my dually has, but it's tall and thick. Same dimensions as a diesel radiator, but not all weird.

 

[TheAutumnWind]

Interesting. I had no idea there were taller rads in those trucks. I don't remember how I came up with the part number but apparently I happened to get it right for my application