Looking for guys running the HT383

[Jaycenk]

Hey guys I have some questions about the HT383. Gm states that it can be bolted in and the pcm adapts to it. How true is this? I understand that any GM engine can benefit from some custom tuning so this leads me to my second question.
How is the fuel mileage with stock programming on the HT383 V's the stock 350 on a stock pcm program? I understand it's a bigger horse bigger stroke engine but is the mileage a killer when daily driving it? If you state mileage please say what tune you are running.
Did an after market tune help mileage? performance?
Also what is the redline on the HT383? 5000? Is the stock 350 redline higher then the HT383?
Tons of questions I know but I am trying to weigh the pro's V's Cons of doing the HT383 over a stock replacement engine. I tow a 21 foot boat around on the weekends and daily drive it the rest of the week.
Also what all was involved with the swap? In other words what were the little things you did or didn't plan for during the swap. I see it comes with the distributor, water pump, ballancer, valve covers, flex plate. What were other items that should be planed to be replaced? Hoses, belt, engine mounts, gaskets for intake, T-stat... anything else?
Forgot it will go in a 98 Tahoe 4dr 2wd.

 

[SunlitComet]

don't have one but it will adapt however a tune bring the engine out. solid redline is 6k. need other data?

HT383E Engine Specifications:
Displacement: ....................................... 383 cubic inches
Bore x Stroke: ....................................... 4.005 inch x 3.80 inch
Compression.......................................... 9.1:1
Block: .................................................... Cast iron, four-bolt intermediate mains
Cylinder Head: ....................................... Cast iron Vortec
Valve Diameter (Intake/Exhaust): ... 1.94”/1.50”
Chamber Volume:.................................. 64cc
Crankshaft: ............................................ 4340 Forged steel, 1 piece rear seal
Connecting Rods: .................................. 5.7” Forged, powdered metal, 3/8” studs
Pistons: ................................................. Hypereutecic, 244-T5 aluminum alloy
Rings: .................................................... Plasma Moly
Camshaft: .............................................. Hydraulic roller tappet
Lift: .................................................. .431” intake, .451” exhaust
Duration:.......................................... 196° intake, 206° exhaust @.050” tappet lift
Centerline: ....................................... 108° ATDC intake, 116° BTDC exhaust
Rocker Arm Ratio: ................................. 1.5:1
Timing Chain: ........................................ 8 mm single roller design
Oil Pan: .................................................. 5-quart (w/ new filter)
Oil Pressure (Normal): .......................... 40 psi @ 2000 RPM
Recommended Oil: ................................ 10W30 Synthetic (after break –in)
Oil Filter: ................................................ AC Delco part # PF454 or PF52 (4WD)
Valve Lash: ............................................ 1/2 turn down from zero lash
Fuel: ....................................................... Unleaded - 87 (R+M/2)
Maximum Engine Speed: ...................... 6000 RPM
Spark Plugs:.......................................... R44LTS
Spark Plug Gap ..................................... .040”
Spark Timing: ........................................ Non Adjustable (crankshaft sensor)
Firing Order: .......................................... 1-8-4-3-6-5-7-2

 

[foreverfalcon40]

If you are going to Swap in a 383...

SINCE the engine by is def empty I would

Swap out the motor mounts. Most likely never been changed. I am **** about few few things...so I would Clean up the bay pretty well and if needed hit it few coats of paint.

Change any vaccum lines, hoses, and clean up wiring as needed. Little things you will appreciate at the very end.

Defently look into a tune. Our fuel system are limited hate to see some detonation.