Is anyone running the ht383 gmpp? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hammond68 · 10-21-2018, 10:14 AM

I'm thinking about getting this engine. There doesn't seem to be many reviews for how long this engine has been available.

**jocko** · 10-21-2018, 10:52 AM

I've been looking at one too. There are several folks on the board that have them. I like the fact that it has a mech fuel pump (as compared to an L31R, which requires electric), but it's more than twice the price too. It's a good engine, no doubt about that.

diesel burner · 10-28-2018, 05:54 PM

I bought the ht383 in 1998 for my 71 c20 with turbo 350 behind it. I absolutely love that motor. I upgraded to an edelbrock performer rpm intake and hedman headers with 2.5" exhaust with flowmaster 40s. Now the same motor is in my 71 k20 with an nv4500 behind it. Probably have close to 80,000 miles on it. Only thing I don't like is the vortec intake manifold. I need to replace the gaskets as they are leaking(sucking air)

Hammond68 · 10-29-2018, 03:13 AM

Thanks for the reply diesel. Did your mpg drop badly,stay the same or improve any?

diesel burner · 10-29-2018, 10:24 AM

I started with an edelbrock 1406 carb and my mileage was the same as the old 350, but I felt like I was driving with my foot to the floor all the time. I couldn't pull out to pass without it kicking down a gear. I put an edelbrock 1411 on it and my mileage went up 2 mpg and it is a lot better to drive. In my C20 with 3.73 gears I was getting 14-15 mpg. In my K20 with 3.54 gears and overdrive I'm getting 14 at best.
But the power from such a mild mannered motor is great. Idles smooth, great low end.... I love it !!!

Hammond68 · 10-29-2018, 10:30 AM

Thanks for the info diesel. I just didn't want to get poor milage compared to a 350. I'll probably buy this engine in about a month.

bhayes1 · 10-29-2018, 10:53 AM

A K20 w/ 3.54 gears. Please tell us more

diesel burner · 10-29-2018, 12:26 PM

Quote:

Originally Posted by bhayes1

A K20 w/ 3.54 gears. Please tell us more

I’ve got a 71 K20 that I plan on putting a 5.9 cummins in. So far I have put a Dana 60 in front and a Dana 80 in back, both from dodge pickups with 3.54 gears. It also has a NV4500 and np 241 with a HT383 powering it right now. It’s my daily driver so I’m waiting for a chance to swap motors
Posted via Mobile Device

**jocko** · 10-29-2018, 12:42 PM

That sounds like a great combo.

10-21-2018, 10:14 AM	#1
Hammond68 Registered User Join Date: Mar 2018 Location: Bennettsville sc Posts: 105	Is anyone running the ht383 gmpp? I'm thinking about getting this engine. There doesn't seem to be many reviews for how long this engine has been available.

10-21-2018, 10:52 AM	#2
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,930	Re: Is anyone running the ht383 gmpp? I've been looking at one too. There are several folks on the board that have them. I like the fact that it has a mech fuel pump (as compared to an L31R, which requires electric), but it's more than twice the price too. It's a good engine, no doubt about that.

10-28-2018, 05:54 PM	#3
diesel burner Registered User Join Date: Nov 2017 Location: Enterprise Oregon Posts: 59	Re: Is anyone running the ht383 gmpp? I bought the ht383 in 1998 for my 71 c20 with turbo 350 behind it. I absolutely love that motor. I upgraded to an edelbrock performer rpm intake and hedman headers with 2.5" exhaust with flowmaster 40s. Now the same motor is in my 71 k20 with an nv4500 behind it. Probably have close to 80,000 miles on it. Only thing I don't like is the vortec intake manifold. I need to replace the gaskets as they are leaking(sucking air)

10-29-2018, 03:13 AM	#4
Hammond68 Registered User Join Date: Mar 2018 Location: Bennettsville sc Posts: 105	Re: Is anyone running the ht383 gmpp? Thanks for the reply diesel. Did your mpg drop badly,stay the same or improve any?

10-29-2018, 10:24 AM	#5
diesel burner Registered User Join Date: Nov 2017 Location: Enterprise Oregon Posts: 59	Re: Is anyone running the ht383 gmpp? I started with an edelbrock 1406 carb and my mileage was the same as the old 350, but I felt like I was driving with my foot to the floor all the time. I couldn't pull out to pass without it kicking down a gear. I put an edelbrock 1411 on it and my mileage went up 2 mpg and it is a lot better to drive. In my C20 with 3.73 gears I was getting 14-15 mpg. In my K20 with 3.54 gears and overdrive I'm getting 14 at best. But the power from such a mild mannered motor is great. Idles smooth, great low end.... I love it !!! __________________ 71 C10 Cheyenne 396, turbo 400 71 C20 Custom Camper 383,tko 600,14 bolt project 71 K20 Custom,Cummins,NV4500,NP205,dana 60F,dana 80R 06 GMC sierra 2500 extended cab duramax,allison 05 Toyota Corolla (commuter) 18 Chevy Tahoe RST (wifes car) 08 HD Roadglide

10-29-2018, 10:30 AM	#6
Hammond68 Registered User Join Date: Mar 2018 Location: Bennettsville sc Posts: 105	Re: Is anyone running the ht383 gmpp? Thanks for the info diesel. I just didn't want to get poor milage compared to a 350. I'll probably buy this engine in about a month.

10-29-2018, 10:53 AM	#7
bhayes1 Registered User Join Date: Jun 2016 Location: Central California Posts: 229	Re: Is anyone running the ht383 gmpp? A K20 w/ 3.54 gears. Please tell us more __________________ 1969 GMC K2500

10-29-2018, 12:42 PM	#9
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,930	Re: Is anyone running the ht383 gmpp? That sounds like a great combo.

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