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Throttle's Performance 383 build

General engine tech -- Drag Racing to Circle Track

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900HP
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Throttle's Performance 383 build

Post by 900HP » Thu Apr 16, 2015 7:35 pm

Several people were interested in this build so here you go. I also posted on the Bullet if you've already seen this.

I decided to do a fairly high effort 87 octane 385 cubic inch small block for my 3/4 ton crew cab shop truck. The idea was to make as much torque as possible and still keep the efficiency of the small block. The basic build goes like this:

GM block and ignition coils
Scat crank and rods
Manley pistons
Total Seal conventional rings
Speier 205cc heads
Lunati by Brookshire (the last one I have) camshaft 211º/219º @ .050", 107º LSA, .585/.555 lift w/ 1.7/1.6 rockers
Morel hyd. roller lifters
LGM shaft rockers
Edelbrock TR1yx vintage tunnel ram
Holley throttle bodies and 36# injectors
Megasquirt MS3-pro ECU
EFI connection 60-2 timing cover/ckp set

The engine made 420 ft/lbs @ 2700 rpm (as low as the dyno would hold it), It made 487 ft/lbs @ 4500 rpm and it made 466 HP @ 5500. Here are some photos of the engine and the dyno sheet. I will follow with random assembly photos.
383 truck dyno sheet 2.jpg
383 truck 27.jpg
383 truck 28.jpg
383 truck 26.jpg
383 truck 25.jpg
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Last edited by 900HP on Thu Apr 16, 2015 7:54 pm, edited 1 time in total.
Throttle's Performance
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https://www.facebook.com/pages/Throttle ... 1996281602

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Re: Throttle's Performance 383 build

Post by 900HP » Thu Apr 16, 2015 7:42 pm

random assembly photos
383 truck 3.jpg
383 truck 4.jpg
383 truck 22.jpg
383 truck 38.jpg
383 truck 40.jpg
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Throttle's Performance
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Re: Throttle's Performance 383 build

Post by 900HP » Thu Apr 16, 2015 7:45 pm

More photos........................
383 truck 16.jpg
383 truck 17.jpg
383 truck 29.jpg
383 truck 36.jpg
383 truck 32.jpg
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Throttle's Performance
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Re: Throttle's Performance 383 build

Post by 900HP » Thu Apr 16, 2015 7:48 pm

more photos yet....................
383 truck 42.jpg
383 truck 41.jpg
383 truck 43.jpg
383 truck 35.jpg
383 truck 19.jpg
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Re: Throttle's Performance 383 build

Post by 900HP » Thu Apr 16, 2015 7:52 pm

The last of what I have..............
383 truck 20.jpg
383 truck 23.jpg
383 truck 31.jpg
383 truck 36.jpg
383 truck 24.jpg
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Re: Throttle's Performance 383 build

Post by Orr89rocz » Fri Apr 17, 2015 8:15 am

Very nice! That fit under hood?

Curious how it would do with a common shelf efi intake like this.
Image

I had this in my old street strip 383 making somewhere near 480-500 hp. Fairly cheap and simple.

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Re: Throttle's Performance 383 build

Post by F-BIRD'88 » Fri Apr 17, 2015 8:52 am

Cool use of the Edelbrock Tunnel Ram.

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Re: Throttle's Performance 383 build

Post by 900HP » Fri Apr 17, 2015 9:13 am

Orr89rocz wrote:Very nice! That fit under hood?

Curious how it would do with a common shelf efi intake like this.
Image

I had this in my old street strip 383 making somewhere near 480-500 hp. Fairly cheap and simple.

I don't know if it fits yet or not, just got it off the dyno. I've measured and it's going to be very close, I may have to add a 2" cowl hood which isn't a big deal. The mini-ram would probably run fine but the runners are very short so it would probably loose bottom end over the longer runners of the street tunnel ram. I say probably because until you test it's just theory :wink: I also know you can get runner spacers for the stealth-ram which would increase runner length and that would help a lot. Also, having the throttle bodies directly over the runners as opposed to a single front mount is an advantage because the air has to turn less.

I'm guessing yours was more of a steet/strip effort instead of a towing/hauling effort? Super short cam timing in this one
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Re: Throttle's Performance 383 build

Post by RevTheory » Fri Apr 17, 2015 9:18 am

I had a feeling you would do a 107 with Chad's heads :D

This is exactly the sort of thing I'm looking to do for a long-bed, lifted square body but on a 496 base. Well, minus the tunnel ram, full-blown efi and shaft rockers so maybe not "exactly", lol.

Either way, I'm anxiously waiting to see what you do with the exhaust system.

Great job!

Edit: I hate to see someone start blowing holes in the "you need a wide LSA for towing torque" thing

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Re: Throttle's Performance 383 build

Post by 77cruiser » Fri Apr 17, 2015 9:20 am

What are you going to do for headers on the truck? Chad posted 215 for in. duration on TC. It's really 211?
Jim

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Re: Throttle's Performance 383 build

Post by 900HP » Fri Apr 17, 2015 9:24 am

77cruiser wrote:What are you going to do for headers on the truck? Chad posted 215 for in. duration on TC. It's really 211?
The cam card says it's a 215/219 which is what I ordered. It measures 211/219 so go firgure :?

Headers I really have 3 options. #1 Stainless Hookers 1 5/8" with 2.5" collector 4-1 design, quite small for the exhaust ports, sized about right for the power
#2 Stainless Works 1 7/8" with 3" collectors bolt-in for the truck and fit the exhaust ports...... easiest option.
#3 build a set of 1 5/8" step to 1 3/4" with the primary tube offset to the top of the port and stretched to fit the bottom.
This would be a 4-2-1 design and would make the best torque curve. This option is expensive and time consuming though.
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Re: Throttle's Performance 383 build

Post by user-9274568 » Fri Apr 17, 2015 9:28 am

Here is the Dynomation I ran before the dyno. I did have to fudge the manifold in this program, I think it was confused. However, good data in equals good data out!!

Image

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Re: Throttle's Performance 383 build

Post by 900HP » Fri Apr 17, 2015 9:31 am

RevTheory wrote:I had a feeling you would do a 107 with Chad's heads :D

This is exactly the sort of thing I'm looking to do for a long-bed, lifted square body but on a 496 base. Well, minus the tunnel ram, full-blown efi and shaft rockers so maybe not "exactly", lol.

Either way, I'm anxiously waiting to see what you do with the exhaust system.

Great job!

Edit: I hate to see someone start blowing holes in the "you need a wide LSA for towing torque" thing
Here is what I'm doing for exhaust, I just haven't figured out what I'm doing with headers yet. Single 4" up the right side with (2) mufflers. I wanted to keep the spare tire so I kept it single.
383 truck 18.jpg

Here is the truck it's all going in.......................
truck1.jpg
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Re: Throttle's Performance 383 build

Post by jeff swisher » Fri Apr 17, 2015 12:31 pm

I have used that same intake on a 350 and a 355" with many carbs and different cams and it works wonderfullll'
It out powers the RPM intake when I did some back to back butt runs with a few intakes tested.

But I have noticed your top is different than the vintage one I had.. Mine was much taller making the entire intake taller than 12" by just a hair.
But I see you need it to fit in that shiny truck.

Was the placement of the injector set low on the intake for a reason?
I would think you could get the fuel atomized better if it was raised up the runner a bit.
Possibly make more TQ. I know Duttweiler raised them in High HP big injector deals.. I don't know just asking.
I have not graduated to FI yet. I still like my carbs

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Re: Throttle's Performance 383 build

Post by novadude » Fri Apr 17, 2015 1:05 pm

Question: I noticed the valvespring pics and it got me wondering about what kind of seat and open load you are using for the hyd roller in relatively low rpm application like this.

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