lets build a 383 stroker

[Wildstreak]

Well I had originally wanted to put a 454 in my current build, but I think I would like to sell it as soon as its done rather than keep it. And I want that 454. So I have an old 350 that I would love to stroke if ya know what I mean :P. heres the deal, i have no clue on what rotating assembly to get. there is like a hundred on summit lol. the engine will be in a 4x4 so torque is a must. what kit would you all recommend for a 4x4(like what type of pistons and size of chambers ect)?

[Wildstreak]

what would be a good cam to run as well?

[shortbed70]

Look for a complete scat rotating assembly. Cam is really based on what the use is going to be but I'm partial to lunati cams but have a comp cam now and have had no problems. Look at northern auto parts for good prices. If your racing it get forged stuff if driver\racer you can go with cast crank. Your cam needs to be matched with alot more components than just usage IE tire size,gear ratio compression,heads etc. Call the manufacturer and talk to them they know best.

[Wildstreak]

it will be my dd till sold but I will be running a 6'' lift with 35''x16" tires and will see the odd mudd puddle :P. I have newer heads but who knows what the stats are, but I can always get new valves and springs. I was actually thinking of doing that anyway, I have a roller setup as well in 350 that I could use some parts from. So the motor will probably get rollerized(idk if thats a word lol) as well. itll be running a 700r4 as well. I dont want to go all out either just a midrange build, say the 450hp 500tq area. Im just looking for suggestions to get and what people have done successfully.

[Wildstreak]

I know theres more opinions out there!

[BurnoutNova]

I am building a 383 for my 86 K10 and am using an Eagle rotating assembly with speedpro flat top pistons. As far as a cam, it has a Comp Xtreme 4x4 X4262H cam. I'm just use the stock heads, with 1.94/1.50 valves. It will have springs mathced for the cam. I also have a Holley truck avenger 670cfm carb for it.

For my purpouses I think this engine will be fine, it limitations are definately in the heads but I'm not really worried about it having tons of h/p. As long as it has good low end torque I'll be happy. The truck has 4.10 gears and a SM465 trans so I should be able to do plenty of damage to the drivetrain!

[Ticker]

How much do you want to spend?

All decisions come from this first one

[Wildstreak]

thats what I hope to aim for. low end hp and torque is best for the 4x4s. I think I found a good site that helped me understand what will make a 383 run best.

[BurnoutNova]

Originally Posted by Ticker

How much do you want to spend?

All decisions come from this first one

You can get an affordable engine kit if you get a cast crank and hyperutectic pistons. You really don't need to go with forged if its not going to be a real high h/p motor. At work we go through a company called Sterling Bearing for most of our engine related parts. I don't know if they will sell to the public or not but there prices blow Summit and even Northern Auto out of the water.

[Wildstreak]

Originally Posted by Ticker

How much do you want to spend?

All decisions come from this first one

just to clarify I will be talking in american funds, but I am canadian lol. I was looking at the kits and they range from 700-1500 and Id be willing to spend 700 but will spend the 1500 if I have to but dont see much point in that because they offer shortblocks for 1800. Im just more or less worried about what type of pistons to get(dome,flat,ect,size cfm,ect) and cam and what not.

[BurnoutNova]

Originally Posted by Wildstreak

just to clarify I will be talking in american funds, but I am canadian lol. I was looking at the kits and they range from 700-1500 and Id be willing to spend 700 but will spend the 1500 if I have to. Im just more or less worried about what type of pistons to get(dome,flat,ect,size cfm,ect) and cam and what not.

I would go with flattop pistons, dont go with dome pistons you don't need the compression and premium or even high octane fuel will break the bank in a hurry. I went with flattops and a little bigger cam because the truck will not be used every day.

If you want somthing mild, get dish pistons and an RV cam and you'll still be very happy with the torque the 383 will have. If your not worried about fuel mileage put some flattops in and a similar cam to the one I listed.

[Wildstreak]

weird the site I was looking at suggests that a flat top piston would have a higher compression with my heads than a dome shaped one.

[BurnoutNova]

Originally Posted by Wildstreak

weird the site I was looking at suggests that a flat top piston would have a higher compression with my heads than a dome shaped one.

That seems odd, you sure they didn't list it like this; -.100cc dome?

Sometimes they call them -dome. Would be less confusing if they just called them dished. But in most cases (If I said all cases there would be an exception I'm sure) anyway, most cases a Flattop will have a lower static compression ratio than a dome top piston. I would shoot for an 8.5 - 9:1 static compression ratio.

[Wildstreak]

I wouldnt say that this guys was right I was just kinda using his suggestions to get a clue as what to order, this is what he had said

The results are as follows for a one- or two-piece rear main seal with these piston and head combinations:
Inverted dome at -18cc pistons:
Compression ratio: with a 58cc head: 10.3:1; with a 64cc head: 9.7:1; with a 76cc head: 9.6:1.
Flat top at -7cc pistons:
Compression ratio: with a 58 cc head: 11.7:1; with a 64cc head: 10.9:1; with a 76cc head: 9.6

wouldnt 8-9 be a low ratio for compression?

[BossHogg69]

Originally Posted by Wildstreak

I wouldnt say that this guys was right I was just kinda using his suggestions to get a clue as what to order, this is what he had said

The results are as follows for a one- or two-piece rear main seal with these piston and head combinations:
Inverted dome at -18cc pistons:
Compression ratio: with a 58cc head: 10.3:1; with a 64cc head: 9.7:1; with a 76cc head: 9.6:1.
Flat top at -7cc pistons:
Compression ratio: with a 58 cc head: 11.7:1; with a 64cc head: 10.9:1; with a 76cc head: 9.6

wouldnt 8-9 be a low ratio for compression?

that's a dished piston. I would run flattops and a 76cc chambered head. most aftermarket heads are available with this size chamber. Flattops, a cam with around 230-240* duration at .050" and nice set of heads with a 180cc runner (trick flow, AFR, Brodix) is about what it will take to get 450hp out of a 383. A well set up pair of Vortecs may do it too, but you'll need a dished piston to keep the compression ratio right for pump gas. just keep the cam and runner size reasonable and know that a 450hp motor will not be cheap to build, if that's what you're really after.

[Wildstreak]

I think I actually have vortec heads but thats just what i was told, I would have to do some research to see if they actually are. boss youre right along the thoughts I was going to go with lol. I have been leaning toward this kit from summit what do you think about it? http://www.summitracing.com/parts/ES...0/?image=large

[BossHogg69]

I actually bought that same kit about 4 years ago, but with a 1pc rear main for a 383 that I ended up selling (used the money to buy heads for the 468 BBC I have now!). I used a '96 model vortec block and those guts. that is a good base for what you're after.

[Ticker]

I'm still not clear on your total budget from engine out to engine in. It's not just about the ass'y - there's machine work, etc. If you've got existing heads, then they're likely tired and are going to need attention too - and a casting number is needed to make any recommendations.

You're kinda jumping in in the middle - budget and power targets, along with what you have currently in parts and the engine/trans are really needed to give any practical guidance.

[Ticker]

Originally Posted by Wildstreak

I think I actually have vortec heads but thats just what i was told, I would have to do some research to see if they actually are. boss youre right along the thoughts I was going to go with lol. I have been leaning toward this kit from summit what do you think about it? http://www.summitracing.com/parts/ES...0/?image=large

That kit is externally balanced - which you absolutely don't want if the engine is going to regularly see north of 5000 RPM.

[Wildstreak]

well first, it will rarely see 5000rpm plus, its a 4x4, we like to make low power and torque. Maybe in the odd mud puddle it might get revd higher :P, but in all actuality it isnt a race car so below 5000rpm would be typical wouldnt it? the other kit said something that needed different balanced and flex plates. I thought I had explained in the first response that I was willing to pay what I needed, and obviously I understand that there will need to be machine work on the block, I have good heads that have been rebuilt and are not "tired" they had just been resealed. worst case scenario like I said before I would replace the valve with a new setup. the engine had a top end rebuild about two years ago with a new cam and roller rocker set up. the heads where rebuilt then. the botom end had never been rebuilt so its not bored over. Dont you usually build and engine from the ground up? decide what you want to run, find a block find the bottom end, ect? I was just trying to figure out what combos to use because when I went to summit i felt really overwhelmed by all the choices. I might even get new alum heads if i can squeeze the money out.

[Wildstreak]

just finished watching this

http://www.spike.com/full-episode/tr...-testing/34918

pretty much what I was thinking now I know what I want lol

[Wildstreak]

this is what Im thinking of ordering so far, (I have roller rockers that I could use as well)
http://www.summitracing.com/parts/ES...0/?image=large
http://www.summitracing.com/parts/ED...6/?image=large
and Im really considering these as well
http://www.summitracing.com/parts/EDL-60899/

[au03z71]

I'm building a 383 currently. It's an 80-85 roller block bored .040 over with a 383 Eagle stroker crank (cast) and KB hyp pistons. I have Patriot Vortec heads. Also, I have a Comp XR276HR roller cam in it with 1.6 gold Comp roller rockers. It should be a pretty stout little motor when it's done.

[Salali]

Sorry to bring up a dead topic but I am having an issue.

I recently ported a set of GMPP fast burn heads, for a friend of mine, that are going on a 383.
I had a 383 sitting in the shop that had been dynoed with a different set of heads, so I offered to dyno his heads on it to see the power potential of his heads, and to compare to the heads it had already been dynoed with.

We first dynoed his new heads with everything just like the 383 had already been dynoed with. Then we changed out the cam to the cam he plans on running in his 383.

The engine is,
4150 braswell carb,
ported motown intake with 1" spacer,
GMPP fast burn heads with 2.02"/1.56" valves with a finished volume of 210cc. (were GMPP vortecs)
1.7/1.7 shaft rockers
flat top pistons with a comp. of 11.5/1
4.031 bore x 3.75 stroke
1 3/4 x 1 7/8 step header, 3" collector

1st cam dynoed = comp cam 236/248 108 lsa .380in/.367ex lobes.
2nd cam dynoed= Howards shelf cam 255/261 108 lsa, .400 in .413 ex lobe

The 3 columns listed are with the Howards cam at 102*/105*/108* ICL.
When we switched to the bigger cam, peak TQ rpm went up 400-500 rpm, but peak HP rpm was very little higher than with the small cam.

Why? What’s the limit to peak HP rpm on this engine?

What would you change if looking for more power, but no more rpm?

What does the results of these 3 cam position pulls tell us about the engine/cam?

I realize there will be info wanted by some, so just ask.

I can post a pull with the small Comp cam if needed.

[Captainfab]

Your dyno results are not showing up.