350 vs. 383 durability?

[Bubba Ray Boudreaux]

f#ck it your not worth it.

That's NOT what she said.................................

 

[big_truxx]

getting back on topic slightly...

My personal prefference for longevity/simplicity/common parts would always be the 350. I have a 350 in 2 of my trucks. the 82 and the 75. 82 is a mr goodwrench. Best "stock" 350 I think they put that together with the right cam and it goes good. And the one in the 75 is a rebuilt (by whom and with exactly what parts i will never know) with a mild cam (lopes a little bit) and it goes great. Mind you my trucks are not set up for any one specific thing. The 82 is a 4 door dually... heavy with an auto and 3.73 gears, will still pull decent on hills w/ trailer and load. And the 75 has a 6" lift and currently 35" tires and 3.73 gears with a 465 tranny. Gears are kinda low for its application in either imho but the motors still do great for what they are. I do believe if you are looking for longevity a 350 would be better and cheaper to build. Most common parts for one. Also if you are lookinf to make 265-300 horse, that's where you will find yourself with my two 350's now. The mr goodwrench is rated @ 265hp and I think my rebuilt 350 may be putting out close to 300 but thats just a guess as I do not care to yank it out and dyno it just to find out. And with a 350 adding a mild cam will bump yer hp levels up enough to satisfy the 265-300 range I am sure

just my 2 cents worth for the day

 

[Jonny-K5]

boy its funny. you post a question at night, next morning there is over 20 replies, but only 3 that are actually answering the question
fun to read tho.

anyway, the power numbers that i stated were just a ballpark. my main objective is to have an engine that works best at the rpms i run at. so basically, i want it as strong an torquey as possible between 2-3000rpm.torque peak as close to 2500 as possible, while still producing a decent numbers. if it falls on its face at 4k, thats fine.its also gotta be pretty mild causs its gonna stay factory TBI, and i dont want to hassle with all the custom tuning crap to get it to run right.as long as it makes more "truck" power than my stock motor, i'd be happy.

i figured it would be easier to get more low end torque with a 383, but i didnt want to sacrifice reliability. i suppose if i use the 5.7 rods then there isnt a problem. the only thing i was thinking tho is that the increase in piston speed from the longer stroke would possibly decrease overall life.

while im at it here's another question, is it worth it? how much more would it cost to do a 383tbi vs. a 350, and would the power #'s justify that? i think for me it should be at least an extra 30 ft.lb of torque and a flatter powerband to justify the cost.

BTW , does anyone know what the torque # is and rpm it peaks at on a stock 89 350tbi? all i can find is the hp numbers.

 

[beater_k20]

a 350 and a 383 built with mostly the same parts except for the ones that you can't interchange like crank obviously will have the same hp numbers but the 383 willl have more torque... when you say same power do you mean hp and tq or just hp?

oh dear god! what is this world coming to? this actually makes SOME sense!

when you build a 350, and then turn around and use teh same exact parts to build a 383, but with .4:1 less compression, what you fail to realize is that the cam actually seems smaller with the bigger engine.

furthermore, the dynamic compression ratios are greatly different. while a 9.6:1 350 with an XE 268 ends up with an 8:1 DCR, the 9.2:1 383 ends up with a 7.65:1 DCR. had you left the compression equal at 9.6:1, the DCRs would also be equal. the higher DCR that the higher compression ratio of the 350 has gives it a distinct power advantage. but, the 350 is more detonation prone on pump gas with iron heads.

while watching dyno pulls as a small boy is fun, its nothing to be considered a learning experience until you've built the engines and are pulling the handle for yourself.

 

[BadDog]

Sorry to take this thread further OT, but I'm putting this here for reasons that will become obvious.

DW17 just got another vacation for the OT and hot headed b.s., but I want to strongly suggest that others avoid any type of provocative behavior in cases like this. Both Surpip and (to a lesser extent) BRB contributed significantly to this problem by making posts that not only contributed nothing to the thread topic but also served to make a bad situation worse. If all parties had made their points and moved on without intentionally trying to inflame the situation, we (the moderators) would not have had to get involved again. While this in particular does not seem to be "ban material", and certainly did not justify DW17s responses, but you guys are not helping when you intentionally provoke further bad behavior from other members. Same goes for ALL other members. Please try to refrain from this type of thing in the future or it may be necessary to start responding more aggressively in order to reduce the garbage.

 

[highrider_44s]

i would think getting low end touq is easier done with more cubic inch
but from what i understand about building a stroker (i could be wrong ) there is some machining that needs to be done to make the crank fit properly so i would think the longativity of the motor would relate to how much care was put into building it as well as how experienced the builder was. And also the quality of the parts and such.

but i wouldn't compare apples to oranges if you want reliability i think a well built 350 has proven itself time and time again

but on the other hand if you want something different with a little more spunk you can always stroke it

 

[PhoenixZorn]

In response to the question at hand, I'd seriously start looking at your local small town auto parts store... I just found out that I could have gotten a 320hp out of the box 350 long block for about $1300.00 had I just asked. I was dumb and thought the internet would be my salvation... but if I had just used the resources close to me, i would have not needed to pay for shipping, nor would I have needed to call Colorado with questions about my engine every day, since I would have been able to specify the parts myself.

When I say small town auto parts, i mean the guy who is running the store in the back of an Ace hardware... not the local AutoZone...

 

[Mad-Dog]

All things being equal the 383 will outlast the 350 because a bigger engine uses less energy to perform the same amount of work as a smaller engine.
I dont think the added expense of the 383 is justifiable with your mild goals.

 

[beastofablaze]

Just to be clear what part of DW17's post was the part the called for a vacation... seems a little steep to me. No name calling just one f word...

can somebody clear this up so i don't get the same fate.

 

[PhoenixZorn]

beast, multiple f-words, just all around bad attitude towards everyone.... i think..

 

[BadDog]

Well, the 7 day vacation was a result of multiple off-topic posts and general attitude here and in other posts. It's also not a unique event and he has been warned before as well as getting a 3 day vacation not long ago. Once you have a history of problems and the same behavior persists, the response tends to be quicker.

Now, let's let this be the absolute last OT post on the matter. This thread has already been taken into the toilet and I will delete ANY further OT post placed on this thread. If you have questions like this, it should go in Feedback forum, PMs or someplace besides a tech thread. I only put my comment here so that any others who are inclined to instigate and provoke problems could see the warning as well. Lets keep the tech forums for tech and leave the playground squabbles in the Lounge where they belong.