what might be best 350 400 383 or 373 - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old Mar 2nd, 01, 03:51 PM Thread Starter
 
Join Date: Feb 2001
Posts: 12
Post

I am a bracket racer from canada . I have a farly stout 350 to run on the 1/8 mile.10.1 compretion .508 lift cam,performer intake dule plain,and quad carb this ran my car to 8.4sec but as a true racer its not enough. my question is this . if having the choice in building a bigger 350 a 400 or merging the to into ether a 383 or 373 what would be best bang for the buck.i am thinking of 12.1 or 13.1 dome tops with open chamber heads i like the cam i have, and i am open to dule or single plain intakes . money is a small ishue some will cost more in the end . my first build up was under 1000$ .and i would like to keep this one under 2000$. so in your opinion if you could build these 4 motors to almost the same specs whitch one would kick the other 3 motors in the pants
Wildside is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old Mar 2nd, 01, 04:51 PM
 
Join Date: Apr 2000
Posts: 32
Post

give me the cubic inches i would build the 400 just my choice.
buddy c is offline  
post #3 of 13 (permalink) Old Mar 2nd, 01, 05:48 PM
Senior Tech
John
 
Join Date: Feb 2001
Location: Maine
Posts: 3,099
Post

the cubes of the 400 will get you more torque off the line, but the 377 with the shorter stroke will rev faster if the car can keep up with it. For the money, I would have the say the 400 is the best bet though.
boodlefoof is offline  
 
post #4 of 13 (permalink) Old Mar 2nd, 01, 05:52 PM
 
Join Date: Jun 2000
Location: Kahuku Hawaii USA
Posts: 20
Post

Why build a 383 if you can build a 400? The cranks are the same so the rpm potential of these two engines are similar.
You'll get more power out of a 400 just becase of the cubes.
I'm not sure about a 373, I've never heard of this displacement, do you mean 377? I'd still go with the most inches, especially if your budget is $2000.

G

[This message has been edited by Hp2x426 (edited 03-02-2001).]
Hp2x426 is offline  
post #5 of 13 (permalink) Old Mar 3rd, 01, 06:12 AM
 
Join Date: Jan 2001
Posts: 367
Post

Hp2x426
, your right, it's a 377.

It also depends on the weight of the car you have. If it's 2300 lbs, 377. Rap it up quick.

If the car is a little fatter, by all means, do a 406 if the block is in good order.

Good luck!

------------------
383 Speed-O-Motive stroker kit with Speed Demon 750, RPM intake,Proform HEI dist.MSD6a box,World Products Sportsman II heads, ported and polished with 2.02/1.60 valves,64cc,TRW forged pistons with 10.7:1 compression, Comp Xtreme 284 cam,Crane pushrods, Comp Cam 1.6 full roller rockers,ATI damper, 40 series Flowmasters, 4.11 gears with TH350 and 3000 stall.Powertrax NoSlip Locker
Tracy Focht is offline  
post #6 of 13 (permalink) Old Mar 3rd, 01, 03:54 PM Thread Starter
 
Join Date: Feb 2001
Posts: 12
Post

your right i ment 377 what was i thinking.and truth be knowen its to be instaled into a 300ZX so probibly a 2000lb to 2200lb car.
Wildside is offline  
post #7 of 13 (permalink) Old Mar 3rd, 01, 04:57 PM
 
Join Date: Jan 2001
Posts: 367
Post

I would do the 377.......my personal opinion, because you are pretty light already. So torque isn't the need.

Good luck either way.

------------------
383 Speed-O-Motive stroker kit with Speed Demon 750, RPM intake,Proform HEI dist.MSD6a box,World Products Sportsman II heads, ported and polished with 2.02/1.60 valves,64cc,TRW forged pistons with 10.7:1 compression, Comp Xtreme 284 cam,Crane pushrods, Comp Cam 1.6 full roller rockers,ATI damper, 40 series Flowmasters, 4.11 gears with TH350 and 3000 stall.Powertrax NoSlip Locker
Tracy Focht is offline  
post #8 of 13 (permalink) Old Mar 4th, 01, 06:40 PM
 
Join Date: Jul 2000
Posts: 233
Post

400 400 400 400 400 400 400 as long as you can keep it cool.
69er is offline  
post #9 of 13 (permalink) Old Mar 5th, 01, 08:00 PM
Tech Team
 
Join Date: Apr 2000
Location: Columbus, OH, USA
Posts: 65
Post

400's are awesome engines, I am building up one now. However they are more expensive to build up the bottom end by far, and the blocks are a lot harder to come by. I know a guy here in Ohio that has one that he's selling for $200 ready to go .040 if you live anywhere near...

If you are on a budget of less than 2 grand for the whole engine, you are in trouble, go with a 350... Also, I know Speedomotive sells kits to stroke a 350 up to a 391, but if you have a 300ZX or whatever, you will want a shorter stroke engine. The potential for that car with even a 350 is incredible.

If you are on a budget, find a short block 400 or complete engine that needs rebuilt, expect to pay $400-$500 unless you're lucky, use the stock crank and rods, trash the stock heads, but be sure to drill 400 steam holes in the new heads (search for older 400 posts about this). If you want to do it really well then use the longer and far superior 5.7" 350 rods. They just need a little clearancing to fit. and if you're doing this BE SURE to use 76cc heads becuse if you don't and you want any where near streetable compression ratio, your piston selection is minimal ($$$).

If you have a good donor engine for parts now you can build something killer for under $2,000. Use the 350 crank or go to Speedomotive.com and look at their stroker/destroker kits, some are really reasonably priced. The whole rotating assembly.
If you only are pushing 2300 lbs, the 400 itself is pretty light, you will have lotsa torque from the 377 cubes as is...

with 400's, if you are building a high rpm high hp engine try to stick with the 2 bolt blocks as opposed to the 4 bolt blocks. the 4 bolts aren't splayed main bolts, they go straight into the material between the clylinders instead of the two outside bolts going outward at 18 degrees. This causes them to crack easier there. And the longer rods (5.7) put less stress on the outside cylinder walls. I know a guy who said he ran 2 stock 400 short blocks and cracked both on the outside cylinder wall up the block vertically... Never heard this happening anywhere else but him. Also, the higher nickle and tin alloy blocks are stronger and can be distinguished by the casting numbers 010 and 020 under the timing chain. An 010 block will have tin in the alloy while the blocks with both numbers, 010 and 020, will have tin and nickle in the alloy. The nickle blocks are said to be the strongest of the 2 bolt blocks.
And of course install a Milodon 4 bolt main stud conversion kit if you are pushing serious hp. If under 475 the stock 2 bolts may be okay.

You will need a good 3 or 4 core radiator and be sure to hot tank the block really well to clean out the water jackets. I know there are a lot of other tricks out there to make the hot running 400's cool a lot better, like drilling an extra coolant hole in the deck and heads, and plugging up one of the two steam holes or something of that nature. Lots of weird mods to do to the block. Check out Lingenfelter's book on modifing Chevy small blocks, they discuss 400 head and block prep really well in there.

That's it for now, I have lots more 400 info if you need it. Check out Speedomotive's kits.



------------------
----------------------------
78 Camaro Z28 clone - 350hp/460ft/lbs 400 small block / TH350,
full poly suspension, 2" lowered, 1-1/4" & 1-1/8" sway bars
Chuck78 is offline  
post #10 of 13 (permalink) Old Mar 5th, 01, 08:07 PM
Tech Team
 
Join Date: Apr 2000
Location: Columbus, OH, USA
Posts: 65
Post

oh yeah, the 400 crank requires specific 400 balancer and flexplate, and the 400 flywheel.

The crank is externally balanced.

Scat also makes a lighter and really nice 400 crank, a lot better than the one in the speedomotive kits.

but go with the 377 for your application if possible.
Chuck78 is offline  
post #11 of 13 (permalink) Old Mar 6th, 01, 10:14 PM Thread Starter
 
Join Date: Feb 2001
Posts: 12
Post

hay chuck 78 thanxs for the info sound like you know some about the 400s. i have the complet 400 including the ballencer and flywheel.so that saves me allready. but question how do you use the 5.7 rods do i need special pistons? wont the stock ones push to far out of the block?streetable compretion is not an problem this motor wont see the street. and whats wrong with the 400 heads why scrap them? why are they different from a 350?the block is 2bolt from a 78 4x4. lastly i do have the parts to build any of these motors whitch in your opinion is the best?
Wildside is offline  
post #12 of 13 (permalink) Old Mar 7th, 01, 07:31 PM
 
Join Date: Mar 2001
Location: colleyville,texas usa
Posts: 4
Post

i thought the 383 was a real torque monster....for brackets i would say torque is key....but what do i know?
zilad is offline  
post #13 of 13 (permalink) Old Mar 7th, 01, 08:02 PM
 
Join Date: Oct 2000
Posts: 117
Post

i have a 400 small block real good motor at first we had problems kewling it but now its ok we put a 4 core and every thing new for the cooling system my car wieghs 3600 and it runs a mid 13 and a 8.9 -8th mile and so far here is what we done to it 4.10 gears a turboo 400 transmission with trans pack 3000 stall its bored 30 over with stock dish pistons and a 490 lift comp cam , rpm performer intake , headers and to top it off a 750 holley o yeh and some 3 inch exhaust if your going to just do 8th mile i would defiantly go with the 400 i love the way that thing takes off i have like a 1.7 60 ft not bad for a street car i bet my motor in that 300 z would run a 12.30 or something like that
camaro79tx is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome