383 chevy stroker - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #16 (permalink)  
Old 04-27-2010, 09:19 PM
Registered User
 
Last photo:
Join Date: Apr 2010
Location: Sand Rock
Posts: 392
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by my87Z
first what are the heads, i looked up any GM small block head's who's casting numbers ended in 450 and all i come up with is 176450 used on 262 and 305 in 75'-76' and 367450 used on 262,267, and 305 in 75'-81' and to let you know that during this time neither of these motors even made 150hp, the 262 was actually rated at 110hp in 75-76' so that should tell you something about the heads that you are trying to work with.

you're gonna be no where near 500hp, maybe 350-360hp if you can get those heads to flow about 220cfm at your max lift

now before trying to pick a cam you need to know what pistons you are using and what the negative cc is in the piston crown so you can pin point compression with a .040" quench and what ever compression ratio you're gonna get. basically you need to know your compression ratio first then you can look for a cam, you also need to take into account what the motor is going into (weight), what gears will be used, what stall you plan on using, and what is the intended use of the vehicle. next i would question why you would use a hydraulic flat tappet cam with so much duration and lift, personally i wouldn't use a hyd f/t cam with anything over .480" lift and no more than 230 duration @ .050, past that i would look into a solid f/t cam, now if you have the money then you should look into running a hydraulic roller cam, with the 305H's cam specs on a roller cam that would be possible, but i think that the cam you have picked will have this 383 turing 6500+rpm (well past what the heads could handle) and the hyd f/t lifters will end up failing, not to mention the cam lobes. and then you mention a 600cfm carb for a 383 turing 6500rpm (which this is what the cam you picked will want to have it running) you will need at least a 750 but i would certainly recomend a 825-850 carb. you seriously need to research what you want to do, and find some real combinations, cause what you have listed here is awfull
and the nums on the 305 heads are "378450"!!the 355 13:1 motor i was talkn about run on purley compression thats where it made its power to run in the low 7's (its possible)!!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 04-27-2010, 10:08 PM
my87Z's Avatar
Veteran/Firefighter-EMT-I CRT
 
Join Date: Mar 2009
Location: maryland
Age: 30
Posts: 1,685
Wiki Edits: 0

Thanks: 6
Thanked 11 Times in 11 Posts
okay i just looked up the heads they are from 78-85 305's, they were originally maufactured with 1.72int/ 1.50exh valve. chevy never produced a 1.88 intake valve for a SBC head, nor does any of the aftermaket valve makers. chevy did however produce BBC heads with 1.88 exh valves. chevy did produce heads with 1.84 intake valves though.

now a 355 with a .480" lift cam no matter what the compression will not be able to make 500+hp, the .480" lift cam will not turn the motor up to the needed rpms to make that kind of power. the added compression will help to make more power but not that much. look at it this way a 355 with a typical .480" lift cam and about 9.5:1 and a mildly decent flowing set of heads will only make about 350-360hp the added compression to 13:1 would probably jump you up to about 430-440hp, but in a heavy car like a chevelle (3400+lbs + driver) would need about 525+hp and some serious rear gears and a heck of a stall to run a 7.00-7.20 in the quarter. but since you say this motor only had .480" lift cam then it should have only had about a 2500 stall in it

i have seen a couple of 7 sec 1/8 - 11 sec 1/4 cars running a 305 head but they were always the better 4416 305HO heads, and the people i saw running them were experiance head workers so they didn't have to pay the $$$ bucks it took to make them flow what they need to get about 500hp.

who ever put this .480" lift cam i a motor with 13:1 compression was certainly not someone i would consider to be a smart engine builder. a .480" lift cam doesn't have anywhere near the amount of overlapping duration you would want when running such compression. i dont think i would trust a word this person said. i've seen novices put better combos together than that
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 04-27-2010, 10:20 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,602
Wiki Edits: 326

Thanks: 701
Thanked 891 Times in 758 Posts
He's just shinin' ya on Z and havin' a good time doin' it. As long as you keep tryin' to make sense to him, he'll keep feedin' ya fuel.....
Reply With Quote Quick reply to this message
The Following User Says Thank You to techinspector1 For This Useful Post:
my87Z (07-27-2012)
  #19 (permalink)  
Old 04-27-2010, 10:28 PM
my87Z's Avatar
Veteran/Firefighter-EMT-I CRT
 
Join Date: Mar 2009
Location: maryland
Age: 30
Posts: 1,685
Wiki Edits: 0

Thanks: 6
Thanked 11 Times in 11 Posts
Quote:
Originally Posted by techinspector1
He's just shinin' ya on Z and havin' a good time doin' it. As long as you keep tryin' to make sense to him, he'll keep feedin' ya fuel.....

i think you might be right Tech 1, why does it seem that i always get these guys and i try to explain how things "ACTUALLY" work but yet they just wont listen.

Reply With Quote Quick reply to this message
  #20 (permalink)  
Old 04-27-2010, 10:32 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,602
Wiki Edits: 326

Thanks: 701
Thanked 891 Times in 758 Posts
Quote:
Originally Posted by my87Z
i think you might be right Tech 1, why does it seem that i always get these guys and i try to explain how things "ACTUALLY" work but yet they just wont listen.

You've got a good heart Z and will get your reward in another astral plane.
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 04-27-2010, 11:33 PM
#!new's Avatar
406C-10
 
Last photo:
Join Date: Apr 2010
Location: south carolina
Posts: 23
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I had a 406 with a descent set of alum heads, and a hydr roller cam with .558 lift and 250 dur. And it only made 430 hp at the flywheel. It's harder to make 500 hp than you think.
Reply With Quote Quick reply to this message
  #22 (permalink)  
Old 04-28-2010, 09:18 AM
my87Z's Avatar
Veteran/Firefighter-EMT-I CRT
 
Join Date: Mar 2009
Location: maryland
Age: 30
Posts: 1,685
Wiki Edits: 0

Thanks: 6
Thanked 11 Times in 11 Posts
Quote:
Originally Posted by #!new
I had a 406 with a descent set of alum heads, and a hydr roller cam with .558 lift and 250 dur. And it only made 430 hp at the flywheel. It's harder to make 500 hp than you think.

to be honest with you there must have been something wrong with your combination, cause as long as the heads could keep up with the motor this should have made 500+hp. i've got a 385 stroker with less cam (240/250 @ 050 and .555"int/ .521"exh) and i'm making just a touch over 500, but i have a really good set of DART iron heads with work done to them as well, without all the work i had done to them there is no way i would have hit 500hp, maybe 475hp
Reply With Quote Quick reply to this message
  #23 (permalink)  
Old 04-28-2010, 09:38 AM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 8,717
Wiki Edits: 0

Thanks: 17
Thanked 289 Times in 269 Posts
Quote:
Originally Posted by gofastz
and the nums on the 305 heads are "378450"!!the 355 13:1 motor i was talkn about run on purley compression thats where it made its power to run in the low 7's (its possible)!!
purely compression... because 13:1 is the only number you need to go fast.
Reply With Quote Quick reply to this message
The Following User Says Thank You to ap72 For This Useful Post:
my87Z (07-27-2012)
  #24 (permalink)  
Old 04-28-2010, 09:51 AM
my87Z's Avatar
Veteran/Firefighter-EMT-I CRT
 
Join Date: Mar 2009
Location: maryland
Age: 30
Posts: 1,685
Wiki Edits: 0

Thanks: 6
Thanked 11 Times in 11 Posts
AP what are you trying to say man
Reply With Quote Quick reply to this message
  #25 (permalink)  
Old 04-28-2010, 10:41 AM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 8,717
Wiki Edits: 0

Thanks: 17
Thanked 289 Times in 269 Posts
basically that he would be better off if he knew nothing about cars than what he "knows" now- which is just enough to be dangerous.

No engine can run purely on compression. I feel dumber for even saying "purely on compression".
Reply With Quote Quick reply to this message
  #26 (permalink)  
Old 04-28-2010, 10:44 AM
my87Z's Avatar
Veteran/Firefighter-EMT-I CRT
 
Join Date: Mar 2009
Location: maryland
Age: 30
Posts: 1,685
Wiki Edits: 0

Thanks: 6
Thanked 11 Times in 11 Posts
okay i just wanted to clarify that
Reply With Quote Quick reply to this message
  #27 (permalink)  
Old 04-28-2010, 03:13 PM
Registered User
 
Last photo:
Join Date: Apr 2010
Location: Sand Rock
Posts: 392
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
ok lol 4 those that dont know when i say "compression motor" i mean no power adders, now sayn that i was talkn 8th mile not 1/4, but 4 the chevy power unbeleavers, i tell you what im going to do, forget about the 383 and go back to the 355 combo with the "305" heads sence we still have the 355 on the stand ill just put them back together, but the 65' chevelle is long gone but i do have a 87' cutlass with a turbo 350 with 4:10's to turn the tires over, and ill run it in the 1/4 and see what i have! but until somebody wants to drop some race heads my way, the 305 heads will continue there service!!
Reply With Quote Quick reply to this message
  #28 (permalink)  
Old 04-28-2010, 04:34 PM
my87Z's Avatar
Veteran/Firefighter-EMT-I CRT
 
Join Date: Mar 2009
Location: maryland
Age: 30
Posts: 1,685
Wiki Edits: 0

Thanks: 6
Thanked 11 Times in 11 Posts
i understand that you were talking the 1/8 and not the quarter and i know more about 1/4 mile racing but in order to run the 1/4 you have to run the 1/8 first and both times come on your slip, i also know that typically a car that is running low 7's in the 1/4 is typically running low 11's in the quater.

and i'm no unbleiver in chevy, that is all i have ever run before, i have help a guy build a 347 stroker for his fox body but other than that it's been all chevy. i run a .040 over stroked 350, it's a 385ci with a mild solid cam, and a set of worked over DART platinum iron heads in a 3500lb car, she runs 11.60's in the quarter (i still think with practice and tuning i can get into the lower 11's) but still what ever.

look for some good used iron heads on the internet, you can probably find a set on ebay or craigslist for around 300-400.00, if you have the time before this will all come together then this is the route i would take.

if you have more questions, or just need some guidence on what might be a good combo (trust me you do) then dont be afraid to ask
Reply With Quote Quick reply to this message
  #29 (permalink)  
Old 04-28-2010, 04:59 PM
Registered User
 
Last photo:
Join Date: Apr 2010
Location: Sand Rock
Posts: 392
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by my87Z
i understand that you were talking the 1/8 and not the quarter and i know more about 1/4 mile racing but in order to run the 1/4 you have to run the 1/8 first and both times come on your slip, i also know that typically a car that is running low 7's in the 1/4 is typically running low 11's in the quater.

and i'm no unbleiver in chevy, that is all i have ever run before, i have help a guy build a 347 stroker for his fox body but other than that it's been all chevy. i run a .040 over stroked 350, it's a 385ci with a mild solid cam, and a set of worked over DART platinum iron heads in a 3500lb car, she runs 11.60's in the quarter (i still think with practice and tuning i can get into the lower 11's) but still what ever.

look for some good used iron heads on the internet, you can probably find a set on ebay or craigslist for around 300-400.00, if you have the time before this will all come together then this is the route i would take.

if you have more questions, or just need some guidence on what might be a good combo (trust me you do) then dont be afraid to ask
cool stoker , keep workn it, i got a buddy at work run 7.10's n tne 8th in a fox body, 355 with bowtie stage 2 heads no power adder, but hey im just going to use the 355 combo i have til i can some better heads that was my plann anyway bc i know i can get more hp w better heads, 305 heads with 1.88's or 1.84's whatever one of the two, not much valve there, but it has the ports when i first seen them i said wow at the ports i wonder what they would do?but yeah ill look around for some nice race heads like sportsman 2's or alittle bigger!
Reply With Quote Quick reply to this message
  #30 (permalink)  
Old 04-28-2010, 05:14 PM
my87Z's Avatar
Veteran/Firefighter-EMT-I CRT
 
Join Date: Mar 2009
Location: maryland
Age: 30
Posts: 1,685
Wiki Edits: 0

Thanks: 6
Thanked 11 Times in 11 Posts
bigger is not the key remember, it's acutally as small as you can get them but still maintain as much flow as possible, remember you want both air flow and velocity at lower lifts, on a 350 used on the street there is no real need for any bigger than about 170-180cc intake runner, once you go over that you will start to sacrifice low end for high end, and you dont want this on the street. i'm not a fan of sportsman heads, they used to be a staple in the racing community but when you actually had them tested they didn't do so well, the newer ones are a little better but i just stay away from them all together. a great head for you would be the RHS 170 pro torker, or if you ended up using a cam with over 230 degrees @ .050 i would say look into their 180 pro action heads

here look at these, they are vortec style heads but yet you can use the regular bolt patten intake on them, with these you wouldn't have any problem making 400-415hp with the right cam. and you can't beat the price either.

http://www.competitionproducts.com/R...fo/RHS12410K1/

or look at these, with a little more cam and these heads you could easily work into about 440-460hp

http://www.competitionproducts.com/R...fo/RHS12317K1/

either of these heads on the engine you want to build will blow those 305 heads away, we're talking about an easy 60-100hp from just using these heads of the 305 ones you have and that is on the belief that they actually flow ok
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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 for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Chevy 383 Stroker timing Hotrodder78 Engine 4 03-15-2009 11:15 PM
chevy 383 stroker for sale thefloyd1973 Engine 3 04-07-2007 05:57 PM
383 chevy small block stroker ZAPP59 Engine 4 02-24-2006 09:36 AM
I need your feedback Specs for my new 383 stroker ozzt Engine 12 01-11-2006 10:12 AM
chevy production 383 ronb Engine 21 01-05-2003 01:24 PM


All times are GMT -6. The time now is 09:50 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.