307 stroker question - 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
  #1 (permalink)  
Old 04-10-2003, 11:23 AM
Registered User
 
Join Date: Apr 2003
Location: Dover, Pa.
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post 307 stroker question

I have a 307, What I plan on doing is putting a 350 crank with 400 rods and 327 flattop pistons. The question is after I have it bored out to 4", What will the displacement actually be? I have'nt picked out a cam yet, I am looking for some camel hump heads to put on it. I know everyone will ask why use a 307 I just happen to have it around my garage and wanted to do something with it. I also would like to know what is the deck height on a small block from crank centerline to deck height? I guess it would be the same on all small blocks. Thanks will be watching for replys.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-10-2003, 12:22 PM
Member
 
Last photo:
Join Date: Sep 2002
Location: Halifax, NS
Age: 34
Posts: 108
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Small-block chevy deck height is 9.025". Have you checked the block to see if it can be bored out that far? A 1/8" overbore is highly unlikely. If by chance you could bore it out that far, just use 5.7" rods and 350 pistons. Run a search for "307", there should be a few posts out there.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-10-2003, 12:40 PM
Member
 
Join Date: Oct 2002
Location: Medicine Hat,Alberta
Posts: 179
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

what a 307 is,is a 283 block and a 327 crank.now at a 4.00" bore and a 3.25",you have a 327.with a 350 crank that has a 3.48" stroke it will be a 350.the formula that i use is;bore x bore x srtoke x .7853 x # of cylinders.it usually is very accurate. 400 rods are 5.565 center to center.
__________________
Foot to the floor,hair back,knuckles white.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-10-2003, 12:47 PM
Member
 
Join Date: Jan 2003
Location: SE OHIO
Posts: 54
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Well when your done boring the 307 to 4 inch(unlikely you will be able to) and put a 350 crank in, you will have a 350. Using 400 rods is not a good thing either. They are shorter than the 350 rods and longer rods are more desirable. Your combination could work but it would be alot easier to start with a 350.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-10-2003, 01:46 PM
M&M CUSTOM's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Transmission identification
Last journal entry: 1988 Suburban, the project continues.
Last photo:
Join Date: Mar 2003
Location: Northwest Pennsylvania.
Age: 43
Posts: 2,231
Wiki Edits: 9

Thanks: 0
Thanked 1 Time in 1 Post
Post

You are starting with an engine bore of 3.875 inches.
Over-boring this block .125 inch (1/8") will be a waste of your machine shops' time and your money.
Most cast iron block engines will support a maximum .060 (1/16") overbore and no more.
If your machinist wants to attempt this project and succeeds in a clean overbore in every cylinder you will have cylinder walls in places that you could measure distortion with a dial indicator while pushing on them with just your finger.
Now take the fact this engine doesn't run YET.
Add roughly 125 static PSI compression, with fuel mixed in that air pressure.
Next, explode that!!!!!!!!!!
In our vo-tech auto mechanic class we had the opportunity to see this demonstration done, and that for me was 15 years ago.
Your original post indicated you wanted a 350? You already have a "327" crankshaft, go for that, just remember Chevy made some STRONG 327's from the factory.
Also with your posted setup 327 pistons, 400 rods, and 350 crank, your pistons are .23 inche longer than a 350 and your 400 rods are .135 inch shorter than the same said 350.
Your pistons will then at top dead center extend past the deck .095 inch <img src="graemlins/pain.gif" border="0" alt="[pain]" />
You will definitely need to get a 350 block though.
I for one hope you have a plan "B".
And if you would like to send a PM I might be able to help you out, <img src="graemlins/mwink.gif" border="0" alt="[mwink]" /> you are only located about 5 hours from here if my search engine is right.

[ April 10, 2003: Message edited by: M&M CUSTOM ]</p>
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-10-2003, 03:49 PM
bluesman123's Avatar
Member
 
Last photo:
Join Date: Nov 2002
Location: Bay Area, California
Age: 68
Posts: 593
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Wink

I guess this is sort of related to the topic, but why did the 307 never get popular? Is there something wrong with the bore/stroke ratio or something? Why is it such an apparent dog (no offense Fido!) compared to the 302?

Speaking of dogs...what happened to your pup, 4Jaw? It was pretty cool. You didn't actually eat it did you?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-10-2003, 04:05 PM
Member
 
Last photo:
Join Date: Sep 2002
Location: Halifax, NS
Age: 34
Posts: 108
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

The 327 pistons (only 0.115 longer), 400 rods (0.135 shorter), and 350 crank would work, there's just not much point unless you already have 'em layin' around.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-11-2003, 07:20 AM
Member
 
Last photo:
Join Date: Nov 2002
Posts: 493
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Post

The 307 had very thick cylinder walls. 30 years ago, you would have fair odds in a 1/8" overbore. A failure rate of 1 in 10 because of porosity.

Today, the rate would be much higher. 30 years is a long time for water jacket corrosion to take place.

If you want a 4" bore....find a 4" bore block....


Stroking a 307, although odd by many, is doable. John Beck placed 3rd in the PHR Engine Masters Chalenge with a 307 based motor. A 305/350 crank with 400 rods and stock 307 pistons will get you a standard bore 328. 30, 40, and 60 over will get you a 333, 335, or 339. All in all, unless you have a good standard bore lock, a good set of 400 rods, and a 305 crank that doesn't need turning, you will be money ahead getting a 350 to start with. If you are building for a specific class, or are just doing a "Dare to be different" motor, the 307 may be for you. With the avalibility of 3.750" cranks, a 365 inch 307 can be built with a .060" overbore. 4.935" X 3.750". It would be something you don't see much, and the cylinder walls wouldn't be so thin as to cause problems.

I like the idea of doing something other than another 350. Of course, it's not me spending the money. My views would more than likely change if it was my wallet getting lighter. Dan
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 05-15-2003, 10:45 PM
Dale
 
Join Date: Nov 2002
Location: Minn.
Age: 53
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

You ask what is wrong with a 307 Chev engine. Basicly nothing,68-70 they were strong contenders.= to 283. 283=195 hp, 68-70 307=200 hp 71-73=110 hp. They only came with 2 bbl carbs. Later 307s had low compression and terible smog cams, which was there downfall.Hey 73-78 350s only had 110-125 hp with a 4 bbl carb! Do the normal hop up stuff,raise compression to 9.5 to 1 minimum, instal a good camshaft,4bbl carb, and duel exaust.With this combo you will be happy. You got the motor, run it. I love them, they are cheep and can run strong. There are a lot of "350"s out there that are really 307s,305s, or even,267s. they all look the same. dont let any one discorage you from running it. Remember talk is cheep when they are not paying the bill! I built a 262 chev smallblock,the smallest cid made cause "they "said it couldn't be done. I stroked it, ported the stock heads,cammed, it put a single 4bbl on it. It put out 250 hp when it was done. I put it in a 1979 monza, and nothing would touch it!It would burn rubber in all 4 gears!! So run it and enjoy you car. The money you save will buy a lot of gas!!!!!!!!!

[ May 16, 2003: Message edited by: dale w ]

[ May 16, 2003: Message edited by: dale w ]</p>
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 05-16-2003, 04:13 AM
EBlack36's Avatar
Rebuilt Excitment
 
Last photo:
Join Date: Aug 2002
Location: Lansing, Ks
Age: 62
Posts: 595
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

used to bore 283's out to a 4 inch bore to create a 301 CU IN and they seemed to work fine, My Brother had one in a 57 Chevy and it ran great. It never had heating problems of any kind. (This was 30 years ago). It was also called a poor man 302. I also built a 307 when I first put the 36 together, did a 3 angle valve job on it , a mild cam (the old 350hp profile) a corvette 4 barrel intake with an afb and block hugger headers. the car ran very well with this combo.

[ May 16, 2003: Message edited by: EBlack36 ]</p>
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:
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



All times are GMT -6. The time now is 03:02 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.