4.75 stroke in a 10.2 Bowtie block - Yellow Bullet Forums

Go Back   Yellow Bullet Forums > Technical Section > Naturally Aspirated - Uratchko Racing Engines

Naturally Aspirated - Uratchko Racing Engines

Reply
 
Thread Tools Display Modes
Old 10-26-2007, 10:01 PM   #1
Ryan71nova
Junior Member
Spooled up
 
Join Date: Oct 2007
Location: Hartford Kentucky/Watfordcity nd
Posts: 170
Default 4.75 stroke in a 10.2 Bowtie block

How much cuting do you have to do to get a 4.75 stroke crank in a 10.2 deck bowtie block.Also would it be practicul to run 6.7 length rods.Going to be a nos engine.Thanks Ryan
Ryan71nova is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-28-2007, 08:59 AM   #2
Ryan71nova
Junior Member
Spooled up
 
Join Date: Oct 2007
Location: Hartford Kentucky/Watfordcity nd
Posts: 170
Default

Any body got any info on doing this just wanting to know if it would work better with 4.500 or a 4.750 stroke thanks Ryan
Ryan71nova is offline   Reply With Quote
Old 10-28-2007, 09:55 AM   #3
excelerater
Senior Frog
Smoked Another SBC
 
excelerater's Avatar
 
Join Date: Oct 2006
Location: Memphis,TN
Posts: 10,020
Default

split the difference 4.625
excelerater is offline   Reply With Quote
Old 10-28-2007, 12:37 PM   #4
MR HORSEPOWER
Junior Member
Pre-Staged
 
MR HORSEPOWER's Avatar
 
Join Date: Oct 2007
Location: michigan
Posts: 83
Default

IT ALL DEPENDS ON WHAT CUBIC INCH YOU WAN'T?IS YOUR BLOCK A REGULAR BOTIE,OR CNC BOWTIE BLOCK?4.750 CAN BE DONE WITH NO PROBLEM.I CAN GIVE YOU EXACT NUMBER'S TO MACHINE TO ON A BRIDGEPORT IF YOU LIKE.


REGARDS
MR HORSEPOWER is offline   Reply With Quote
Old 10-28-2007, 03:26 PM   #5
Ryan71nova
Junior Member
Spooled up
 
Join Date: Oct 2007
Location: Hartford Kentucky/Watfordcity nd
Posts: 170
Default

It is a cnc bowtie block 4.560 bore.
Ryan71nova is offline   Reply With Quote
Old 10-28-2007, 09:08 PM   #6
Ed-vancedEngines
Senior Member
Smoked another BBC
 
Join Date: Mar 2006
Location: Temp location. In a bed in McKinney, Tx. Call anytime on Cell 972-464-7400
Posts: 2,898
Default

You should be able to do that stroke but is it worth all the work? I too suggest the 4.625 instead. I most definitely do not like that long of a rod with a 4.750 stroke in a 10.200 block. Where are you going to put your pistons? By the time you do that stroke and that rod the pistons will eithe rbe far too short or sticking far above the deck.

Tell me what Head and valve angle and I will tell you a suggestion based on many years experience of how short your piston can be. Also is this for NOS or gasoline?

Do you have a GM Part # for that block or a Casting number? All of the Bow Tie Blocks are not the same?

Ed
Ed-vancedEngines is offline   Reply With Quote
Old 10-29-2007, 12:16 AM   #7
MR HORSEPOWER
Junior Member
Pre-Staged
 
MR HORSEPOWER's Avatar
 
Join Date: Oct 2007
Location: michigan
Posts: 83
Default

YOU STILL HAVE TO CUT THE BLOCK QUITE A BIT TO GET A 4.625 STROKE INTO A BOWTIE BLOCK WITH ALUMINUM RODS,EVEN STEEL RODS.I WOULD NOT USE A 6.700 ROD ,DO TO THE FACT THAT IT LEAVE'S YOU WITH A UNDESIRABLE RING STACK UP,BUT CAN BE DONE MORE SO FOR AN N\A ENGINE.I HAVE PERSONALLY BUILT OVER 40 632'S OUT OF 10.200 BOWTIE BLOCK'S THAT MAKE GREAT POWER AND LIVE JUST FINE WITH MY PERSONAL COMBO.




REGARDS,
MR HORSEPOWER is offline   Reply With Quote
Old 10-29-2007, 07:24 AM   #8
Ryan71nova
Junior Member
Spooled up
 
Join Date: Oct 2007
Location: Hartford Kentucky/Watfordcity nd
Posts: 170
Default

It is going to be nos engine I am spraying my current combo with 40 jets in nos pro race fogger going to have two foggers on this engine.As far as heads my engine right now has bb2extras on it thinking of going to the 405 BMF for this engine.Wanting the compression ratio to be around 14.1.I will get the casting number some time today off it litte cold to walk out to the garage this morning. How long of a rod would you all use.It is not set in stone to put a 4.75 stroke in it.I have not bought a crank yet or rods.I am going to start working on this combo here pretty quik for next season.I am wanting to try and get between 950 to 1000 hp on the motor that would be 100 to 150 hp stronger than my current engine.ThanksRyan
Ryan71nova is offline   Reply With Quote
Old 10-29-2007, 06:45 PM   #9
Ryan71nova
Junior Member
Spooled up
 
Join Date: Oct 2007
Location: Hartford Kentucky/Watfordcity nd
Posts: 170
Default

The block is a 14044807 cnc mark4 tall deck bowtie block
Ryan71nova is offline   Reply With Quote
Old 10-30-2007, 10:42 AM   #10
joesmithz28
Senior Member
Smoked another BBC
 
Join Date: Feb 2007
Location: Naval Base Kitsap
Posts: 1,005
Default

I'd use a 4.625" stroke max. If you're really gonna lean on the kits, then 4.500" would be better so you can build a better piston.
joesmithz28 is offline   Reply With Quote
Old 10-30-2007, 11:03 AM   #11
Ed-vancedEngines
Senior Member
Smoked another BBC
 
Join Date: Mar 2006
Location: Temp location. In a bed in McKinney, Tx. Call anytime on Cell 972-464-7400
Posts: 2,898
Default

Gen IV bloack = 4.560 maximum bore. I agree 4.500 or 4.625 stroke.

Ed
Ed-vancedEngines is offline   Reply With Quote
Old 10-30-2007, 11:18 AM   #12
Outlaw Bill
Senior Member
Smoked Another SBC
 
Outlaw Bill's Avatar
 
Join Date: May 2005
Location: Canton, Mich
Posts: 5,543
Default

I would go with the 4.500 stroke, it will give you more room to have the correct piston designed.
__________________
TeamZmotorsports Stock Suspension 25.3 Outlaw Drag Radial 1991 Mustang
http://www.teamzmotorsports.net/category_s/166.htm

Thank you to the following-
TeamZmotorsports
Marcella Manifolds
Schoneck Composites
Ultimate Converter Concepts

http://www.hardcore50racing.com/vbulletin/index.php
Outlaw Bill is offline   Reply With Quote
Old 10-30-2007, 11:40 AM   #13
NOS-Nelson
Procharger Power
Smoked Another SBC
 
NOS-Nelson's Avatar
 
Join Date: May 2007
Location: On my Gixxer, bitch
Posts: 23,771
Default

Quote:
Originally Posted by Outlaw5.0 View Post
I would go with the 4.500 stroke, it will give you more room to have the correct piston designed.
Yeah what he said.
NOS-Nelson is offline   Reply With Quote
Old 10-30-2007, 12:18 PM   #14
Camaro632
Junior Member
Burnout box
 
Join Date: Jul 2007
Posts: 5
Default

Had no problems with a Dart Big M 10.2 using the 6.7 rod and 4.75 stroke. I do not know if the pan rails etc. are similar in thickness. There was adequate material at both the pan rail and the bottom cylinder wall for grinding purposes.
This motor has been used with mild nitrous, 150-300 with no problems.
Camaro632 is offline   Reply With Quote
Old 10-30-2007, 12:43 PM   #15
Ryan71nova
Junior Member
Spooled up
 
Join Date: Oct 2007
Location: Hartford Kentucky/Watfordcity nd
Posts: 170
Default

The block is at standard 4.500 right now I thought you good bore it out 125 over may be mistaken.I am looking to spray it with two foggers no more than 32 jets in both.Thanks Ryan
Ryan71nova is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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



All times are GMT -4. The time now is 07:54 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Resources saved on this page: MySQL 2.99%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Yellow Bullet LLC