New Ford Boss 302 Block - Ford Muscle Forums : Ford Muscle Cars Tech Forum
Reply
 
LinkBack Thread Tools
post #1 of 16 (permalink) Old 02-05-2008, 08:00 PM Thread Starter
Registered User
 
Join Date: Feb 2007
Posts: 21
New Ford Boss 302 Block

Im getting some bad feedback on this block. There saying that this new Boss block should not be stroked to a 347 because of the SHORT cylinder walls on the bottom. Machine shops are saying that the piston skirts are coming out way to much and it would be risky even a 331 stroker.

COMMENTS PLEASE!!!

65 Mustang convert. Mexican block 302 stroked to 347 with Edelbrock RPM heads, Comp cams #35-518-8 roller cam, victor intake Holley TBI commander 950-21s fuel injection system with forced induction by Novi 2000 supercharger and bottle fed NOS up to 350 ponies.
BUSH is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 02-05-2008, 09:02 PM
Registered User
 
Join Date: Apr 2005
Posts: 865
Re: New Ford Boss 302 Block

That is all B---- S----/ The cylinders are all the same as the stock 302 blocks. I built one with a 3.50 stroke, NO PROBLEMS

JOE SHERMAN RACING ENGINES
BIGJOE is offline  
post #3 of 16 (permalink) Old 02-06-2008, 07:06 AM
Registered User
 
Join Date: Jan 2003
Posts: 399
Re: New Ford Boss 302 Block

Someone's yankin' your chain.

As mentioned by Joe, the cylinder dimensions are the exact same as any other 302. The new BOSS 302 block is very well built for the money.

Dave
\'87 5.0 LX Hatch, 5-speed
Maximum Motorsports suspension
Cobra brakes
CHP 347
87stang is offline  
 
post #4 of 16 (permalink) Old 03-11-2008, 09:09 PM
Registered User
 
Join Date: Feb 2008
Posts: 18
Re: New Ford Boss 302 Block

Cool thanks for the info, found the makings of a stroker kit with clev pitons, should net 10.6 comp, would like a tad more but it will work, now I just need some info from those crazy falcon guys ( boss 302 in a 64 ht who would of thought) thanks Brad
carcowboy is offline  
post #5 of 16 (permalink) Old 03-11-2008, 09:23 PM
Registered User
 
Join Date: Mar 2008
Posts: 294
Re: New Ford Boss 302 Block

I think someone is confusing your block with a 289 block. I wouldn't stroke a 289 block due to the shorter cylinder walls, but unless I'm mistaken the only difference in a boss 302 block is two more bolts on each main, and possibly different water passages for the cleveland type heads. Valve to piston clearance might be an issue, but I don't think skirt length is.

Last edited by doug351; 03-11-2008 at 09:25 PM.
doug351 is offline  
post #6 of 16 (permalink) Old 03-12-2008, 07:37 AM
Tech Contributor
 
Join Date: Jan 2002
Location: Ontario,Canada
Posts: 6,662
Garage
Re: New Ford Boss 302 Block

Quote:
Originally Posted by doug351 View Post
I think someone is confusing your block with a 289 block. I wouldn't stroke a 289 block due to the shorter cylinder walls, but unless I'm mistaken the only difference in a boss 302 block is two more bolts on each main, and possibly different water passages for the cleveland type heads. Valve to piston clearance might be an issue, but I don't think skirt length is.
Apparently this is not even true for the majority of 289 blocks..I've heard some very early 289 blocks had slightly shorter cylinder walls but the vast majority are the same as the 302.


1968 mustang 408W Hybrid..Burns gas and rubber!
[email protected] with a crappy 1.72 60ft.
frdnut is offline  
post #7 of 16 (permalink) Old 03-12-2008, 07:43 AM
Registered User
 
Join Date: Feb 2006
Location: North America......
Posts: 3,233
Re: New Ford Boss 302 Block

What Joe Said, Sounds like your Talking to a Chevy guy........

"2010 New Years Resolution - Break into the 15's with a JA Custom Cam and Buy a New AMERICAN Truck"

Screw Auto Forums......
dfree383 is offline  
post #8 of 16 (permalink) Old 03-12-2008, 03:35 PM
Registered User
 
Join Date: Mar 2008
Posts: 294
Re: New Ford Boss 302 Block

Quote:
Originally Posted by frdnut View Post
Apparently this is not even true for the majority of 289 blocks..I've heard some very early 289 blocks had slightly shorter cylinder walls but the vast majority are the same as the 302.
Well, I guess I learned something. Thanks fordnut, to create the 302, the stroke was lengthened .019, so the cylinder walls were lengthened by that much. It makes sense that Ford would then use the new, longer blocks to continue the 289's, something that didn't occur to me.
doug351 is offline  
post #9 of 16 (permalink) Old 03-12-2008, 05:46 PM
Registered User
 
Join Date: Jun 2006
Posts: 991
Re: New Ford Boss 302 Block

The bores are substantially shorter .300+ shorter

FordStrokers.com : Owner
SBFTech.com : Owner
Quickly Becoming The Largest CHP/Probe Dealer
woody1 is offline  
post #10 of 16 (permalink) Old 03-12-2008, 06:48 PM
Registered User
 
Join Date: Mar 2008
Posts: 294
Re: New Ford Boss 302 Block

woody1- I am an idiot in training, but I'm getting a little more edumacated each day. I must rely on the printed word for much of the dribble I spout, and that is only as good as the rube putting it on paper. I can't argue with you because I have no personal knowledge one way or the other. For the mean time, I'll take your word, and logically it makes a lot of sense, because of the talk of skirt slap. The greater the difference, the more that makes sense. (Yet another question to research to verify ). Thanks for the info.
doug351 is offline  
post #11 of 16 (permalink) Old 03-12-2008, 10:32 PM
Registered User
 
Join Date: Jun 2006
Posts: 991
Re: New Ford Boss 302 Block

Quote:
Originally Posted by doug351 View Post
woody1- I am an idiot in training, but I'm getting a little more edumacated each day. I must rely on the printed word for much of the dribble I spout, and that is only as good as the rube putting it on paper. I can't argue with you because I have no personal knowledge one way or the other. For the mean time, I'll take your word, and logically it makes a lot of sense, because of the talk of skirt slap. The greater the difference, the more that makes sense. (Yet another question to research to verify ). Thanks for the info.
No need to verify, I wouldnt give you bad info

last pic on this page

Login

FordStrokers.com : Owner
SBFTech.com : Owner
Quickly Becoming The Largest CHP/Probe Dealer
woody1 is offline  
post #12 of 16 (permalink) Old 03-13-2008, 11:40 AM
Registered User
 
Join Date: Feb 2006
Location: North America......
Posts: 3,233
Re: New Ford Boss 302 Block

Fords own Instructions recommends a maximum stroke of 3.4..........4.125 bore with a 3.4 stroke crank = 363 Inches...........

"2010 New Years Resolution - Break into the 15's with a JA Custom Cam and Buy a New AMERICAN Truck"

Screw Auto Forums......
dfree383 is offline  
post #13 of 16 (permalink) Old 09-02-2009, 01:00 PM
Registered User
 
Join Date: Jul 2007
Posts: 12
Re: New Ford Boss 302 Block

Quote:
Originally Posted by BIGJOE View Post
That is all B---- S----/ The cylinders are all the same as the stock 302 blocks. I built one with a 3.50 stroke, NO PROBLEMS

JOE SHERMAN RACING ENGINES
BIGJOE

Hate to beat a dead horse, but is there a final answer on the new Boss block and maximum stroke?

Mike
mike69 is offline  
post #14 of 16 (permalink) Old 09-02-2009, 01:13 PM
Registered User
 
Join Date: Apr 2001
Location: Central West Virginia
Posts: 7,348
Re: New Ford Boss 302 Block

Quote:
Originally Posted by mike69 View Post
BIGJOE

Hate to beat a dead horse, but is there a final answer on the new Boss block and maximum stroke?

Mike
This has been discussed in many threads.

BIGJOE was thinking about the old 1969-70 Boss 302 block.

The -NEW- Boss block does indeed have shorter cylinders. Stock 289/302 cylinders are between 5" and 5-1/8" long. They screwed up when they designed the new block and only made them 4.75" long. The 289/302 block already has some of the shortest cylinders out there, and shortening them like that has a good 1/4" of the piston pin hanging out of the bottom of the bore at BDC when a 3.4" (347) stroke is used. Therefore, the piston has very little support at BDC, rocks a lot, and can cause problems.

I believe Ford Racing is now pushing a 3.100" stroke 4.125" bore engine with this block that is supposed to measure around 331ci.

Buy a Dart Sportsman or a Dart SHP. Stay away from the defective Ford Boss 302 block.

Good Luck!
n2omike is offline  
post #15 of 16 (permalink) Old 09-02-2009, 02:44 PM
Registered User
 
Join Date: Apr 2005
Posts: 865
Re: New Ford Boss 302 Block

From what I have seen, the NEW Boss 302 block DOES have shorter cylinders where they come down into the crankcase area. They are about 125 ( one eighth inch ) SHORTER than a stock 289 or 302 passenger car block.. I would NOT use one for this reason alone, when you can buy a Dart block for a few hundred dollars more with longer cylinders. Some one sent me a 3.35 stroker in one of these new Boss 302 blocks.. It looks kind of scarry, but it did run allright

JOE SHERMAN RACING
BIGJOE is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Muscle Forums : Ford Muscle Cars Tech Forum 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 for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
New Boss 302 Block Coming From Ford: F15Falcon The Garage 11 07-20-2009 06:36 AM
BOSS 429 heads on 460 block? daboss460 All Ford Techboard 30 12-23-2008 06:01 AM
New 8.20 sbf boss racing block vs worlds block stoker All Ford Techboard 35 12-06-2006 09:23 PM
boss 302 block austfairmont66 All Ford Techboard 5 01-29-2002 03:14 PM

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