Welcome to the THE H.A.M.B. forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Go Back   THE H.A.M.B. > General Discussion > The Hokey Ass Message Board

Reply
 
Thread Tools Display Modes
Old 11-10-2013, 12:30 PM   #1
Baumi
Alliance Member
 
Baumi's Avatar
 
Join Date: Jan 2003
Location: Landshut,Bavaria,Germany
Posts: 1,222
Default Buick guys:401/425 Nailhead and Parts interchangeability questions

I īm planning to run a 425 nailhead in my future drag rod project. I already have a beautiful std bore 425 block and a good crank, but the rods and pistons were not with the engine. Some my question is, can I use 401 rods in a 425 block? The stroke is identical at 3.64" but I donīt know if the 425 has the same rod length and compression height as the 401?

I couldnīt think of a reason why it shouldnīt be identical, but I just canīt find anything about that.Iīm dreaming of running a blower with mechanical fuel injection on it. I think a little boost would really help with these small valves and intake/ exhaust runners. How strong is the bottom end on these engines? How much abuse can the nailhead rods take?

Are there other weak links?
Thanks for your help! Chris
__________________
Kronz`nīDungle Hi Performance Exhausts
offline   Reply With Quote
Old 11-10-2013, 12:34 PM   #2
BOBCRMAN
Member
 
Join Date: Nov 2005
Location: Holly
Posts: 624
Default Re: Buick guys:401/425 Nailhead and Parts interchangeability questions

Rod length is the same. Block was raised for the longer stroke of the 425
offline   Reply With Quote
Old 11-10-2013, 01:16 PM   #3
Baumi
Alliance Member
 
Baumi's Avatar
 
Join Date: Jan 2003
Location: Landshut,Bavaria,Germany
Posts: 1,222
Default Re: Buick guys:401/425 Nailhead and Parts interchangeability questions

Thanks! So the 401-425 blocks are taller than the 364?
__________________
Kronz`nīDungle Hi Performance Exhausts
offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 11-12-2013, 01:11 PM   #4
CTFuzz
Old School HAMBer
 
CTFuzz's Avatar
 
Join Date: Jan 2002
Location: the smallest town in the smallest county in the smallest state
Posts: 2,506
Default Re: Buick guys:401/425 Nailhead and Parts interchangeability questions

401/425 have the same stroke, blocks are the same for your purposes. Yes, deck hight is more on the 401/425 than the 364. I wouldn't worry about the bottom end of a Nailhead as long as the boost isn't crazy high.
Good luck with the project.
__________________
http://jalopytimes.blogspot.com/
Pictures of Great New England Cars
offline   Reply With Quote
Old 11-14-2013, 04:01 AM   #5
Baumi
Alliance Member
 
Baumi's Avatar
 
Join Date: Jan 2003
Location: Landshut,Bavaria,Germany
Posts: 1,222
Default Re: Buick guys:401/425 Nailhead and Parts interchangeability questions

Thanks for the good info! All I have left to do is collecting parts, hahaha
__________________
Kronz`nīDungle Hi Performance Exhausts
offline   Reply With Quote
Old 11-14-2013, 08:09 AM   #6
models916
Grenade Inspector
 
Join Date: Apr 2012
Location: addison, IL
Posts: 136
Default Re: Buick guys:401/425 Nailhead and Parts interchangeability questions

you should be here

http://nailheadbuick.com/nailing-down
offline   Reply With Quote
Old 11-15-2013, 07:12 PM   #7
hidez57
Alliance Member
 
hidez57's Avatar
 
Join Date: Jan 2006
Location: yucca valley,ca
Posts: 162
Default Re: Buick guys:401/425 Nailhead and Parts interchangeability questions

Quote:
Originally Posted by models916 View Post
and here www.v8buick.com
offline   Reply With Quote
Old 12-14-2013, 10:43 PM   #8
4284555sd
Newbie
 
Join Date: Jun 2009
Location: LANCASTER KY 40444
Posts: 64
Default Re: Buick guys:401/425 Nailhead and Parts interchangeability questions

Buick Rods and crank are steel with small mains. Strong lower end. Worry more about pistons. Getting the right piston is getting hard. They move the pins up to lower the comp. Egg is bad about this. You'll have to have some made. Try not to use cast.
offline   Reply With Quote
Old 02-14-2014, 05:38 AM   #9
telriv
Newbie
 
Join Date: Aug 2005
Location: Conn.
Posts: 68
Default Re: Buick guys:401/425 Nailhead and Parts interchangeability questions

I've spent close to 2 yrs. coming up with a universal FORGED piston for the 401/425 engines. It has finally come to a reality. $795.00 includes pins, locks, pin fitting & 1/16th. or 5/64ths. standard ring combos. Taking deposits now. Once I have ALL your specs. will be 5-8wks. Each set is custom made for each particular set-up. Can read MUCH more about this on v8buick.com search Tom Telesco
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 On

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 05:49 AM.