Brought to you in part by:

.

Shop Eastwood for your Auto Restoration Needs!


  Mustangsandmore Forums
  Ford Racing
  compression questions (289)

Post New Topic  Post A Reply
profile | register | preferences | faq | search

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
Author Topic:   compression questions (289)
Trailer_Trash
Gearhead

Posts: 428
From: Alpharetta, Ga, US
Registered: Jan 2003

posted 02-16-2003 01:35 PM     Click Here to See the Profile for Trailer_Trash   Click Here to Email Trailer_Trash     Edit/Delete Message   Reply w/Quote
i talked to an engine builder about obviously rebuilding my engine. i asked him if i was going to need valves and seats and stuff to run unleaded gas. he said that if you have more that 9.5 compression, you wont risk burning the valves with unleaded.

sooooooo... what is the compression on a stock 289?

IP: Logged

Bloose
Gearhead

Posts: 275
From: Milwaukee, WI
Registered: Dec 2001

posted 02-16-2003 06:52 PM     Click Here to See the Profile for Bloose   Click Here to Email Bloose     Edit/Delete Message   Reply w/Quote
What year? 2v or 4v? Stock heads? stock pistons?

I think it has been said before that reg seat are fine w/unleaded. I don't really know how comp ratio would affect it. I personally would either do hardend exaust seats or late model heads (I did E7 heads), but I'm no expert.

As far as comp of stock 289 it depends on the year and which 289 it is.

B-loose

IP: Logged

Trailer_Trash
Gearhead

Posts: 428
From: Alpharetta, Ga, US
Registered: Jan 2003

posted 02-17-2003 03:23 PM     Click Here to See the Profile for Trailer_Trash   Click Here to Email Trailer_Trash     Edit/Delete Message   Reply w/Quote
stock 65 heads, 4V. entiely stock engine.

IP: Logged

D&S Induction Systems
Gearhead

Posts: 118
From: Columbia Heights Mn U.S.A.
Registered: Feb 2003

posted 02-17-2003 11:11 PM     Click Here to See the Profile for D&S Induction Systems   Click Here to Email D&S Induction Systems     Edit/Delete Message   Reply w/Quote
Uhhhh....WHAT??? Did he give you a reason for his reasoning?

Get hard EX. seats!

On a head that old the Ex. seats are probibly burried any way.

IP: Logged

Trailer_Trash
Gearhead

Posts: 428
From: Alpharetta, Ga, US
Registered: Jan 2003

posted 02-18-2003 07:41 AM     Click Here to See the Profile for Trailer_Trash   Click Here to Email Trailer_Trash     Edit/Delete Message   Reply w/Quote
EX. seats????

IP: Logged

Ryan Wilke
Gearhead

Posts: 1501
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 02-18-2003 08:29 AM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Trailer_Trash:
EX. seats????

I suspect D&SIS was referring to exhaust valve seats....

Sure, your heads probably will require or at least benefit from a valve job; have the machine shop give you a quote to cut your heads, install hardened valve seats & grind them in. It still comes back to what you want to do, how much you have to spend, how quickly do you want to get it finished, etc. --- then YOU decide if you want to or can spring for the extra $$ to install & grind the hardened seats or not.........

IP: Logged

bluestreek
Gearhead

Posts: 1289
From: Athens,GA
Registered: Jul 2001

posted 02-18-2003 08:39 AM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
I've never had problems with the 289/302 stock valve seats, especially using undercut S/S valves. Spring seat pressures should be kept under 120lbs. Now those stock siamesed SB Chebby exhaust seats....... They seem to disentigrate at will.

------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..

IP: Logged

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2003, Steve LaRiviere. All Rights Reserved.


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Build a free Mustangsandmore.ws Home Page!]

[About M&M][Acronyms][Calendar][Chat][Classifieds] [Members' Pics] [M&M Mug Shots]

[ Mustangsandmore.com Bookstore] [Mustangsandmore.com T-Shirts][Tech Articles]