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Author
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Topic: compression questions (289)
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Trailer_Trash
Gearhead Posts: 428
From: Alpharetta, Ga, US
Registered: Jan 2003
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posted 02-16-2003 01:35 PM
   
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?
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Bloose
Gearhead Posts: 275
From: Milwaukee, WI
Registered: Dec 2001
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posted 02-16-2003 06:52 PM
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
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Trailer_Trash
Gearhead Posts: 428
From: Alpharetta, Ga, US
Registered: Jan 2003
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posted 02-17-2003 03:23 PM
stock 65 heads, 4V. entiely stock engine.
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D&S Induction Systems
Gearhead Posts: 118
From: Columbia Heights Mn U.S.A.
Registered: Feb 2003
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posted 02-17-2003 11:11 PM
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.
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Trailer_Trash
Gearhead Posts: 428
From: Alpharetta, Ga, US
Registered: Jan 2003
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posted 02-18-2003 07:41 AM
EX. seats????
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Ryan Wilke
Gearhead Posts: 1501
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 02-18-2003 08:29 AM
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.........
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bluestreek
Gearhead Posts: 1289
From: Athens,GA
Registered: Jul 2001
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posted 02-18-2003 08:39 AM
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..
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