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Author
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Topic: Header Bolt Size
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dubstar
Gearhead Posts: 399
From: Long Beach, Ca 1966 A-Code Coupe
Registered: Feb 2002
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posted 01-05-2003 03:06 PM
  
I have TRI-Ys on a 289 block, what size header bolts do i need? I noticed that im missing the first 4 on the right side (if your looking at it from the front->back) Im gonna try and pick these up today.. also, could i lose hp from having the headers not tight? i used to be able to burn out, but now i just stick... nothings changed. ------------------
horrAy for A(codes)!
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mustangs68
Moderator Posts: 16507
From: Hampton,Virginia,USA MCA#39406 M&M #12
Registered: May 99
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posted 01-05-2003 03:34 PM
same size as the first 4 on the left side 
sam
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69 Sportsroof
Gearhead Posts: 911
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 01-05-2003 06:34 PM
Just ask for header bolts at the parts store. They should know what you need. Oh, they usually come in a 6 or 12 pack because that's what chebbies use so you'll have to get extra packs if you're going to replace them all.
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SteveLaRiviere
Administrator Posts: 30261
From: Saco, Maine
Registered: May 99
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posted 01-05-2003 08:11 PM
3/8" x 1" coarse thread.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Remember our sponsors, Mustangs Plus, NPD, Osborn Reproductions, and MyFordPerformance.com.
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n2oMike
Gearhead Posts: 1316
From: Spencer, WV
Registered: Jan 2001
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posted 01-05-2003 08:36 PM
Yes, 3/8" coarse thread. But normal bolts won't usually work, their heads are too large. Special header bolts with 3/8" or 7/16" heads are what are generally needed.I believe Chevy bolts are only 5/16" and won't work on Fords. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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SteveLaRiviere
Administrator Posts: 30261
From: Saco, Maine
Registered: May 99
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posted 01-05-2003 08:39 PM
Right, he said he was getting header bolts.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Remember our sponsors, Mustangs Plus, NPD, Osborn Reproductions, and MyFordPerformance.com.
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67coupe
Gearhead Posts: 337
From: dallas NC usa
Registered: Nov 2000
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posted 01-05-2003 10:32 PM
chebbie crap is 3/8 too but like 69 said they come in odd numbers for the chebbie boys who cant count how many bolts should be in their motor  ------------------
Josh
67 coupe with 351c
8.41 in the 1/8
1.90 60'
at 82.03 mph
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5
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