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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  Will GT-40 heads fit an early 289

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Author Topic:   Will GT-40 heads fit an early 289
MidLifCrisis
Gearhead

Posts: 673
From: Frederick County, MD
Registered: Oct 2001

posted 01-27-2002 07:48 PM     Click Here to See the Profile for MidLifCrisis        Reply w/Quote
Can cast GT-40 heads be used on a '67 289-2V without worrying about notching the pistons? I would think any late model head would be an improvement over stock 34 year old heads. I just don't want to complicate my life, or have any hidden added expenses. Any and all help greatly appreciated. Thanks, Charlie

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 01-30-2002 11:33 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
If they are "stock" or replacment "stock" 289 pistons, they will bolt up fine. Your compression will be very low though.

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Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

MidLifCrisis
Gearhead

Posts: 673
From: Frederick County, MD
Registered: Oct 2001

posted 01-30-2002 08:11 PM     Click Here to See the Profile for MidLifCrisis        Reply w/Quote
I knew that the chambers were larger than a Hi-po head chamber, but I have a bone stock 289-2V and I'm not sure what size these have.

So do you think the loss in compression is significant enough to offset the improvement in breathing/flow? Charlie

69maverick
Moderator

Posts: 1539
From: Thomaston,CT.
Registered: Jan 2001

posted 02-07-2002 10:15 AM     Click Here to See the Profile for 69maverick        Reply w/Quote
Don't do it Chuck I know a kid that didn't listen to me and spent alot of money on a set of GT-40's and his car is a dog now!! He put them on a 69 302 and it has no power at all now!!Just a guess but I bet its about 8 to 1 comp.

MidLifCrisis
Gearhead

Posts: 673
From: Frederick County, MD
Registered: Oct 2001

posted 02-07-2002 06:29 PM     Click Here to See the Profile for MidLifCrisis        Reply w/Quote
69maverick, Thanks for the warning. I will wait until I can afford ARI or Edelbrock.

69maverick
Moderator

Posts: 1539
From: Thomaston,CT.
Registered: Jan 2001

posted 02-08-2002 08:27 AM     Click Here to See the Profile for 69maverick        Reply w/Quote
Chuck I'm putting a set of 69 modified 351w heads (51cc chambers and gt-40 valves with comp springs)on my 302 in the next few months if you wait that long I will let you know how it works out from the homework I have done it make a large difference?

69maverick
Moderator

Posts: 1539
From: Thomaston,CT.
Registered: Jan 2001

posted 02-08-2002 08:42 AM     Click Here to See the Profile for 69maverick        Reply w/Quote
Chuck do you already own the gt-40 heads and are they P heads? If so they will work good on a 5.0 motor. The 60cc head will raise the compession by 0.6 The 86 5.0 with flat tops are a problem ! I think the pistons need to be notched! Also there could be a problem with header clearance becouse of the relocated spark plug!

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Jim B. 70 Maverick Grabber clone 302,c4 auto
Weld drag lites,Holley 600,performer intake,comp cam,MSD ignition,2.5 " pipes Still needs paint!!

[This message has been edited by 69maverick (edited 02-08-2002).]

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 02-08-2002 09:16 AM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
quote:
Originally posted by 69maverick:
they will work good on a 5.0 motor.

quote:
Originally posted by MidLifCrisis:
I have a bone stock 289-2V


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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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69maverick
Moderator

Posts: 1539
From: Thomaston,CT.
Registered: Jan 2001

posted 02-09-2002 11:15 PM     Click Here to See the Profile for 69maverick        Reply w/Quote
Oh Ya ! Thanks buddy!! And there I thought I really was on to something!!!!!!

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