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Author
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Topic: GT-40 chamber size?
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powrshftr
Journeyman Posts: 75
From: Sarnia,Ontario,Canada
Registered: Apr 2003
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posted 02-15-2004 02:08 PM
   
Hey guys,
I bought a set of the early cast iron GT-40 heads recently,and I'm having trouble finding specs on the chamber size.I need the #'s so I can buy pistons to properly set my compression ratio for the 306ci motor I'm building for my '66 coupe.Does anybody have these specs,or know them off the top of your head?
Thanks guys,
Scott
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Moneymaker
Administrator Posts: 21725
From: Lyons, IL, USA
Registered: May 99
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posted 02-15-2004 02:31 PM
Early casting were availabe in 58 or 62 cc configurations. Late ones are all 62cc.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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powrshftr
Journeyman Posts: 75
From: Sarnia,Ontario,Canada
Registered: Apr 2003
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posted 02-15-2004 02:38 PM
Thanks Alex!
Hope these are the 62cc versions,I can use all the chamber size I can get to help get my compression down around the 8.2/8.4 level I'm looking for to run with the turbo.
Scott------------------
Turbo'd '66 Mustang coupe
-306ci Comp hyd.roller cam,Victor jr.,GT-40 hds,
BIGS 740cfm blowthru carb
-Toploader 4-speed
-3.50 Detroit Locker
-Torq-Thrust 'D''s & BFG
Drag Radials
-Raven Black
-Chassis dyno & drag strip #'s to come this spring!
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Stephen & Horace Johnson
Gearhead Posts: 103
From: Gadsden, AL
Registered: Jul 2002
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posted 02-16-2004 12:24 AM
You might ought to check the CC or have a machine shop check them, I ran a couple of sets of the GT-40s and I checked the CC and they were 65.5. Some Gt-40s were 62ccs but some were also 65.5------------------
Stephen Johnson #2162
Horace Johnson #2167
NHRA-IHRA SS/D 427 Ford Fairlane (Ex-Van Cleve)
9.50@ 139mph
1985 Mustang FFW True Street 11.86 @115mph (N/A)
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Billy Mac
Gearhead Posts: 450
From: S.Ga
Registered: Aug 2003
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posted 02-16-2004 12:44 AM
Just outta curiosity Johnson & Johnson,.....what kinda 1/8 mile times is that Fairlane postin???
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Strain Gang
Gearhead Posts: 118
From: Thor, Iowa
Registered: Mar 2003
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posted 02-16-2004 08:01 AM
The set of GT-40 irons we just got rid of cc'd at 67.5, so you might want to check them to make sure. They were advertised as 65.5, but ours were not. Steve.
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Stephen & Horace Johnson
Gearhead Posts: 103
From: Gadsden, AL
Registered: Jul 2002
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posted 02-18-2004 12:30 AM
6.00s in the 1/8------------------
Stephen Johnson #2162
Horace Johnson #2167
NHRA-IHRA SS/D 427 Ford Fairlane (Ex-Van Cleve)
9.50@ 139mph
1985 Mustang FFW True Street 11.86 @115mph (N/A)
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Billy Mac
Gearhead Posts: 450
From: S.Ga
Registered: Aug 2003
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posted 02-18-2004 12:48 AM
Not wanting to be too nosy...(well...ok...yeah I am)........How much does that thing weigh???
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Stephen & Horace Johnson
Gearhead Posts: 103
From: Gadsden, AL
Registered: Jul 2002
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posted 02-20-2004 01:06 AM
Alot------------------
Stephen Johnson #2162
Horace Johnson #2167
NHRA-IHRA SS/D 427 Ford Fairlane (Ex-Van Cleve)
9.50@ 139mph
1985 Mustang FFW True Street 11.86 @115mph (N/A)
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Billy Mac
Gearhead Posts: 450
From: S.Ga
Registered: Aug 2003
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posted 02-20-2004 08:10 AM
"A Lot"....HuH?.....(lol)....are ya runnin' for office??....sounds like a politician's answer.....I was just tryin to mentally compare your combo to mine..(e.t. wise)....but then again ....a SS motor (with EVERYTHING MUCH massaged)is a far cry from a "bracket" stroker....and as for weight.....it would prolly take TWO of mine to equal yours...(not a fair comparison...)Shame of it is....You'd prolly kick my arse  
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Stephen & Horace Johnson
Gearhead Posts: 103
From: Gadsden, AL
Registered: Jul 2002
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posted 02-21-2004 12:58 PM
lol...I was just messing with ya, our weight for the class is 3395 but we always tip the scales at 3410. Hope that helps------------------
Stephen Johnson #2162
Horace Johnson #2167
NHRA-IHRA SS/D 427 Ford Fairlane (Ex-Van Cleve)
9.50@ 139mph
1985 Mustang FFW True Street 11.86 @115mph (N/A)
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Billy Mac
Gearhead Posts: 450
From: S.Ga
Registered: Aug 2003
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posted 02-22-2004 09:45 AM
3410!!!!....6.oh's.....dammitboy!!!!.....(wahhhhh....whine....sniff, sniff.)...makes my 2600 (with me in it)pounder feel purty weak only runnin' 6.40's.......BUT....when you factor in the following....it ain't THAT bad either.....(stock bottom end...crank 10/10....rods....0.60 over flat top pistons....Dove-C heads....2.19/1.76 valves....exhaust "hump" removed....no other porting.....603/.609 solid cam....1050 Dominator...[severly "wounded"...was leaning out BAD on the top end...even with 99 jets in it].sitting on top of an Offy Port-O-Sonic, with adapter for the Dominator.....Glide...5500 converter....4.86 rear gears ...33x16x15 Mickeys........4-link...coil overs...)[This message has been edited by Billy Mac (edited 02-22-2004).]
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