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  Mustangsandmore Forum Archive
  '79 to '93 -- The Fox Mustang
  GT40X heads on 84' 5.0

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Author Topic:   GT40X heads on 84' 5.0
axerob
Journeyman

Posts: 1
From: Lake Ariel, PA, USA
Registered: May 2006

posted 05-11-2006 10:52 PM     Click Here to See the Profile for axerob        Reply w/Quote
Hello, I just got my hands on a new set of Gt40X 303 heads from Ford. I want to install these on a 1984 5.0 H.O. For the time being, I will leave the stock flat tappet cam in the motor, eventually going with a performance grind (under .524 lift)...I will be using a Felpro head gasket set with a compressed thickness of .042".Will I need to be concerned with piston to valve clearance with either cam? I also plan on installing crane roller rockers (pedestal type, 1.6 ratio)...Will I need to change the length of the pushrods? I do understand that I will need stronger pushrods...but will the stock length for the 84 motor be ok? One last concern...Will my compression ratio drop much using these new heads? I am a new kid on the block, and do appreciate any help your collective experience can give me.

Jim B
Journeyman

Posts: 22
From: Chicago
Registered: Feb 2003

posted 05-17-2006 01:54 PM     Click Here to See the Profile for Jim B        Reply w/Quote
You should have no problems with the stock cam and the one you are thinking about as well. I put these heads on my 93 Cobra R which uses 1.7 RR with no problems. This is a great head with stock or mild cams. A friend also with a 93 Cobra with nearly the same exact engine mods as mine made 275 HP at the rear wheels.

Whick were GT40X heads, Ported Cobra intake, 70 MM Mass air, Equal length headders, and HP exhaust.

Tom G
Gearhead

Posts: 1069
From: Bethlehem, Pa USA
Registered: Nov 2001

posted 09-02-2006 02:32 PM     Click Here to See the Profile for Tom G        Reply w/Quote
No problem what so ever! Get some decent shorty headers to go along with the heads BBK equals "fit nice" pushrods will be the same ones you have now. Just sold a set of those used to a buddy of mine for his 74 Mustang II he has a 512 lift came and I sold him 1.7 rockers too. No clearance issues at all. You should pick up at least 50 hp on stock cam when you change cams probably another 50.

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67 Mustang F/B 302 GT-40X FMS engine RPM Air Gap 650 Holley DP Crane 1.7 roller rockers, Performer Nitrous, ceramic headers WC T5, cable clutch MagnaFlow SS kit W/X Pipe 3.89 9". SSBC 4 piston frdisc Clearwater Aqua, Vintage 40 series 16X8 215 front 255/50 drag radials 308 [email protected] 300 tq NA 385rwhp 380 w 75 shot 13.11 @111mph
88 GT (FiveOfastback's ride)347 Twisted wedge custom HYD roller 565 lift 182 duration Track Heat, BBK headers X pipe Gforce ? RWHP ? RWTQ Red and Silver New Project 69 Boss 302 Acapulco Blue

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