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Engine Elusive GT40X Turbo Swirl Aluminum Heads??

  • Thread starter Thread starter Gentry315
  • Start date Start date May 19, 2022
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    gt40 heads
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Gentry315

New Member
May 19, 2022
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WV
May 19, 2022
#1
  • May 19, 2022
  • #1
I have an '89 LX Convertible 5.0. Some people refer to it as an anniversary edition, however it's not...they just say that because of the "25 years" badge on the dash. It is however a very an uncommon set up (ordered from factory)... It's black with white rag top and white leather interior.

So...don't to business. I'm getting ready to rebuild this car with my youngest son. I'd like to get more HP from bolt-on's only and want to keep it "fairly" stock....not completely. After research, I've decided on GT40X heads, E303 Cam, 70mm throttle body and the other basics like distributor upgrade, new rings, new exhaust etc.

The dilemma! I cannot find GT40X heads anywhere! Have they been replaced? New model number? Does anyone know where I might find a set of these heads?

Thanks to all!!
 

90trunk

Active Member
Mar 5, 1999
60
50
28
Downriver DTW, Michigan
May 19, 2022
#2
  • May 19, 2022
  • #2
The M-6049-X305 and M-6049-X307 heads have been discontinued. The updated heads are M-6049-X2 . You can get pedestal AFR1472's at 58 cc vs. the 64 cc of the X2 head at their current pricing. Food for thought....

https://www.summitracing.com/parts/fms-m-6049-x2

https://www.summitracing.com/parts/afr-1472
 

Mstng93SSP

You have a nice rear end there Dave.
15 Year Member
Nov 29, 1999
2,993
3,500
184
Mililani, Hawaii
May 20, 2022
#3
  • May 20, 2022
  • #3
I have GT40X aluminum heads on one of my cars. I love them. I also had the above mentioned AFR heads on my coupe, before swapping to TFS heads with a turbo. I loved the AFR heads also. I always felt the AFR heads made better power and felt stronger. I would go with the AFR as my first choice, BUT I certainly think the GT40 heads are a good quality head as well.
 

2000xp8

SN Certified Technician
Aug 8, 2003
8,037
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NJ
May 20, 2022
#4
  • May 20, 2022
  • #4
Used at a good price, gt40x valve jobbed would be great.
Out of the box they really are mediocre at best. The factory machine work wasn't that great.
Optimally, buy a used set, then spend another $250 on them (maybe $350 if they need springs).
I had a set, i would use them again, but not at $1300 a set new.
 

LX1993

5 Year Member
Jan 4, 2018
89
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May 20, 2022
#5
  • May 20, 2022
  • #5
LMR has them in stock right now. Price went up again. $2000...
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,265
17,952
224
Massachusetts
May 20, 2022
#6
  • May 20, 2022
  • #6
At $2K, i would consider other options. Nothing against the GT40X heads, but I'd rather get the 11R's in that price range.
 

2000xp8

SN Certified Technician
Aug 8, 2003
8,037
1,625
194
NJ
May 21, 2022
#7
  • May 21, 2022
  • #7
The entire trick flow top end kit is $2900.
So Gt40x at $2000 would be a no...
I do like them, but IMO they are a great used $750 set of heads, not 2 grand.
 
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