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Engine GT 40 3 bar heads. ( worth the effort ? )

  • Thread starter Thread starter Rogie Stone
  • Start date Start date Jul 11, 2020

Rogie Stone

Active Member
Feb 21, 2016
41
59
28
Jul 11, 2020
#1
  • Jul 11, 2020
  • #1
I am in the process of building a 93 convertible, The goal for this car is for it to be a driver with about 350 HP.
I am almost done with suspension upgrades and provisions for 5 speed swap and it is time to start getting the engine ready to drop back in.
I need to decide on head cam intake combo.
Will I be able to meet my 350HP goal with GT 40 3 bar heads ?

Are the heads discribed in this for sale post worth the $ 400 ?
 

JD1964

there is enough sticking out to grab on to
15 Year Member
Jun 28, 2013
3,441
1,526
194
Maryland
Jul 12, 2020
#2
  • Jul 12, 2020
  • #2
These things are money pits. Many of us experience that first hand, including me. In this game remember this. Cheap is expensive.

With the power you’re looking for, I recommend a good set of aftermarket aluminum heads.

Those Gt40’s don’t mention any milling that’s been done. If they have been milled, then how much? Too much and you can’t get an intake to line up right unless it’s also milled accordingly. Also, too much milling makes the deck too thin and might cause problems with head gasket sealing.

I have Gt40 on my setup milled .015 and I’m about to change over to new aftermarket aluminum since I’ve had repeated head gasket problems. Trust me, these sbf are notorious for head gasket problems in performance applications.

Spend more money initially and you probably spend less in the long run. If you try and go cheap you might even get frustrated and wind up quitting altogether. We’ve seen that too
 
Reactions: Potomus Pete

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
17,944
224
Massachusetts
Jul 12, 2020
#3
  • Jul 12, 2020
  • #3
In my opinion, no. Not worth it.

I was originally planning a GT40 combo. After pricing out getting the heads worked over I decided to just spring for an aftermarket head.
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,932
10,574
203
polk county florida
Jul 12, 2020
#4
  • Jul 12, 2020
  • #4
I'll jump in here with my opinion.
I bought my 4 bar heads many years ago new, $600.
They are going on my engine now. If I needed to buy heads today I would skip right to a quality set of aluminum heads and never look back.
 

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
7,387
2,745
194
Kearney, NE
Jul 12, 2020
#5
  • Jul 12, 2020
  • #5
350 hp sounds too optimistic for Gt-40 heads, even with an intake and cam. There are aluminum ones that will get a lot closer.

I’d like to upgrade to a good set of iron performance heads for reliability reasons. But without knowing the heads’ history, I do not know how to tell if they are good by myself. I’d have to have a good machine shop check them out. How much do you like to gamble?
 
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