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Author
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Topic: MoneyMaker or Quinn? Or someone who knows
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stinger
Gearhead Posts: 168
From: mn
Registered: Feb 2003
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posted 03-20-2003 11:07 AM
   
What are the specs on gt40 heads? I thought someone said the intake on all of these are 1.85? The ones I bought on ebay yesterday he says are 1.84. Are they the same thing. His picture says gt stamped on the head.
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JCQuinn@work
Gearhead Posts: 422
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 03-20-2003 11:30 AM
Intake valves are 1.84 exhaust 1.54 The GT-40 heads have the initials "GT" cast into them. The "GTP" heads have that cast into them.The GT-40 heads flow 40-50 cfm better than the E7TE heads that are used on 5.0 motors. and with a good port job they will flow about 90 cfm better. John
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stinger
Gearhead Posts: 168
From: mn
Registered: Feb 2003
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posted 03-20-2003 11:40 AM
so u are saying if I get the gt40 ported they will flow even better.
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JCQuinn@work
Gearhead Posts: 422
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 03-20-2003 03:23 PM
Heads always flow better with a good port job, thats why they do it. The cost of a port job in your case will exceed the cost of the heads and the heads will perform quite well without it. GT-40 heads ported will flow around 240 cfm and unported they flow about 195 cfm. This (195cfm) will give you plenty of performance for a hot street car. My advice is to run the heads unported and see how you like them. If you decide to port them it can always be done later. John
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stinger
Gearhead Posts: 168
From: mn
Registered: Feb 2003
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posted 03-20-2003 03:40 PM
Thank u Jc, I really appreciate your help.
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stinger
Gearhead Posts: 168
From: mn
Registered: Feb 2003
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posted 03-20-2003 04:13 PM
Is there any of the parts I can change on these heads too make them perform better? I found someone who will port them for me at a reasonable price, they owe me some cash so were going too call it even.
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JCQuinn@work
Gearhead Posts: 422
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 03-20-2003 06:00 PM
Make sure this person knows what they are doing. A bad port job will do more harm than good. These ports are not like any other small block port I have ever done. All the areas that most people work on to get better flow are already OK on these heads. I would do no more than raise the port roof slightly, smooth the other surfaces and install a good set of stainless valves with the stem undercut. That is pretty much what I am going to do with my heads. Without some flowbench work I wouldn't change anything else.The springs and retainers from any reputable cam company will work fine. Buy them from Alex, I am sure he will pick the right stuff and his prices are fine. You can't beat buying parts from somebody who races a class car. They have tried all the stuff and know what works. The big mailorder companys are telling you what somebody told them and it might be right or maybe not. John
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stinger
Gearhead Posts: 168
From: mn
Registered: Feb 2003
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posted 03-20-2003 06:40 PM
Hmm, I will probally skip the porting then, I dont want too screw them up. But u said its ok too change the valves,springs and retainers though. Would that make much of a diffrence or should I just leave them the way they are?
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 03-20-2003 06:44 PM
John's advice is wise. Good idea to follow it.
As for springs and retainers, that would depend on the cam you elect to use.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
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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