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Author Topic:   MoneyMaker or Quinn? Or someone who knows
stinger
Gearhead

Posts: 168
From: mn
Registered: Feb 2003

posted 03-20-2003 11:07 AM     Click Here to See the Profile for stinger   Click Here to Email stinger     Edit/Delete Message   Reply w/Quote
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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Gearhead

Posts: 422
From: Lakewood, CO, USA
Registered: Jun 2001

posted 03-20-2003 11:30 AM     Click Here to See the Profile for JCQuinn@work   Click Here to Email JCQuinn@work     Edit/Delete Message   Reply w/Quote
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

posted 03-20-2003 11:40 AM     Click Here to See the Profile for stinger   Click Here to Email stinger     Edit/Delete Message   Reply w/Quote
so u are saying if I get the gt40 ported they will flow even better.

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Gearhead

Posts: 422
From: Lakewood, CO, USA
Registered: Jun 2001

posted 03-20-2003 03:23 PM     Click Here to See the Profile for JCQuinn@work   Click Here to Email JCQuinn@work     Edit/Delete Message   Reply w/Quote
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

posted 03-20-2003 03:40 PM     Click Here to See the Profile for stinger   Click Here to Email stinger     Edit/Delete Message   Reply w/Quote
Thank u Jc, I really appreciate your help.

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stinger
Gearhead

Posts: 168
From: mn
Registered: Feb 2003

posted 03-20-2003 04:13 PM     Click Here to See the Profile for stinger   Click Here to Email stinger     Edit/Delete Message   Reply w/Quote
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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Gearhead

Posts: 422
From: Lakewood, CO, USA
Registered: Jun 2001

posted 03-20-2003 06:00 PM     Click Here to See the Profile for JCQuinn@work   Click Here to Email JCQuinn@work     Edit/Delete Message   Reply w/Quote
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

posted 03-20-2003 06:40 PM     Click Here to See the Profile for stinger   Click Here to Email stinger     Edit/Delete Message   Reply w/Quote
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

posted 03-20-2003 06:44 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
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.

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Alex Denysenko
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