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Author Topic: GT40/GT40p valve sizes......  (Read 2089 times)
302ute
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« on: April 11, 2011, 02:48:11 AM »

I have a set of GT40p heads and a set of GT40 heads. It looks as if the p heads have a smaller exh valve. I have two sets of 6000 series ferrea valves which measure 1.94 in and 1.55 exh. Is there enough material in both of these heads to take advantage of the larger intake?  And also is it beneficial to put 1.55 exh valves in the p heads?

The heads owe me nothing and the valves are brand new and were VERY cheap.

Thanks in advance.
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Bad95gts
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« Reply #1 on: April 11, 2011, 04:41:46 AM »

Yes they will go in. The 1.94 intake is probably more than it needs but I would use them.
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jayh
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« Reply #2 on: April 11, 2011, 05:42:02 AM »

1.94 will definately go in. Ive seen a 2.02 in dooe 351 head which is what that intake port is based off
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65mustang393
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« Reply #3 on: April 11, 2011, 05:52:46 AM »

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« Last Edit: January 16, 2012, 01:09:24 PM by 65mustang393 » Logged
rmcomprandy
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« Reply #4 on: April 11, 2011, 07:29:46 AM »

Your valves will work fine.
Also,  I have used a 2.02" intake valve, (bowl ported of course), with a production size exhaust valve, (or a 1.500" diameter), and the clearance around the spark plug is the point to look out for.
 The big intake / small exhaust works well especially when an exhaust system needs to be used and it is cammed correctly for this.
« Last Edit: April 11, 2011, 07:35:36 AM by rmcomprandy » Logged
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65mustang393
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« Reply #5 on: April 11, 2011, 08:34:29 AM »

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« Last Edit: January 16, 2012, 01:09:04 PM by 65mustang393 » Logged
65mustang393
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« Reply #6 on: April 11, 2011, 08:44:03 AM »

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« Last Edit: January 16, 2012, 01:08:30 PM by 65mustang393 » Logged
302ute
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« Reply #7 on: April 11, 2011, 02:48:59 PM »

Thanks for the replies. Is there any real benefit in running the larger intake valve even if I have already done the throats on the gt40p heads as far as I am game? In other words, same throat size just a larger valve.
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jayh
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« Reply #8 on: April 11, 2011, 02:59:44 PM »

the dooe's I seen were 2.02/1.50

the word on the street/general consensis is to run as much intake valve as physically possible. makes sense to me.
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