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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-20-2012, 10:43 PM   #1
Pearlkobra12
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Default Multiple engine questions

So i've been putting together a turbo build. So far i have the On3 Performance kit and the add on kit that had the injectors, maf...ect. I am using explorer gt40 heads and intake combo. I picked up a f-cam also. I am using the short block out of an 89 fox. Block is at the machine shop and it needs .030 over bore. So now here are my questions:
-I want to replace valve springs,retainers on the gt40's, what do you guys recommend (part numbers please)
-I was looking at these pistons kb116.03 KBS. Am i going to have any clearance issues with valves?
-What do you recommend for ring gap for 8-12 psi of boost

Sorry for the random questions but I've been searching for hours and feel like i've been chasing my tail. Thanks in advanced
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Old 03-20-2012, 10:53 PM   #2
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1.I got the trickflow springs for the gt40s back when I ran them. If I was serious, I would look into a beehive spring.

2. no idea what piston that is after a copy and paste on google.

3. ring gap should be included in the box with the pisotns
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Old 03-20-2012, 11:03 PM   #3
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http://www.jegs.com/i/Keith%20Black/...0002/-1?CT=999 is a jegs link to the pistons. Do you possibly know the part numbers for the Trickflows springs?
thanks
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Old 03-21-2012, 05:16 AM   #4
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Quote:
Originally Posted by Pearlkobra12 View Post
-I want to replace valve springs,retainers on the gt40's, what do you guys recommend (part numbers please)
the FMS spring set that is recommended to be used with the letter cams will cost you about $220! The retainers are shaped differently on the exhaust valve to make up for the differences in factory installed height.

If you are interested, You could sell off your current GT-40 heads and buy the set that I just had fully rebuilt. They already have the springs on them. They were professionally done by a local racing machine shop. PM me if you are even partially interested. I'll show you the receipts!
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Old 03-21-2012, 07:06 AM   #5
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How did you come to the conlusion that a dome piston and 10 pounds of boost is a good combo?

Here is the trickflow link. http://www.trickflow.com/partdetail....0&autoview=sku
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Old 03-21-2012, 07:38 AM   #6
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Quote:
Originally Posted by TrimDrip View Post
How did you come to the conlusion that a dome piston and 10 pounds of boost is a good combo?

Here is the trickflow link. http://www.trickflow.com/partdetail....0&autoview=sku
I guess I asked about these because there fairly inexpensive and i'm having issues finding .030 over pistons. Do you have any suggestions for pistons?
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Old 03-21-2012, 07:40 AM   #7
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Quote:
Originally Posted by AdderMk2 View Post
the FMS spring set that is recommended to be used with the letter cams will cost you about $220! The retainers are shaped differently on the exhaust valve to make up for the differences in factory installed height.

If you are interested, You could sell off your current GT-40 heads and buy the set that I just had fully rebuilt. They already have the springs on them. They were professionally done by a local racing machine shop. PM me if you are even partially interested. I'll show you the receipts!
Thanks for the info. How much are you looking for on these heads? I think I might be scared to see the cost to ship ha
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Old 03-22-2012, 01:48 AM   #8
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Those Kieth Black pistons are junk.
Get some forged pistons if you are planning any boost or 'severe' activity with the engine.
Yes, they cost money.....
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Old 03-22-2012, 01:48 AM
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