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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 01-30-2014, 10:22 PM   #1
9165pt0
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Default explorer gt40 heads with HO cam?

I have read that the explorer gt40/gt40p heads had weak valvesprings. Some say they are the same at e7 valvesprings. Im not sure which is correct. Im sticking with the stock ho cam, wondering if the gt40 explorer valvesprings will hold up to 5200rpm?

Any experiences with ppl who have used the explorer valvetrain and ho cam is appreciated. Thanks
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Old 01-30-2014, 11:29 PM   #2
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Those parts will work fine together. no worries.
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Old 01-31-2014, 09:59 AM   #3
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ok thanks. any idea of how much spring pressure is needed? Im having a machine shop check out the springs for me.
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Old 01-31-2014, 02:09 PM   #4
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closed 75. Open 215.
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ENGINE363 fully forged dart engine on the way with more spray!TRANNY C4 with trans brake, 3800 stall, 9in. raceconverter, hurst shifter REAR Moser 35 spline kit with spool, FRPP 3.73 gearsSUSPENION UPR pro street Uppers & lower control arms, Strange 10 way dampers, coilovers up front, BBK sub frame connectors, UPR Tube K-member & A-arms10.57@123.9 (OLD 5.0)
2011 CamaroSS 12.34@110.92









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Old 01-31-2014, 03:15 PM   #5
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ok sounds good. my buddy thought 90lbs and 260lbs for 5000rpm. idk where he got those specs. but ill be sure to check the specs of these to what you stated. thanks again
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Old 01-31-2014, 04:55 PM   #6
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IIRC the gt40P heads have a higher spec spring on them than the gt40 heads.
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Old 02-03-2014, 10:30 PM   #7
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the machine shop told me my seat pressure was 80lbs. is this enough for the stock ho cam?
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Old 02-03-2014, 10:30 PM
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