RED line

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Nov 11, 2004 | 12:19 AM

1986 F-150

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From: Indiana Indy.

RED line

I'm getting ready to put on an after market tach. but I don't know the red line for my "new to me" 1986 300 I6 Can somebody give me the numbers?

Nov 11, 2004 | 11:51 AM

Sam_Fear

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From: Davenport, IA

From what I've picked up here, you don't ever want to rev a 300I6 past 4000. I don't think I've ever gone higher than 3600. My 87 F150's stock tach redlines at 5700 - I can't imagine reving it that high! Thing would sound like a jet taking off! I bet it would handle it though - if you haven't heard, 300I6's are overbuilt and nearly indestructable.

Nov 11, 2004 | 04:59 PM

SawZall

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From: Fayetteville,AR

I have a 79 300I6 and the book says that redline is at 3200RPM. That seemed to be about right. I have turned 6000rpm but it was on a dare.

Nov 11, 2004 | 08:58 PM

19903024x4

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From: Independence, MO

why would redline be at 3200?....i have a 95...would the redline be any higher for that year?

Nov 11, 2004 | 09:04 PM

82F100SWB

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From: Dryden, ON, Canada

With the stock cam, all is said and done at 3600, anything beyond that and it's just making noise.
Personally, my 300 saw 7000 rpm a few times, but, it was very far from stock....

Nov 12, 2004 | 04:33 PM

19903024x4

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From: Independence, MO

ok lets say stock goes above 3200......i wouldn't think that would blow it up....i don't have a tach in mine....but i also don't rev it up or race in it

Nov 12, 2004 | 08:42 PM

Guitar_Stitch

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I've revved mine up to 4500 with over 200K miles on it, no problems.

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Nov 19, 2004 | 07:44 PM

300six1990

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Joined: Aug 2004

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From: Port Jervis, NY

My owner's manual says 4000.... It sounds about right because it just about signs off around 3500 anyways... Mine has seen about 5000 when I blew out a u-joint but it still runs fine as far as I can tell.... It has about 216,000 miles and has a bit of a knock anyways...