C6 high RPM's
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C6 high RPM's
Hey guys, just joined the site. This week I purchased a 74 F100 for a restore project. Was told it had a 390 but, after discovering the Y in VIN, I found it's actually a 360 with a 2 bbl. it also has C6 tranny and after taking it out for a ride I noticed the RPM's seem really high at 55 mph. I don't have a tach in it yet so don't know the exact revs. Just sounded really high. Is this normal for a C6?
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Joined: Nov 2011
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On the engine... most likely it is a 360 as built. Still, if the engine was ever swapped, it could be a 390. I believe you can check stroke through the spark plug hole to verify... there are many posts on this topic.
Since you can decode the vin you can figure out which rear axle ratio the truck was built with. This will help figure out cruise RPM if it has the original rear end.
Since you can decode the vin you can figure out which rear axle ratio the truck was built with. This will help figure out cruise RPM if it has the original rear end.
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Joined: Feb 2004
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From: The Shenandoah Valley
Hey guys, just joined the site. This week I purchased a 74 F100 ... etc ... it also has C6 tranny and after taking it out for a ride I noticed the RPM's seem really high at 55 mph. I don't have a tach in it yet so don't know the exact revs. Just sounded really high. Is this normal for a C6?
Yeah, to anyone raised with 4s and 6s and ODs ..... it's gonna sound like it's racing at 70.
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