Original Message
The compression ratio.
By Dave Shoe - 09/16/2003 11:42:03 PM; IP 216.243.176.34
Actually, the 1971 Galaxie 390 was a pickup truck engine.

Prior to this, the car 390 was generally available in 9.5:1 and 10.5:1 compression ratios. The truck C.R was always roughly 8.5:1 to prevent pinging while towing heavy loads and it actually got Mercury 410 pistons installed to achieve this low compression ratio. You'll find the 390 truck pistons have a C8TE casting number inside them, but 410 text markings on the side.

Otherwise, the engines are similar, but with minor differences.

Note that 360 pickup engines got 390-4V car pistons. Some were cast with "390-4V" on the sides, and others had the "360" text on the sides. Both were the same.

Shoe.
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Collapse <a href=../ForumFE/reply.aspx?ID=18411&Reply=18411><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor18411" onclick="return false;">71 390 p/u</a>&nbsp;-- <font color=#0000ff>Jay, <i>09/16/2003</i></font><script type="text/javascript">
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 71 390 p/u -- Jay, 09/16/2003
The compression ratio. -- Dave Shoe, 09/16/2003
 the cam too -- Barry B, 09/17/2003
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