OK - so are there are any details on the "410" pistons.... I assume that these are basic cast pistons - not something forged. I am daydreaming about finding out that the truck moters had heavy rods, forged pistons and 8:1 compression as a cheap bolt-in replacement for my 352 under the 60MM turbo that is going on....On 2006-04-02 04:35, BillBallinger wrote:
No, the truck pistons are different between the car and truck 390. The truck 390 uses the 410 piston that lowers the compression to 8:1 and widens the quench the extra .100 the compression hieght differs. Outwardly the differences are as stated above. Keep in mind that trucks have usually had a hard life, and if they are in a junkyard, well...
The good news is that you can rebuild it with the right pistons and it will be a nice 9.5:1 motor. Pick out a better cam and get a good three angle valve job and it will be a very satisfying engine.
If you are looking for the best junkyard engine, get a '68-'70 390 2V regular fuel engine out of a Galaxie. They have the torque cam 256°/266° adv duration 192°/198°@.050 .427/.431 lift 113 LSA, dished pistons, and fast burn heads. If you recurve the distributorm put a set of headers on and a 4V manifold you'll like the idle-4500 rpm power it makes. It is much less likely to have had a hard life too.
<font size=-1>[ This Message was edited by: BillBallinger on 4/2/06 7:51pm ]</font>
It helps a lot. Thanks much...On 2006-04-05 05:46, BillBallinger wrote:
The 410 piston is just like the 3902V dished piston, but it was designed for the 3.98 stroke. It has the pin .100 higher, making the piston come up .100 lower in the bore on a 3.78 stroke engine. This was done on truck engines to lower compression, but it also killed efficiency by taking away squish/quench. It is a cast piston and is of the same strength as any other Ford piston.
Light truck engines really didn't get anything special, the 360 used the same skinny rods as the 352, and the 390 got the same rods as the car, however the are good rods for about anything within reason with good bolts. They are getting old though, so have them inspected.
Hope this helps.
If you aren't happy with it I'll buy it - PM me for my address.On 2006-04-05 11:26, jgnatek wrote:
I am in a similar position, I am supposed to go pick up a 390 out of a 1970 f250 this weekend for my 65' galaxie. It was rebuilt about 6k ago, has edelbrock heads, carb and intake, and electronic ignition... I am a bit concerned it will be a dog, but for $350 bucks I can't really complain.