360 to 390 build up

dpriest · Post by **dpriest** » Tue Mar 16, 2010 2:05 pm

hello blue oval buddys, im considering changing my 360 into a 390 or possibly more. what would make this possible other than the 390 crankshaft

64squire · Post by **64squire** » Tue Mar 16, 2010 2:55 pm

.......and 390 connecting rods. That is the only difference between the two.

69rangerf100 · Post by **69rangerf100** » Tue Mar 16, 2010 7:18 pm

the crank is also different

Post by **70_F100** » Tue Mar 16, 2010 7:45 pm

69rangerf100 wrote:the crank is also different

That was already mentioned...

hazelnut · Post by **hazelnut** » Tue Mar 16, 2010 8:12 pm

You also need 390 pistons because 360 pistons have a different pin hight.

64squire · Post by **64squire** » Tue Mar 16, 2010 8:53 pm

hazelnut wrote:You also need 390 pistons because 360 pistons have a different pin hight.

360 pistons have the same pin height as 390 4V car pistons(1.76"). The 390 2V(1.66")truck pistons have a different height.
I'm using 360 pistons in my 390 build and will have a compression ratio around 9.6:1. It is pretty confusing, isn't it.

Dragon · Post by **Dragon** » Tue Mar 16, 2010 9:17 pm

Not really the .10 allowed the pistons to jump motors nicely and lower the compression for the trucks at the same time.

360 to 390 must haves are crank and rods, nice to have are pistons and cam. A Car cam from 67 or 68 will wake up a 390 but the 360 truck cam yawn.

dpriest · Post by **dpriest** » Wed Mar 17, 2010 7:50 am

today i found the donor crankshaft and new connecting rods. im debating the pistions. i dont plan on tearing back into the block but i dont want to spend it all at one place

. i have a mild cam and 4barrel intake. ive had headders for awhile but thinking of returning back to stock manifolds.i have been told to run 428 heads but dont plan on running over 6,000 rpm's

dpriest · Post by **dpriest** » Wed Mar 17, 2010 7:55 am

turns out the connecting rods were for a falcon. anyone know a way to tell if they will work such as factory part numbers? i dont want to buy the wrong parts or get screwd out of money

Dragon · Post by **Dragon** » Wed Mar 17, 2010 12:51 pm

It does not matter what car they came out of but what engine. Oh and if the Falcon you are referring to had a stock engine in it it was never a FE. They were born with the small six line and died with the 289/302/351W family.

dpriest · Post by **dpriest** » Thu Mar 18, 2010 7:57 am

thanks for the info

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360 to 390 build up

360 to 390 build up

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