1971 360 compression?

[rcodecj]

A friend of mine and I were talking about his dad's 71 pickup he bought new with  360 and he said he thought it was 9.3 compression.
I said I didn't think any 360 had compression in the 9's, not even the early ones.
No argument or anything just two guys who would like to know the compression of a 71 360.
Also I thought all 360's were all the same compression but I searched and can't find it.

[Drew Pojedinec]

360 Truck engine configurations and applications

    2V, 8.4:1
        215 bhp (160.3 kW) at 4100 rpm and 375 lb·ft (508 N·m) at 2600 rpm
            1968–1971 Trucks[32]
        196 horsepower (146 kW) net at 4000 rpm and 327 lb·ft (443 N·m) at 2400 rpm
            1972–1976 Trucks


thus spoke Wiki  (I thought it was a hair lower)

[rcodecj]

Thanks Drew.
So they all were 8.4.

[My427stang]

I honestly think even that 8.4 is optimistic.  I just took one down, untouched from 71, still had std 71 bearings and nylon timing gear.  It used 390 4V pistons with the short stroke and long rod at .110 below deck.  I had a hard time measuring the old head gasket, but it looked to be around .039.  That would put it closer to 7.8:1

Even with less head gasket and a 68 cc head, it barely breaks 8.1:1

They didn't compress much

[BigBlueIron]

Assembled one not long ago, it calculated out to 7.7:1 Amazing how well they can run considering a piston .130 in the hole...\

With no other changes I would like to try a set of the old 361 pistons, I think that would get around the 9 mark. Something for an old farm truck on the cheap.

[FElony]

Guys, what about using an L2292 dome piston?