318 pistons

Hi!

I'm rebuilding my 318 down here in Brazil, on a budget.

Our 318's are a bit diferent from yours, for exemple, the stock compression ratio was around 7,5:1 (pistons were as low as 0.149" from the deck).
Our gas today has around 15% to 22% ethanol, so a lot more tolerant to compression than it used to be.

I was considering the Sealed Power 285Ap pistons, using the compression calculator ate the summit page, it gave me a 8.28:1 compression ratio, using the deck measured by a friend with those exact same pistons (0.064"), combustion chambers with 64cc, compressed head gasket with 0.039" tickness, and bored to 3.940.

But I found a different set of pistons, also from sealed power, the 526AP.
They seem almost the same, but the compression hight is 1.745" against 1.720" from the 285AP, and they are flat heads with no valve reliefs.

Has anybody used them?
By the description at the site, thats the only differences between them.

I'm running Summits k-6901 camshaft (218/228 @ 0.050, .441 lift), with stock 1.75"/1.50" valves.

Thanks!

(ow, I know KB-167s would be the best, but with our taxes, they get here for US$ 793.00, while the 526 would get here around US$ 352)