I have twin 525sc motors that I'm planning on rebuilding this winter. Would speed pro forged L2399F pistons work for this project? Reason being I have 2 new sets available to me if I can use them. I have new eq320 heads and going hyd roller. If not what piston should be used?

I rebuilt my 525sc with .060 over 2399 pistons. I used a 134561 flat crane cam, hp500 heads. Stock pulleys. I made 572hp@5600. Runs strong. Got 60 trouble free hours this summer.

the 525sc came with 7.5-1 compression ratio,the bump in compression from the L2399f piston will help wake it up,the eq 320s will also be a big improvement in power.with the right hyd roller cam you will have good reliable power.i think you will like the end result.

Thanks everyone.. What compression ratio should be used, 8.5, 8.8? I have stock pulley and the smaller pulley. Also running intercoolers.

i built a pair of 454s for a member,compression ratio of 9 to1,afr 305 heads,bob m cams and 177 blowers that made 690 on the dyno,ON 89 OCT FUEL.the cam,s were mild due to a wet exhaust.

The eq heads have 119cc chambers and speedpro's website shows 8.84 but does not say what thickness head gasket.
http://www.powerforgedpistons.com/pdf/applications.pdf

Mine made 572hp. How much of the 115hp would you attribute to the afr heads vs my 088?

If the heads are aluminum good for at least 9.5 compression. Make the setup conservative with rich fuel (under 12) and light timing in the 30-31 area.

BT

That piston has a 13.8cc dome. With the piston in the hole .010, a .053 head gasket, youll be about 8.9:1 with the .060 overbore.

I will be .030 over, so I think 8.8:1 with .010 in the hole and .053 head gasket. I have daytona sensors ignition boxes, can I still use the 525sc curve at that compression?