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I currently have a 94 gt with the P1SC Prochrager with only other mods being bbk shorty headers, full exhuast with the cats removed. I currently am running the 3.55" pulley making 11 pounds of boost. We are tearing the motor down in about a week. I purchased the Trick Flow 360HP top end kit for the upper part of the engine. I want to run a lower compression to make the motor safer for the boost. (3.2" pulley and anderson powerpipe in hand) THe problem is that with the SRS probe pistons, which are specifically reverse dome heads for twisted wedge, i'd be running 8.17-1 compression. With the FPS, which are dish top, id be running 8.49. The car will be a 306. What i'm wondering is since the car is primarily street, is 8.17 compression too low and will the FPS pistons even work with the twisted wedge heads? i was hoping to get the 8.5-1 compression, but just wasn't sure what HP the FPS would be rated to or if they'd even work with the heads. Any input/feedback/first had expierence with either of these pistons would be great! Ill also be running their h beams with the setup. Anything further need known about the setup to better answer, please let me know!

Thanks all! it's appreciated! links to the pistons are below.


P2305F - Ford 302/393W -12.2cc Dish Top FPS Pistons

14848 - Ford 302/393W -15.9cc Reverse Dome SRS Pistons
 

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As long as the cam isn't to radical, the FPS could work. They look just like stock 4 valve relief pistons, just with a larger dish. Since you are using the TFS 1 cam, I'd say you would be fine. Many of those Trick flow kits on stock short blocks without TW specific pistons. Regardless, the Piston to Valve clearance should be checked with any setup.
 
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