MustangWorks.com : Ford Forums - View Single Post - Choosing pistons to complement GT40P heads

Jeff Chambers · 10-20-2005, 07:08 AM

The best set that I had were some custom JE's that along with some creative milling of the heads netted me a nice 13.2:1 compression. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. Those heads were unported and had stock valve sizes! Seriously though if you're not planning on an all-out attack for HP, I'd consider a forged piston out of Probe's SRS line-up. Good quality, exacting tolerance for a modest price. Beyond that I'd call Wiseco for a two-relief stock replacement, un-dished.

10-20-2005, 07:08 AM	#2
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: Choosing pistons to complement GT40P heads The best set that I had were some custom JE's that along with some creative milling of the heads netted me a nice 13.2:1 compression. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. Those heads were unported and had stock valve sizes! Seriously though if you're not planning on an all-out attack for HP, I'd consider a forged piston out of Probe's SRS line-up. Good quality, exacting tolerance for a modest price. Beyond that I'd call Wiseco for a two-relief stock replacement, un-dished. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"