91 mustang factory bottom end what is piston cc

tyler97 · April 22nd, 2011, 04:44 PM

Im looking on a compression computer and need to know what the 91 forged piston ccs were and are they dished or dome flat or what have n0 clue

fogged306 · April 22nd, 2011, 05:45 PM

Flat tops and as far as I've found they're 7cc valve reliefs. With the stock chambers you end up with about 9.1:1

tyler97 · April 22nd, 2011, 07:13 PM

no im running 61cc trickflow what do you think that would be.

fogged306 · April 22nd, 2011, 07:21 PM

Depends on a few things. But probably around 9.3 I'm guessing. If the only difference you have from stock is the heads, then it won't bump compression much. Stock E7 chambers are 63cc I believe.

tyler97 · April 22nd, 2011, 07:34 PM

no the whole tfs 365hp kit

fogged306 · April 22nd, 2011, 07:39 PM

I meant as far as things that will change your compression ratio, like stroke, bore, and pistons. If you're stock stroke, stock pistons, regular gasket, with those heads then that's my guess. Tough to say because I don't know how far in or out your pistons are in relation to the deck and what gasket you're using, but even then those will only vary it maybe .1 to .2 points.

tyler97 · April 22nd, 2011, 07:58 PM

I should be able to run the cam it requires 9.1 comp thats why i asked

ryanw · April 22nd, 2011, 08:36 PM

stock e7 heads are 61.5 cc
Ford Head Flow Data and Specs

April 22nd, 2011, 04:44 PM	#1
tyler97 Regular 1991 gt cobra clone Join Date: Apr 2011 Location: FL Posts: 374 iTrader: 0 reviews	91 mustang factory bottom end what is piston cc Im looking on a compression computer and need to know what the 91 forged piston ccs were and are they dished or dome flat or what have n0 clue __________________ 1991 GT- Ripped torque boxes/no SFCs/306/24lb injectors/Twisted Wedge 170s/Full exhaust/Full bolt ons/X3Z computer Buid thread http://www.moddedmustangs.com/forums...ld-thread.html

April 22nd, 2011, 07:13 PM	#3
tyler97 Regular 1991 gt cobra clone Join Date: Apr 2011 Location: FL Posts: 374 iTrader: 0 reviews	no im running 61cc trickflow what do you think that would be. __________________ 1991 GT- Ripped torque boxes/no SFCs/306/24lb injectors/Twisted Wedge 170s/Full exhaust/Full bolt ons/X3Z computer Buid thread http://www.moddedmustangs.com/forums...ld-thread.html

April 22nd, 2011, 07:34 PM	#5
tyler97 Regular 1991 gt cobra clone Join Date: Apr 2011 Location: FL Posts: 374 iTrader: 0 reviews	no the whole tfs 365hp kit __________________ 1991 GT- Ripped torque boxes/no SFCs/306/24lb injectors/Twisted Wedge 170s/Full exhaust/Full bolt ons/X3Z computer Buid thread http://www.moddedmustangs.com/forums...ld-thread.html

April 22nd, 2011, 07:58 PM	#7
tyler97 Regular 1991 gt cobra clone Join Date: Apr 2011 Location: FL Posts: 374 iTrader: 0 reviews	I should be able to run the cam it requires 9.1 comp thats why i asked __________________ 1991 GT- Ripped torque boxes/no SFCs/306/24lb injectors/Twisted Wedge 170s/Full exhaust/Full bolt ons/X3Z computer Buid thread http://www.moddedmustangs.com/forums...ld-thread.html

April 22nd, 2011, 08:36 PM	#8
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,059 iTrader: 0 reviews	stock e7 heads are 61.5 cc Ford Head Flow Data and Specs __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

April 22nd, 2011, 05:45 PM	#2
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Flat tops and as far as I've found they're 7cc valve reliefs. With the stock chambers you end up with about 9.1:1

April 22nd, 2011, 07:21 PM	#4
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Depends on a few things. But probably around 9.3 I'm guessing. If the only difference you have from stock is the heads, then it won't bump compression much. Stock E7 chambers are 63cc I believe.

April 22nd, 2011, 07:39 PM	#6
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	I meant as far as things that will change your compression ratio, like stroke, bore, and pistons. If you're stock stroke, stock pistons, regular gasket, with those heads then that's my guess. Tough to say because I don't know how far in or out your pistons are in relation to the deck and what gasket you're using, but even then those will only vary it maybe .1 to .2 points.

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