another 351w build
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Mountain Pass
Joined: Mar 2014
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another 351w build
hey guys just pick up a 351w motor for $350 and now im trying to decide on what parts i need not brand but tech side. i know i am going with comp cams extreme 4x4 cams (part # 35-231-3) and trick flow pistons, heads, and lower inake. problem is that i don't know which trick flow head to get or piston and that kind of tech stuff can anybody give me some advice or where to go to ask question. and this truck is mainly a daily driver/ weekend offroad. its going to be pushing a truck that has a 6 inch lift + 3inch body lift with 35x14.5 tires with 3.73 gears.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Pistons are listed with the comp ratio matched to a listed combustion chamber volume. That's how. If you buy a 9 to 1 piston listed at that ratio for a 64 cc head, then substitute a head with a 58 cc chamber volume, then the ratio also changes, upwards and vice versa. There are several factors that change the comp ratio, among which are: piston head volume, head gasket thickness, and combustion chamber volume. To arrive at the comp ratio, you must first figure the swept volume, this is the area created by the piston travelling down the bore to bottom dead center. At top dead center, you have an area created above the piston, consisting of the chamber size itself, plus the area between the piston and the deck (top of the block) , the head gasket volume (varies by it's compressed thickness) and finally the area between the piston and the bore, down to the top ring. You addd all these values then add that to the swept volume, then divide that value by the compressed volume to get the ratio.
Elder User
Joined: Mar 2013
Posts: 847
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From: In my house..
sho nuff..
Trick Flow® Forged Pistons - trickflow.com
Trick Flow® Forged Pistons - trickflow.com
Elder User
Joined: Mar 2013
Posts: 847
Likes: 4
From: In my house..
hey guys just pick up a 351w motor for $350 and now im trying to decide on what parts i need not brand but tech side. i know i am going with comp cams extreme 4x4 cams (part # 35-231-3) and trick flow pistons, heads, and lower inake. problem is that i don't know which trick flow head to get or piston and that kind of tech stuff can anybody give me some advice or where to go to ask question. and this truck is mainly a daily driver/ weekend offroad. its going to be pushing a truck that has a 6 inch lift + 3inch body lift with 35x14.5 tires with 3.73 gears.
Trick Flow® Twisted Wedge® 170 Cylinder Heads for Small Block Ford: TFS-51410002-M61 - trickflow.com
and a set of these..
Trick Flow® Forged Pistons: TFS-51404221 - trickflow.com
assuming an +.030" overbore and stock rods..
I can think of better cams to use with that combo but it's your motor..
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Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
you want a pair of these..
Trick Flow® Twisted Wedge® 170 Cylinder Heads for Small Block Ford: TFS-51410002-M61 - trickflow.com
and a set of these..
Trick Flow® Forged Pistons: TFS-51404221 - trickflow.com
assuming an +.030" overbore and stock rods..
I can think of better cams to use with that combo but it's your motor..
Trick Flow® Twisted Wedge® 170 Cylinder Heads for Small Block Ford: TFS-51410002-M61 - trickflow.com
and a set of these..
Trick Flow® Forged Pistons: TFS-51404221 - trickflow.com
assuming an +.030" overbore and stock rods..
I can think of better cams to use with that combo but it's your motor..
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From: In my house..
Thread Starter
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Mountain Pass
Joined: Mar 2014
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i have to agree im still sitting on the motor (with 3 kids running around not enough time to work on it). so i don't want to go high octane on a daily driver thing sucks up enough fuel as it is on the interstate when i have to drive on it. but its mainly on city streets. so im thinking now just doing a rebuild with better cams, crank, and headers and call it that.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
What year is the motor. Unless the crank is trashed don't waste any money replacing it.. the bottom end of these motors is plenty strong. If you replace anything make it the heads, rebuild the bottom end to stock specs, add a decent RV cam, GT40 heads and headers and go drive it.
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Mountain Pass
Joined: Mar 2014
Posts: 147
Likes: 5
What year is the motor. Unless the crank is trashed don't waste any money replacing it.. the bottom end of these motors is plenty strong. If you replace anything make it the heads, rebuild the bottom end to stock specs, add a decent RV cam, GT40 heads and headers and go drive it.
thanks for the help conanski, but since i started this project my funds have been decreased to $1000 so i might just have to settle with just headers and maybe i could get a set of gt40 heads. but i was wondering what brand and type of RV cams do you recommend?
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