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Old 08-08-2011, 11:33 AM
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waterslinger waterslinger is offline
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Default 460 EFI piston

good piston for a 95 EFI F-350 towing app

Plan is to clean up the heads (bowl port and egr bump), comp 252H cam, headers and DE-smoged.


Federal Mogul/Speed Pro Piston Part
Number

Application Power Range Special requirements Compression information
Ring groove size

Pin diamater
Rod length

Stroke
Deck clearance

Skirt clearance



H535CP and a FREE set of Perfect Circle Cast Rings (50843CP)




Ford 460 4.420" bore 1972-90 hypereutectic flat top

2 valve reliefs


idle to 6500+rpm Good for mild street/strip 1.752 compression distance

Approx. Compression (@.030"):

w/72cc heads 10.81:1

w/73.5cc heads 10.66:1

w/77.0cc heads 10.33:1

w/92cc heads 9.14:1

5/64" 5/64" 3/16" ring grooves

1.0402" pin diam. - pins included
for stock length rods

press only

Stock stroke
.040" deck clr

.0015" skirt clr
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Old 08-08-2011, 12:21 PM
rmcomprandy rmcomprandy is offline
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Quote:
Originally Posted by waterslinger View Post
good piston for a 95 EFI F-350 towing app

Plan is to clean up the heads (bowl port and egr bump), comp 252H cam, headers and DE-smoged.


Federal Mogul/Speed Pro Piston Part
Number

Application Power Range Special requirements Compression information
Ring groove size

Pin diamater
Rod length

Stroke
Deck clearance

Skirt clearance



H535CP and a FREE set of Perfect Circle Cast Rings (50843CP)




Ford 460 4.420" bore 1972-90 hypereutectic flat top

2 valve reliefs


idle to 6500+rpm Good for mild street/strip 1.752 compression distance

Approx. Compression (@.030"):

w/72cc heads 10.81:1

w/73.5cc heads 10.66:1

w/77.0cc heads 10.33:1

w/92cc heads 9.14:1

5/64" 5/64" 3/16" ring grooves

1.0402" pin diam. - pins included
for stock length rods

press only

Stock stroke
.040" deck clr

.0015" skirt clr
SO ... what is the question?
The compression ratio you list is with the piston some .040" down the hole.
Unless you have a 90 cc combustion chamber head or larger, the compression would be a little high for a regular gas, towing application.
EDIT: Customers just don't have premium gas engines built to use for towing.
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Last edited by rmcomprandy; 08-08-2011 at 12:36 PM. Reason: addition
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Old 08-08-2011, 12:30 PM
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Good piston for a truck doing some 5k boat towing or is comp to high?
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605ci Big Block, 2 Speed J.W. Trans. w/4800 stall, 9" rearend 3.89 gear, 4-Link suspension,

1/8 mile 5.84 @124.5mph

http://www.geocities.com/ryan98gt/fordzilla.html
http://www.geocities.com/waterslinger1
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Old 08-08-2011, 12:44 PM
rmcomprandy rmcomprandy is offline
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Quote:
Originally Posted by waterslinger View Post
Good piston for a truck doing some 5k boat towing or is comp to high?
Depends upon the cylinder head being used. Decking the block to ZERO will raise it another half point.
I would use the replacement 88 - 93 F.I. pistons #H582P and zero deck the block or to have no more than .015" down the hole with a 92 cc F.I. head having 2.11" intake valve.
The cam would depend upon whether or not you are prepared to modify the ECM with a Tweeker or not.

An ACTUAL vehicle meant for towing should not be required to use Premium gas.

EDIT: The 535 DOES have the larger intake notches though if a large intake valve is being used.
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Last edited by rmcomprandy; 08-08-2011 at 05:45 PM.
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Old 08-08-2011, 12:59 PM
rmcomprandy rmcomprandy is offline
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I just read it all again, the intake valve diameter in the later F.I. heads you have are large enough: the earlier F.I. heads have smaller intake valves. Personally I would use a 37.5 degree I.H.C. seat on those intake valves and bowl port the heads.
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Old 08-08-2011, 01:02 PM
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F3TZ heads, The 252H is a wimp cam, thinking it will keep the SD efi happy.
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605ci Big Block, 2 Speed J.W. Trans. w/4800 stall, 9" rearend 3.89 gear, 4-Link suspension,

1/8 mile 5.84 @124.5mph

http://www.geocities.com/ryan98gt/fordzilla.html
http://www.geocities.com/waterslinger1
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Old 08-08-2011, 05:29 PM
rmcomprandy rmcomprandy is offline
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Quote:
Originally Posted by waterslinger View Post
F3TZ heads, The 252H is a wimp cam, thinking it will keep the SD efi happy.
It won't ... been there; it can be made to work after some fuel pressure tuning..Low RPM cylinder pressure won't be a computer match for higher RPM cylinder pressures.

#XE256H-14 CompCams or #06169 Lunati are the cams which go right in.
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Last edited by rmcomprandy; 08-08-2011 at 05:37 PM.
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Old 08-08-2011, 05:37 PM
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My vote is for the KB 3109 88-92 cast piston. (If you want the hypereutectic, get the KB3109H or the KB3109HC [<---"C" = coated skirt]). Keith Black puts the pin at 1.76" which is 0.008" higher than the Speed-Pro.

I agree that for towing more than 9:1 can be pushing it in some situations. I'm rebuilding my F250 engine for towing the triple-axle race trailer and have set compression ratio at 8.8:1 and put fire slots in the cylinder head's quench pads. By the way, the KB 3157 (93-97, ~18cc's) has a 1.77" pin height (even less decking required) and that ought to get you around 8.8:1 with a 0.005" deck.

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Old 08-09-2011, 06:38 AM
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Thanks for the hot tips guys, its the small things that make or break a combo, race or tow.

You guys ever mess with the BBk TB?
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605ci Big Block, 2 Speed J.W. Trans. w/4800 stall, 9" rearend 3.89 gear, 4-Link suspension,

1/8 mile 5.84 @124.5mph

http://www.geocities.com/ryan98gt/fordzilla.html
http://www.geocities.com/waterslinger1
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  #10  
Old 08-09-2011, 08:45 AM
stonecoldtx stonecoldtx is offline
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Quote:
Originally Posted by Paul Kane View Post
My vote is for the KB 3109 88-92 cast piston. (If you want the hypereutectic, get the KB3109H or the KB3109HC [<---"C" = coated skirt]). Keith Black puts the pin at 1.76" which is 0.008" higher than the Speed-Pro.

I agree that for towing more than 9:1 can be pushing it in some situations. I'm rebuilding my F250 engine for towing the triple-axle race trailer and have set compression ratio at 8.8:1 and put fire slots in the cylinder head's quench pads. By the way, the KB 3157 (93-97, ~18cc's) has a 1.77" pin height (even less decking required) and that ought to get you around 8.8:1 with a 0.005" deck.

Paul
There is also the Speed Pro H612CP, which has a compression height of 1.772", another .012" higher than either of the KB's, which puts the piston closer to the deck surface.

This is a Hypereutectic piston, stock replacement for the 93-97 EFI 460's, and it has coated skirts as well.

Here is the link to the Summit page for this piston (the + 0.040" size):

http://www.summitracing.com/parts/SLP-H612CP40/

Generally, the KB pistons are among the lowest priced pistons on the market, and they're good quality parts; in most cases, it would be more cost effective to go with those, but I have a brand new set of 8 of these exact pistons (same piston, same size) that I took out of a freshly rebuilt longblock that was never run, with brand new rings, pressed onto freshly reconditioned truck rods; PM me in case you're interested, waterslinger . . .
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Old 08-09-2011, 11:36 AM
rmcomprandy rmcomprandy is offline
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Quote:
Originally Posted by stonecoldtx View Post
There is also the Speed Pro H612CP, which has a compression height of 1.772", another .012" higher than either of the KB's, which puts the piston closer to the deck surface.

This is a Hypereutectic piston, stock replacement for the 93-97 EFI 460's, and it has coated skirts as well.

Here is the link to the Summit page for this piston (the + 0.040" size):

http://www.summitracing.com/parts/SLP-H612CP40/

Generally, the KB pistons are among the lowest priced pistons on the market, and they're good quality parts; in most cases, it would be more cost effective to go with those, but I have a brand new set of 8 of these exact pistons (same piston, same size) that I took out of a freshly rebuilt longblock that was never run, with brand new rings, pressed onto freshly reconditioned truck rods; PM me in case you're interested, waterslinger . . .
That H612P is the piston which FRPP enlarges the intake notch and uses in all their cast piston crate motors.
It however, has a .189" deep bathtub dish and uses metric rings.
The H582P has a .065" deep bathtub dish using fractional rings.

Both have a production offset wrist pin and can be had with a coated skirt from Federal Mogul with a suffix of CP rather than simply P.

They also still sell the 70's version of this piston with a .240" deep bathtub dish. H418P or CP which has an offset pin, a 1.752" CD and uses fractional rings.

EDIT: ALL the pistons above are Hypereutectic.
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CUSTOM ground camshafts
Carburetor modifications for specific applications
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Last edited by rmcomprandy; 08-09-2011 at 11:41 AM. Reason: addition
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