95 460 EFI rebuild options
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Cargo Master
Joined: Feb 2008
Posts: 2,862
Likes: 44
From: Tooele, UT
95 460 EFI rebuild options
Ok guys so I've decided to do a rebuild on my 95 EFI 460 and was wondering about my options for piston type and cam. If I go with flat top pistons and an rv cam what am I going to have to do to my EFI if anything to make them work? Will I even be able to go with flat top pistons? What are some good kits to look at that won't break the bank and which cam can I use? Just figure if I'm gonna be doing it I may as well get a little bit of a performance upgrade. I've already got headers and will be putting on a 3" exhaust.
Let me hear you recommendations and experiences! All are welcomed.
Let me hear you recommendations and experiences! All are welcomed.
Laughing Gas
Joined: Mar 2011
Posts: 811
Likes: 1
From: West Central Southern MN
Originally Posted by mxer0022
Ok guys so I've decided to do a rebuild on my 95 EFI 460 and was wondering about my options for piston type and cam. If I go with flat top pistons and an rv cam what am I going to have to do to my EFI if anything to make them work? Will I even be able to go with flat top pistons? What are some good kits to look at that won't break the bank and which cam can I use? Just figure if I'm gonna be doing it I may as well get a little bit of a performance upgrade. I've already got headers and will be putting on a 3" exhaust.
Let me hear you recommendations and experiences! All are welcomed.
Let me hear you recommendations and experiences! All are welcomed.
Thread Starter
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Cargo Master
Joined: Feb 2008
Posts: 2,862
Likes: 44
From: Tooele, UT
I was told on the 429-460 forums to use speedpro H535P flat top pistons and mill the block .025" for better quench then buy a custom ground cam specifically for speed density EFI. Also to port the intake.
Does this sound like it'll work well?
Does this sound like it'll work well?
Laughing Gas
Joined: Mar 2011
Posts: 811
Likes: 1
From: West Central Southern MN
It could work. That is a lot to take off the block, and your compression may be too high to run regular unleaded gas at that point. The main thing for a speed density friendly cam is that it needs to maintain a high enough vac level at idle. The PCM will compensate for the resulting changes from a mild cam upgrade, but that's it. I would look at the EFI friendly cams from lunati and comp.
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Cargo Master
Joined: Feb 2008
Posts: 2,862
Likes: 44
From: Tooele, UT
So here are the specs that comp recommends. This isn't too much for my speed density set up is it?
Inline image 2Inline image 3
Description
Part Number:
34-239-4
Grind Number:
X4270H
Lifter Type:
Hydraulic Lifter
Specifications Intake Exhaust
RPM Range:
1600 to 5800
Valve Lash:
Hyd.
Hyd.
Valve Timing:
0.006
Duration:
270
278
Lobe Separation:
111°
Duration @ .050" Lift:
226
234
Intake Centerline:
107°
Valve Lift:
0.554
0.574
Lobe Lift:
0.32
0.332
Valve Timing @ 0.006 Lift:
Exhaust
Closes 24
ATDC
Opens 74
BBDC
107Valve Timing Diagram
Intake
28 Opens
BTDC
62 Closes
ABDC
Inline image 2Inline image 3
Description
Part Number:
34-239-4
Grind Number:
X4270H
Lifter Type:
Hydraulic Lifter
Specifications Intake Exhaust
RPM Range:
1600 to 5800
Valve Lash:
Hyd.
Hyd.
Valve Timing:
0.006
Duration:
270
278
Lobe Separation:
111°
Duration @ .050" Lift:
226
234
Intake Centerline:
107°
Valve Lift:
0.554
0.574
Lobe Lift:
0.32
0.332
Valve Timing @ 0.006 Lift:
Exhaust
Closes 24
ATDC
Opens 74
BBDC
107Valve Timing Diagram
Intake
28 Opens
BTDC
62 Closes
ABDC
Laughing Gas
Joined: Mar 2011
Posts: 811
Likes: 1
From: West Central Southern MN
When I was doing research on my rebuild I called the ford racing guys at FRPP. I believe he told me anything more than about 215 duration at .050 was too much for the SD system to allot for. I am sure it had something to do with the SD PCM not being able to match the right amount of fuel to the lower idle vacuum created by that big of a cam. I don't even think my cam is that big and I did a MAF swap to make sure it could handle it. My cam is the 34-235-4. I will do a little more research on that cam though.
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Cargo Master
Joined: Feb 2008
Posts: 2,862
Likes: 44
From: Tooele, UT
I heard from Randy Malik on the 429-460 forum and he said that cam was so wrong that the comp cam tech who suggested it should be fired. He said that my heads can't even take that amount of lift without modifications. So I am just gonna have him grind me a custom cam. He seems to have done a lot of good work on these SD EFI systems.
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Laughing Gas
Joined: Mar 2011
Posts: 811
Likes: 1
From: West Central Southern MN
Yeah I thought it seemed like a strange rec also. I trusted my builder to handle the valvetrain issues that might arise from the bigger cam, and he made sure that it was fully functional with my set up before he let me take it home. Hopefully u can get a reasonable price on a custom cam going that route. There are alternatives through the various cam manufacturers that should work for an SD setup.
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95 460 EFI rebuild options
You should review my post "460 EFI Ultimate Build" posted on 9-27-08.
I did a complete rebuild on my 97 F250, 460 EFI w/MAP. This post provides a list of all components used in the build. The end result is a truck that is completely reliable, with greater low end torque and smog legal. The high end power is better than stock, however it is by no means a race truck.
Best Wishes
LO
I did a complete rebuild on my 97 F250, 460 EFI w/MAP. This post provides a list of all components used in the build. The end result is a truck that is completely reliable, with greater low end torque and smog legal. The high end power is better than stock, however it is by no means a race truck.
Best Wishes
LO
Laughing Gas
Joined: Mar 2011
Posts: 811
Likes: 1
From: West Central Southern MN
Covetable, what kind of build are you doing? If you stay with the factory equivalent or EFI friendly cam, you don't need a specific builder. I would just try to find someone whom has built big blocks before.
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