1995 351W Build Help Needed
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Junior User
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1995 351W Build Help Needed
Need to rebuild the 351W in my '95 F250. A stroker is not an option but I am going for torque. A buddy is going to put it together for me but I need to get the parts together. I have been lurking for a while trying to figure out what I need but now that I am ready to build it I have some more specific questions. I already have GT40 heads. I was planning to order
PP Typhoon Lower
Edelbrock Performer Truck Upper (plan to stay in stock rpm range)
Pacesetter LT headers
Should I keep the stock rocker ratio or change to 1.7?
What cam should I run? I assume its a roller cam block but have not looked
Recommended pistons & CR to stay on pump gas?
Is their anything else I may be overlooking?
Thanks for any help.
PP Typhoon Lower
Edelbrock Performer Truck Upper (plan to stay in stock rpm range)
Pacesetter LT headers
Should I keep the stock rocker ratio or change to 1.7?
What cam should I run? I assume its a roller cam block but have not looked
Recommended pistons & CR to stay on pump gas?
Is their anything else I may be overlooking?
Thanks for any help.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Add 1.7 rockers with the stock cam or use the Comp 35-512-8 with the stock rockers.
9.5:1 is about the max CR you can run, no need for anything beyond cast or hyper pistons on a low rpm truck motor.
9.5:1 is about the max CR you can run, no need for anything beyond cast or hyper pistons on a low rpm truck motor.
Elder User
Joined: Mar 2013
Posts: 847
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From: In my house..
Headers are great, be sure to add crossover (H-pipe) directly behind the collectors.
Changing the cam will require recalibrating the MAF Sensor, are you prepared for that expense ?
1.7's are viable alternative that will provide small increase in both torque and horsepower.
Combustion chamber design, total advance and quench has more to do with minimum octane level than the compression ratio.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
No it won't, the MAF calibration file exists inside the PCM and the cam has no impact on it.
Agreed but.. the OP cannot easily change the chamber shape or quench of the heads in use so anything beyond 9.5:1 static CR and the stock ignition advance curve will result in detonation problems given the weight of the vehicle in question.
Elder User
Joined: Mar 2013
Posts: 847
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From: In my house..
No.. the 5.8 version does not.
No it won't, the MAF calibration file exists inside the PCM and the cam has no impact on it.
Agreed but.. the OP cannot easily change the chamber shape or quench of the heads in use so anything beyond 9.5:1 static CR and the stock ignition advance curve will result in detonation problems given the weight of the vehicle in question.
No it won't, the MAF calibration file exists inside the PCM and the cam has no impact on it.
Agreed but.. the OP cannot easily change the chamber shape or quench of the heads in use so anything beyond 9.5:1 static CR and the stock ignition advance curve will result in detonation problems given the weight of the vehicle in question.
For some reason i was thinking there was a change in the intake hose leading to the MAF, which would require the MAF to be recalibrated.
You are correct, he is limited on options and has to stay under or at 9.5 static to be pump gas friendly.
I'm typical Virgo and over-think everything
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Maybe you were thinking of the 5.0 truck intake.. believe it or not the 5.8 version is a fair bit smaller of all things.. what was Ford thinking? But yeah on this displacement the stock intake(and heads) are equally restrictive period and the motor gains both HP and with upgrades to those parts.
Elder User
Joined: Mar 2013
Posts: 847
Likes: 4
From: In my house..
Maybe you were thinking of the 5.0 truck intake.. believe it or not the 5.8 version is a fair bit smaller of all things.. what was Ford thinking? But yeah on this displacement the stock intake(and heads) are equally restrictive period and the motor gains both HP and with upgrades to those parts.
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FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The only aftermarket intake that the stock TB will fit is the Edelbrock EFI Truck, it uses the performer lower with a super long runner upper portion. The ports in this thing are larger and flow better but the runners are tuned even lower than the factory intake so it's really only good if you're looking to maximize low rpm torque from a stockish motor, if you want more HP too it's totally wrong.
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Elder User
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From: Chicago area
I'm just guessing here but I bet Ford figured that since the only vehicles the 5.8L were going into come 1988 were TRUCKS they decided to tune it for low end torque only. The only two models that got a performance 5.8L was the 1995 SVT Mustang Cobra R and the Ford Lighting PU. Both got the GT40 intake. This is one reason that the truck 5.8L responds to even simple mods such as headers, a mild cam, better heads, etc. But to get any real upper RPM power is to change the stock intake.
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