New 351m Power
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New User
Joined: Jan 2005
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From: jersey
New 351m Power
Whats up guys, I just got my 351m worked a little. It has alot more power then it did before the work. Im still tuning the beast and getting full dual exhaust done next week, headers back.i got dynomax ceramic coaters. now I wanted to know if anyone can throw a dyno sim or horsepower and torque rating on what i got .
Crane blueracer cam: <TABLE border=1><TBODY><TR><TD>Grind Number:</TD><TD>270-2H</TD></TR><TR><TD>Operating Range:</TD><TD>1500-4000 RPM</TD></TR><TR><TD>Duration Advertised:</TD><TD>270° Intake / 280° Exhaust</TD></TR><TR><TD>Duration @ .050'' Lift:</TD><TD>204° Intake / 214° Exhaust</TD></TR><TR><TD>Valve Lift w/1.73 Rockers:</TD><TD>.484'' Intake / .510'' Exhaust</TD></TR><TR><TD>Max Lift Angle:</TD><TD>107° ATDC Intake / 117° BTDC Exhaust</TD></TR><TR><TD>Lobe Separation Angle:</TD><TD>112°</TD></TR><TR><TD>Open/Close @.050'' Cam Lift:</TD><TD>Intake - (5°) ATDC (opens) / 29° ABDC (closes)
Exhaust - 44° BBDC (opens) / (10°) BTDC (closes)</TD></TR></TBODY></TABLE>
heads milled for 9 to 1 comp.,guideplates w/ screw in studs,comp cam roller tip rockers,stock size hd valves,ported and polished heads (79 351m heads), true double roller timing set striaght up and new duraspark dizzy.my exhaust will be 2 1/2 from headers to hi-flow cats all the way. 93 octane. Thanks guys and sry for the long *** post.
Crane blueracer cam: <TABLE border=1><TBODY><TR><TD>Grind Number:</TD><TD>270-2H</TD></TR><TR><TD>Operating Range:</TD><TD>1500-4000 RPM</TD></TR><TR><TD>Duration Advertised:</TD><TD>270° Intake / 280° Exhaust</TD></TR><TR><TD>Duration @ .050'' Lift:</TD><TD>204° Intake / 214° Exhaust</TD></TR><TR><TD>Valve Lift w/1.73 Rockers:</TD><TD>.484'' Intake / .510'' Exhaust</TD></TR><TR><TD>Max Lift Angle:</TD><TD>107° ATDC Intake / 117° BTDC Exhaust</TD></TR><TR><TD>Lobe Separation Angle:</TD><TD>112°</TD></TR><TR><TD>Open/Close @.050'' Cam Lift:</TD><TD>Intake - (5°) ATDC (opens) / 29° ABDC (closes)
Exhaust - 44° BBDC (opens) / (10°) BTDC (closes)</TD></TR></TBODY></TABLE>
heads milled for 9 to 1 comp.,guideplates w/ screw in studs,comp cam roller tip rockers,stock size hd valves,ported and polished heads (79 351m heads), true double roller timing set striaght up and new duraspark dizzy.my exhaust will be 2 1/2 from headers to hi-flow cats all the way. 93 octane. Thanks guys and sry for the long *** post.
Cargo Master
Joined: May 2003
Posts: 2,561
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From: Earth
Originally Posted by danlee
The torque is 305@2000 RPM, peak 350@3500 RPM. The HP is 278@5000 RPM.
We're going to have to start calling you "DynoDan."
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
Originally Posted by danlee
The torque is 305@2000 RPM, peak 350@3500 RPM. The HP is 278@5000 RPM.
I forgot the headers, the one above was with stock exhaust.
Torque is 355@2000, peak 390@4000 RPM. The HP is 337@5000 RPM.
On a 400 (same CR) we get:
Torque is 408@2000, peak 425@3500 RPM. The HP is 326@4500 RPM.
The longer stroke flattens it out quite a bit.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
[QUOTE=We're going to have to start calling you "DynoDan." [/QUOTE]
I run these simulations for this group because I have all the parameters set up. If I had to do another motor, I would have to spend time looking up details.
[/QUOTE]I run these simulations for this group because I have all the parameters set up. If I had to do another motor, I would have to spend time looking up details.
Senior User
Joined: Jun 2004
Posts: 258
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From: lancaster ohio
yeah danlee your info makes you some kind of info god. thanks for all the effort on the
contration. did you get that PM? i havent forgot.
contration. did you get that PM? i havent forgot.
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New User
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From: jersey
thanks danlee for the reply . so thats what my numbers should be then after i get it all tuned in. im very pleased with those numbers. thanks guys .
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Fleet Mechanic
Joined: Jan 2003
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From: Central Ohio
Danlee is definately master of the computer dyno 
keep up the good work! Someday I will have a build for you to dyno...
Thats actually the first time I have seen a 351M dyno'd.... usually everyone goes for the 400. Its interesting to see that the 351M actually peaks higher HP than the 400, although I did figure it would get some extra rpm's due to the shorter stroke. I have thought about building my 351M for extra power and good milleage... but the main problem I have heard is the unusually tall piston. I have been searching for a longer rod / shorter piston combo for the 351M but havent found anything. What I really wanted was a zero deck 351M with longer rods, ausie heads, and pistons machined to match the closed chamber heads and yeild about 9.5 CR.
keep up the good work! Someday I will have a build for you to dyno...Thats actually the first time I have seen a 351M dyno'd.... usually everyone goes for the 400. Its interesting to see that the 351M actually peaks higher HP than the 400, although I did figure it would get some extra rpm's due to the shorter stroke. I have thought about building my 351M for extra power and good milleage... but the main problem I have heard is the unusually tall piston. I have been searching for a longer rod / shorter piston combo for the 351M but havent found anything. What I really wanted was a zero deck 351M with longer rods, ausie heads, and pistons machined to match the closed chamber heads and yeild about 9.5 CR.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Horsepower equals Torque X RPM. The 400 produces higher torque, but the HP peaks at a lower RPM due to the larger displacement. It is the air handling that limits the RPM. Since the 351M and 400 both intake and exhaust the same amount of air, then the 400 cannot rev as high. Since the RPM is less, the 400 puts out less Horsepower. Increase the breathing capability of either motor and the Horsepower will go up, as well as the RPM.
Senior User
Joined: Feb 2008
Posts: 122
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From: El dorado, Arkansas
I am so glad that I found this site. I have an 81 f150 with a factory reman 351m. I can't find anyone that really knows anything about them. Most of my family are mustang fans including myself. I bought the truck because I have always liked the body style. I don't really know what I can do to it though. I am giving it to my son for his 16th b-day. Dan do you think you could give me a ballpark on the ratings. It is stock except when I bought it it came with a single plane intake and I believe it is a 650 edelbrock 4 barrel. True duals with stock manifolds. Exhaust is only 2" though. C6 tranny and 9" rear. The motor only has about 4k miles on it. Thanks for any info.
Postmaster
Joined: Aug 2001
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From: Delaware
Originally Posted by brthevio
Dan do you think you could give me a ballpark on the ratings. It is stock except when I bought it it came with a single plane intake and I believe it is a 650 edelbrock 4 barrel. True duals with stock manifolds. Exhaust is only 2" though. C6 tranny and 9" rear. The motor only has about 4k miles on it. Thanks for any info.
A set of headers will help, and a good aftermarket cam timing set with the timing set to 'straight up'.
What kind of single plane manifold does it have? Some are better than others, but for best power at low RPM it should have a dual plane intake.
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