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Author
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Topic: How much better is a 351 boss over a standard 351?
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stinger
Gearhead Posts: 168
From: mn
Registered: Feb 2003
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posted 03-31-2003 06:06 PM
   
Thanks!
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Inbred-Jed
Journeyman Posts: 40
From: Chester, Wv 26034
Registered: Mar 2003
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posted 03-31-2003 06:36 PM
To my knowledge the Boss came with some better components. I believe the crank had a higher nodularity and it had better valves. Other than that im not real sure. Not a real big difference. With todays aftermarket and availability you could build something to beat its a## pretty easy.
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Fastymz
Moderator Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-31-2003 06:44 PM
I think the Boss had cleveland heads ?------------------
SCOOP
oddly obsessed with big scoops on little Mustangs "Experience is what you get when you didn't get
what you wanted." 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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bluestreek
Gearhead Posts: 1289
From: Athens,GA
Registered: Jul 2001
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posted 03-31-2003 07:12 PM
I race a guy at the track that has one. He's picking my brain for ideas to get his car faster. He told me that the Boss mainly consisted of better block, rods and pistons than the standard and come with a factory setup for a solid lift cam. Kinda like a HiPo version of the 4V Cleveland. Bone stock he as running 13.20s @ 105 mph with only 2.20 60' times. It aint no slouch!------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph
DanH
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SteveLaRiviere
Administrator Posts: 33371
From: Saco, Maine
Registered: May 99
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posted 03-31-2003 07:13 PM
The Boss also had a solid cam, along with guide plates, 7/16" studs and adjustable rocker arms. like Jed said, the valves were single groove keepers, which were tons better than the multigroove design keepers. The pistons were forged domes, compression ratio was 11.7:1, IIRC. The blocks were 4 bolt mains, the cranks were selected for high nodularity, the rods were shot peened and fitted with better rod bolts. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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mustangboy
Gearhead Posts: 652
From: Ont, Canada
Registered: Mar 2002
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posted 03-31-2003 08:25 PM
It was very close to being the fastest of the older style mustangs and it was in the biggest body style!How's this for standard equipment.
.Competiton suspension with staggered shocks
.mandatory 4 speed manual
.power front disks
.heavy duty cooling package
.Dual exhaust
.3.91 Trac Lok differential
.functional ram air hood
.330 hp@5400 and 370ft/lbs torque@4000
.Not too shabby for a small block.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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rm302 boss
Moderator Posts: 582
From: Austin Texas
Registered: Dec 2002
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posted 04-01-2003 10:39 PM
quote:
Originally posted by SteveLaRiviere:
The Boss also had a solid cam, along with guide plates, 7/16" studs and adjustable rocker arms. like Jed said, the valves were single groove keepers, which were tons better than the multigroove design keepers. The pistons were forged domes, compression ratio was 11.7:1, IIRC. The blocks were 4 bolt mains, the cranks were selected for high nodularity, the rods were shot peened and fitted with better rod bolts.
It ia also what they referd to in 70 as just a 4v 351c...stock was 300 hp... this is the power plant i started with in my 70 Steve.
Rene ------------------
1970 Boss 302
1990 Taurus SHO
1985 Mustang GT 351W
1995 Land rover Disco
1980 Triumph Spitfire (auto-X car)
http://mustangsandmore.50megs.com/MembersPics/rm302boss.html
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SteveLaRiviere
Administrator Posts: 33371
From: Saco, Maine
Registered: May 99
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posted 04-02-2003 08:03 AM
quote:
Originally posted by rm302 boss:
It ia also what they referd to in 70 as just a 4v 351c...stock was 300 hp... this is the power plant i started with in my 70 Steve.
Rene
No, the Boss 351 was different. The '70 351C 4V had a hydraulic cam, nonadjustable rocker arms which sat in notched stand bosses held down with 5/16" bolts, the pistons were cast flat tops, compression ratio was 10.7:1 and the rods and crank were standard items. I think they were 2 bolt main blocks, too. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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Hans olsson
Gearhead Posts: 293
From: Sweden
Registered: Apr 2000
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posted 04-02-2003 10:30 AM
The NHRA rates the Boss at 355 HP and the 4V at 310 HP in Stock Eliminator.-70 and -71 4V was pretty much the same.
 ------------------
- 71 Mach1 351c
- E/SA 11.89-110 mph
- F/SA 11.76-111 mph
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