Let's here about those bad 451 .

As the title say let's here your 451
Car weight
Time
Parts

Here's the best I can do right now.

https://www.youtube.com/watch?v=v57RtzL46bo

It's not really very "bad" compared to everything else on here...

Basically a 451 is a 440 in a slightly smaller package. As Mopar used such heavy parts, the first popular 451s, which were made with aftermarket lighter parts, revved quicker and felt stronger than the equivalent displacement mostly stock 440s.

One important thing to remember is cost. Way back when, people were just about giving 400 blocks away. I could have bought dozens of brand new 400 shortblocks in the crate for $400 or less, and used 400s were a $100 block. So when 451boy (AndyF) showed us how to use those cheap blocks, it didn't take long to catch on. And that happened just about the same time as the cheap parts started coming in from China. It was synchronicity. The only thing missing was cheap heads. That's when 440Source bit the financial bullet and developed the Stealth head.
They also talked about a block, but like so many other people have found out, blocks are much harder to cast than heads. So they wisely dropped the block idea, which probably saved the company.

R.

One of my old cars was a '73 DartSport, #3050#.
Low deck 451, Eddy heads CNC ported, 590 purpleshaft, M1 TR with two 750 Quickfuel carbs. 727 with 8" ATI converter, 4.56 gears, 14x32 tires.
9.89 at 136 best. Sixty foot was a 1.36 footbraking. Very fun pump gas combo that's been beat on for years.

[img]http://i1123.photobucket.com/albums...fkg9x.mp4[/img]


Sounds great zippy..
Low deck 451 eagle assembly je dome tops.bullet soils roller 724int. 709ex. Indy intake Ron's toilet injection 727 8 inch 5500 verta 9inch ford with Moser 456 aluminium bolt thru rear ..2x4 squared chassis strut front ladder bar rear glass front end doors deck lid and back bumper all aluminium interior full 7.50 cage...just seeing what most have done or been with the little motor..ohh -1 heads td 1.6 rockers 2.25 custom headers pecan windows

Prosport that's a great runner there..at that weight

Koffel 451 motors ran 10.0's over here in the early 80's (same as the later "Rossi" car), in your average for then 3000lb+ race cars and cost approx £5000. Think they were .043" top ring motors with mega ported 452's, .750 rollers, big CR. Most got the s*it blown out of them as their owners put N20 at them, rather a silly/expensive move!!

Mines not real fast, but I think it runs pretty good for what it is though. It's a low-deck, low-budget 451 combo at .040 over, so 452 cubes. At the time I built it, I was on a shoestring budget; built the whole thing on side work I found for around $5000 total. Found a 400 long block a guy had pulled out of a pickup and let go of of for $75. It's a 230 casting but not the thick web variety. I used a 413 crank I bought for $50, found both locally on Craigslist. Had the crank magged and turned to fit. Block had to go to .040 to clean up, and I had it line honed with ARP studs. Pistons are Iconn flat tops with 5cc reliefs, fitted with Mahle plasma-moly rings. Rods are CAT H-beam (spare me the flaming, it's a budget motor) I had them looked at by my machinist and he said they were good to go. It balanced up with a bobweight of 2314. Its pump gas friendly at 10.5:1, and uses an Engle solid flat tappet cam spec'd by Moparts member Jeff Patterson. It's street friendly at only 252 degrees at .050 on a 109 cl. Square pattern at .573 lift with ProComp 1.5 steel roller tip rockers. Heads are OTB stealths with only springs & retainers swapped out. Intake is an Eddy RPM dual plane, and after 6 years with an old 2nd hand 830, it now breaths through a new annular 1000 HP & exits gasses via Hooker Comp 1-7/8" headers swith 3" cutouts that I open at the track.

Car is a full weight all steel & stock glass, 67 Satellite with every single thing that it came with from the factory in tact and working properly. I weighed it once with the original 383 in it and it was an even 3600 lbs; 3770 with me in it. Since then I think I've shed a few lbs by way of wheels, aluminum water pump & housing, alum heads. I'd guess it at about 3675 with me in it today.

The first weekend I had the car out, I think it went a best of 12.40. Since then, I've managed to whittle nearly a full second off the time slip with only suspension, chassis, & tranny work. Nothing except head gaskets has changed under the hood since the motor was assembled 7 years ago now, with the exception of the carb I mentioned earlier, and I haven't even begun to play withthat yet, it's exactly as it came from Holley. I think I've got it to where I'm making pretty good use of the power it's making. Last time out the car went 11.54 at 114.9, [edit: this past weekend it went 11.50 @115.3] and has 60'd in 1.581. Slow by race car standards, but then it's not a racecar. Although it's become a pretty decent bracket ride and I plan to race it quite a bit this year.

I jump in it and run to the store Every chance I get, hit some local cruise ins, and I took it on the NW drag tour in '15 logging around 400 freeway miles in 3 days with no mechanical issues.

Future plans are to send the heads out to Modern for a CNC port job and good valve-job. Of course the car will need a bar installed if I go any faster..... so there is that......

Much thanks to all the help from some pretty smart guys here at Moparts over the years!

Early 1990's build with Muscle Motors turned down 440 crank, 440 rods, ROSS dished piston, and Koffels B1-B/S heads (Unported) using Mopar M1 4150 single plane intake. Used a mild Ultradyne solid street roller 251/251 @ 0.050" duration, and I think about 0.600" lift?

In the 4,150 lb Charger set for street driving, and at Bandimere Speedway (DA usually way over 7,000 ft) would run consistent 12.5 @ 110 MPH.
Took it to Las Vegas, and off the trailer, no tuning, went 11.8s @ 115+

This was with 3.91:1 gear, 3,500 stall converter, 10.5"x27" M/T Street ET tires.

Stock block,crank,60 over,10.5 compression Hughes cam (487 lift can't remember all the spec's)ported 906's 3500 lbs 11.30's
2116-117.

68 charger 3840lbs
10.9s with only 2 times at the track (primarily a crusier)
stock crank,rods,comp 286xr,eddy rpm heads ported,eddy rpm dual plane ported,850ootb,1 7/8 hookers,727 4900stall,dana 60 4.10s

451

500hp/500tq

Turned down 440 crank
eagle rods
compression 10 to 1
Crane roller cam
holley street dominator
Stealth heads
exhaust manifolds



It was built to look stock ad go in my 74 Roadrunner.

Plans changed and it wound up in my 67 Charger.
3900 pounds race ready
Only made two runs lat year 12.1@112 or so.
I put some headers on it for this season so it should get into the 11's
runs on pump gas and no drama.

it is a nice change

RB with MP stage 6 heads and .700 lift roller cam, 3300 with driver, 5200 stall, HP950 carb, 10.39 @ 130mph.

Which roller cam?

From about 20 years ago......it's a "452"(4.380 bore).

400 block, 440 crank cut down, BME rods, Ross domes(12.5cr), mild port std stage 6's(300cfm), UD roller, RB TG4500, 1150 carb, 2-1/8x4 headers.
650hp/565tq.

Went a best of 9.31 @143 in a 2700lb S/G Cuda.

RB 451 from a few years ago:

Ross domes(13:1), ported MW SR heads(340cfm), 440-3, 1050 carb, .650 comp roller, 2-2 1/8x4 headers...... 712hp/600tq.

Never got run in a car like that. Sold the top end, then sold the bottom end to a member here, put his ported rpm heads on it with a flat tappet cam, victor w/adapter 1050, made 650hp..... Has gone 10.0's @131 at 3470lbs.

Nice runners for sure guys keep it coming

Mine surely isnt the fastest but it does pretty good for what it is.

.055 over 440
stock stroke
K1 Hbeam rods
Arias piston (12.2-1)
Crane .620 solid cam
Crane gold roller rockers
MP aluminum 452 heads (76 cc) unported
Tick Flow Track Heat intake
950 cfm Holley E85 carb

best 1/8 et is 6.72
best 1/4 et is 10.74

I like this info; especially the combos similar in description to mine. Gives me ideas about where I stand regarding my combo (see sig line). Thanks earthmover for starting this thread.

Ragnar in Iceland

Yes it is a good thread my rb 451/452 is also in my sig

Lenny Melton's Dart (8secDart) was an impressive runner. 451" low deck w/ 440-1 Indy heads, single dominator, cast Indy manifold, one stage of nitrous and 10" tires in a street legal '68 Dart. Ran 8.60s at over 3000 lbs.

I still got 2 451s and they both have run 5.49 at 265mph 15 years ago.

And I never drained the "breakin" oil lol before running them. I have never changed the original oil in any motor that I built or any motor from a car factory.

I have made more power than anyone on this board.

Thanks I'm trying to get a feel of about what my old turd should do ..hopefully I'll get it out this year if not I'm going to sell it and move on to my street car..

Slacker

68 Barracuda-3200# with driver-10:1, stock edelbrock rpm heads, mod man dual 4/w 750 edelbrock's, 280/575 solid cam, 1.5 rockers, 4.10 with 10.5 x 30 hoosier radials. 10.39 at 129 mph

WGAF

I was wondering the same thing...

I'm debating a 451 also. So let's hear more

Something must be in the water I'm on the fence about selling mine

Lol well went through a divorce and and now property fight..i. self employed I own a couple dump trucks that keep me busy either working or working on lol.. would live to make some passes even build a new bigger motor I just have to get back in it..life will beat you down sometimes..just have to figure out what matters the most now days..

Sorry to hear about your situation the nice things about Race cars we can push them in the corner until whenever

First off....there weren't many 451 low decks around (only in magazines) back then but.....I had a 383 rod 451 Low deck back in early 91's, home ported big valve 452's, Venolia zero deck flat tops, A Lunati 30307 520/547 lift 240/250 @ .050 duration with an M1/worked 830 Annular and 2" Pro-parts headers mated to Flowmaster 4-2-1's phased at 180. It had a 10" Fairbanks that stalled around 3400 and a 3.91 8 3/4 with McCreary Dirt Track tires. It was in a 73 duster and it ran high 6's in the 1/8th at about 100-101. Really quick for it's day as a street car and for what it was.

I had a Weiand Team G on it to try and it dropped off like 3/10ths, tossed that boat anchor in the drink. Thing wouldn't fall out of a tree with that manifold on it.

I'm not sure. I bought it uses with a bunch of parts

It's a Comp 308R

I added a set of Hooker Comp headers.

It runs a 11.55 @ 115 mph

My prior motor...rb 451 with stock crank and rods. 10.6 comp forged pistons wiseco, with lightly cleaned up rpm heads with rpm intake and mp 557 cam. In my 68 charger at 3900 lbs, it ran consistant high 11.30’s to low 11.40’s at 119-120mph. Thats with manual tranny and 4.30 gears.

Late 90's built 400/451. 12.5-1 Ross, eagle rods, 440 crank, comp 660 roller, ported Indy SR,Indy intake, 1090 demon, in a 71 Demon, street trim, 28", full exhaust, 3350lb, went 10.0 at 133.

A little different combo:

451 SMALL BLOCK

4.100" stroke x 4.185" bore

hopefully north of 900hp N/A

'71 Demon at 3000lbs

Should run in the Mid 8's

That's not fair.

All is fare in love and war.

440 .055 over.
Just shy of 4100 with me
Best of 10.88 @ 123.
4.30 Dana with spool on 30x9 Hoosier
8” PTC with a low gear set 727.

Here goes the build.

440 Indy EZ-1 With Roller Cam

75 440 Block .055 Over No fancy torque plate hone. Wish I had though.
Stock 440 Forged Crank, -.020/.020 on Rods and Mains, CB527P20, MS1277P20
SH876S Cam Bearings, 
ARP 627-3000 Main Bolts
Indy EZ-1 Max Wedge Heads, 2.19/1.81, PAC 1386 @ 1.925" 280/640, 513 SR
Intake Lift      Flow     Exhaust Lift      Flow
            .100     71.8                   .100      59.3
            .200    128.0                 .200      96.7
            .300    190.6                 .300     130.7
            .400    246.5                .400     158.0
            .500    300.0                .500     183.8
            .600    337.9                .600     200.7
            .700    349.3                .700     213.6
            .800    343.4                .800     221.1
T&D 1.6 Rockers 8215
Pushrods Manton Series V, 3/8 .120" 9.710 EL
NGK R5671A-8 Plugs, Gap .035
Comp Mechanical Roller Cam,
Custom Grind
.721 lift Intake .711 lift Exhaust .451/.445
268 Intake
276 Exhaust
110 Center Grind @ 106
Jessel Roller Lifter S905820-50
Cloyes 9 Way Billet Timing Chain 9-3625TX9-5
Indy Single Plane Manifold
AED 1050 Dominator 
91 jet, PIB .070, PHS .031 SIB .070 SHS .031
IB .059 SQ .035
MSD 7AL-3 7230
MSD Distributor 85463 (Locked Out)
JE SRP Forged Race Pistons .055 11.01-1 CR 213458
Total Seal File Fit Rings, CR9190-130, 1/16, 1/16, 3/16, .020,.020 Gap
Eagle H Beam Rod, .990 Pin, 6760B3D
1009 Fel-Pro Head Gasket, .040 Thick
Manley Head Bolts 42198
ATI Balancer 917122E SFI 18.1
Dougs Headers D452 
Moroso Vac Pump 22641

For what is in it and how heavy the car is I can’t complain.