451 short block ???
#1070948
09/07/11 03:19 PM
09/07/11 03:19 PM
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Joined: Aug 2007
Posts: 2,449 nc
earthmover
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,449
nc
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got a chance at a 451 short block at a good price...want to ask a few ??? on this before i try to pull the trigger...short block has 14.1 comp pistons with 72 cc heads (my heads are 72cc as well) it has a 690 roller,mil gear drive, with billet mains,and studs,good crank and rods..now what kinda power could i see with this motor ..my heads should go 350 with the bigger valves and gasket matched (2.25 val) -1 with t&d 1.6 rocker,intake i guess i will look for the 400-2 as i have a 440-2 for a 440block with the 2" spacer,buddy has a nice 1150 carb... all this will be fit to a 727 trans no brake as of now,either 8" 5600 verta or 9.5 5000 verta, in a 70 duster about 2900lbs right now...suspension will be up graded to backhalf ladder bar with coil over and a dana rear.. will this combo get me down in the low 6's in the 1/8 mile without much trouble?????just getting a feel of this before i go ahead and buy the short block thanks mike
Last edited by earthmover; 09/07/11 03:25 PM.
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Re: 451 short block ???
[Re: earthmover]
#1070949
09/07/11 03:30 PM
09/07/11 03:30 PM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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It will run well. It will want to RPM though. Shift points will be 7200+, to make it run half way decent... Get the a loose converter, and leave the line at 6K will help. Those -1's can be a hair lazy down low in moderate heavy car 3000 lbs+ and usually soft in 60ft times. I ran a similar combo with CNC ported -1's from Modern, jesel rockers bla bla bla. In a moderately heavy 3400 lbs Dakota... It would 60ft lazy in the mid 1.30's range but run out the strip with killer MPH 114+ (im taking stock stroke here) The compression will help if its really 14:1.... Even with those tight 72cc chambers the pistons are probably blob domes near 20 CC.. Its just very difficult to get a 3.75 stroke engine to 14:1.. thats all.
Last edited by Bob_Coomer; 09/07/11 03:31 PM.
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: 451 short block ???
[Re: Bob_Coomer]
#1070951
09/07/11 03:43 PM
09/07/11 03:43 PM
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Joined: Jan 2003
Posts: 4,074 Shelby Twp. Mi
HardcoreB
master
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Posts: 4,074
Shelby Twp. Mi
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Quote:
) ... Even with those tight 72cc chambers the pistons are probably blob domes near 20 CC.. Its just very difficult to get a 3.75 stroke engine to 14:1.. thats all.
Good point. It would probably run better milling more from the heads and lopping off the domes(the pistons intake pocket will most likely need radial clearence anyway w/ a 2.25 int), provided you have enough P-2-V depth. Honestly, I would consider a custom ground cam for about $200 more.(factor-in selling the current cam)
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Re: 451 short block ???
[Re: HardcoreB]
#1070952
09/07/11 03:54 PM
09/07/11 03:54 PM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
mopar
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mopar
Joined: Mar 2008
Posts: 553
Kentucky
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Just a thought
If it is stock block, you may be making more than a stock block will like for very long, especially at 7500 rpms and 14:1. It looks like you have enough head flow and cam to go 700+.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 451 short block ???
[Re: earthmover]
#1070954
09/07/11 05:17 PM
09/07/11 05:17 PM
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Joined: Apr 2004
Posts: 976 Woodstock , Georgia
Mopar_racer_99
super stock
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super stock
Joined: Apr 2004
Posts: 976
Woodstock , Georgia
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No problem there we used to run 6.10 1/8 and 9.79 1/4 in a 2900 lb charger with same combo. John
8.72 @ 154.6 ,68 Charger 578ci 440-1s, 3000# w/drvr, 2150 den/alt NA
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Re: 451 short block ???
[Re: earthmover]
#1070955
09/07/11 05:22 PM
09/07/11 05:22 PM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Keep the camshaft to a moderate size. It would be easy to over cam this one, and not being able to make it up in the upper revs, it will not see. Id shoot for a cam that would make the good cylinder pressure. Id look for a cam in the mid 250's to low 260 for dur@50 with as much lift as you can get. Id use a 6K minimal converter, and 4.56' to 4.88's gears depending on tire height. I switched over to a toilet setup mid year and that thing really made the power down low. I really like that alky injection system. Easy to tune etc.
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: 451 short block ???
[Re: earthmover]
#1070957
09/07/11 07:26 PM
09/07/11 07:26 PM
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Joined: Jan 2003
Posts: 4,852 KENTUCKY
69CHARGERMD
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Posts: 4,852
KENTUCKY
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Not sure how much of my combo relates to yours,,but thought i would post mine, (Porter Racing did the motor)
451, tall fill, .055 over ross dome pistons BME rods Ohio Crank 4340 stock stroke Flat tappet cam 304/304, 272/272, 108 lsa, 650 lift w/1.6 rockers 13:1 compression Victor intake, Dominator 1050 edelbrock heads made 650 HP @7200 and 564 tq at 5800
this is in a 3450 lb Belvedere.
Best ET so far,,(foot braking),,,was a 10.08 @ 131MPH
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Re: 451 short block ???
[Re: earthmover]
#1070959
09/07/11 08:48 PM
09/07/11 08:48 PM
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Joined: Oct 2003
Posts: 1,170 Westbury, NY
bumps440
super gas
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super gas
Joined: Oct 2003
Posts: 1,170
Westbury, NY
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Quote:
nice
Sound like you want what I had. but yours will be better( easier).
I had 3225 lbs, Ported stage IV 2.14/1.81 lucky if they flowed over 285 or so. . 13.75 -1 tarantula manifold, 4780 carb..( 800 cfm Lunati roller, 276/284 108 .690 w 1.5s. I used 1.6 harland sharps. 9" J type convertor,( 5200 stall. shifted at 7000 hit the stripe at 7500. 5.38s and 14x32s on 12" rim.
What is your cam?
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Re: 451 short block ???
[Re: earthmover]
#1070961
09/07/11 11:25 PM
09/07/11 11:25 PM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
mopar
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mopar
Joined: Mar 2008
Posts: 553
Kentucky
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Doug
Did you get a bob weight for your engine from Dwayne?
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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