Re: 400 to 500 life span
[Re: SILVER67]
#453739
08/29/09 09:05 PM
08/29/09 09:05 PM
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Joined: Jan 2003
Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
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A couple of friends that bracket race 440 combos with stock eddy heads with a 440 shortblock and 590 cam average 600 runs, then head work. Shortblock, the stock cranks they run last maybe 1000 runs and crack. If you have a new forged crank, run an aircleaner, and take good care of it, I don't think you would need more than a top end freshen for at least five years, at say 120 runs a year. Even though the stroke is longer, I would bet it will hold up well.
Last edited by gregsdart; 08/29/09 09:07 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 400 to 500 life span
[Re: SILVER67]
#453741
08/29/09 09:57 PM
08/29/09 09:57 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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I'll let you know in a few years I had the same thoughts about the pistons, but they seem fine, only time will tell. With my combination, I am more concerned with the valve train and valve spring life running a 0.715" lift cam. Anyhow, years ago (about 15 years ago) I got alot of grief for running stock rods in my 451 stroker. My response was "if it breaks, I'll build a bigger one" When it did break a few years ago, it was a broken intake valve that caused the damge, the short block still looked good except the hole in the top of the piston when the valve head broke off.
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Re: 400 to 500 life span
[Re: SILVER67]
#453742
08/29/09 10:20 PM
08/29/09 10:20 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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I built my 512 pump gas 400 stroker (then) for pump gas racing on the streets of Los Angels with no power adders. I have upgraded parts on it since then, CNC ported Eddy RPM heads the second year because I could afford it and later change the crankshaft from 4.25 stroke to 4.300 stroke to increase the compression from 9.25 to 1 to 10.29 to 1 The pistons, rods, rings and bearings are the same ones in the motor now as was in it in 2003 when I built it. it has around 400 runs on it and probally between 1500 and 2000 street miles so far. That combination runs fine, I shift it at or above 7000 RPMs becuase the motor likes it and runs the fastest shifting it there. The car is 3400+ lbs with me in it, 1971 Duster full three inch exhaust and Hooker fenderwell headers on M/T ET Street bias and radails tires, 10:34 ET at 128.6 MPH best running out of fuel It will run faster this year now that I have replaced the fuel pump with a bigger one I run a 7.800 long H beam rod and the piston is really short
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 400 to 500 life span
[Re: Cab_Burge]
#453743
08/29/09 10:36 PM
08/29/09 10:36 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
I built my 512 pump gas 400 stroker (then) for pump gas racing on the streets of Los Angels with no power adders. I have upgraded parts on it since then, CNC ported Eddy RPM heads the second year because I could afford it and later change the crankshaft from 4.25 stroke to 4.300 stroke to increase the compression from 9.25 to 1 to 10.29 to 1 The pistons, rods, rings and bearings are the same ones in the motor now as was in it in 2003 when I built it. it has around 400 runs on it and probally between 1500 and 2000 street miles so far. That combination runs fine, I shift it at or above 7000 RPMs becuase the motor likes it and runs the fastest shifting it there. The car is 3400+ lbs with me in it, 1971 Duster full three inch exhaust and Hooker fenderwell headers on M/T ET Street bias and radails tires, 10:34 ET at 128.6 MPH best running out of fuel It will run faster this year now that I have replaced the fuel pump with a bigger one I run a 7.800 long H beam rod and the piston is really short
assuming a 9.98 deck and 4.3 stroke with 7.8" rods, you wouldn't have any room for a piston at all.
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Re: 400 to 500 life span
[Re: 451Mopar]
#453746
08/30/09 12:36 PM
08/30/09 12:36 PM
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Joined: Sep 2003
Posts: 2,008 Sweet Home Alabama
MRMOPAR622
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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My 528 Indy Maxx aluminum block has a finished deck height of 9.965 Bore 4.50 Wiseco pistons with the compression height 1.300 BME rods 6.570 center-center stroke 4.15 the crank has the RB(440)mains. I have the 572-13 heads. I have the engine apart now,I had a roller on the lifter go out and some of it got picked up by the oil pump and spun a bearing. What is the most cu. in. I can get out of this 9.965 deck height with 4.50 bore what stroke crank what lenth rods what compression height pistons should I use.Thanks
Last edited by MRMOPAR570; 08/30/09 12:58 PM.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: 400 to 500 life span
[Re: MRMOPAR622]
#453747
08/30/09 12:54 PM
08/30/09 12:54 PM
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Joined: May 2008
Posts: 902 Mopar Lane,Mississippi
67HEMI
super stock
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super stock
Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
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My car has a .040 400 block with a 4.15 stroke.Indy lil ez 295 heads and Indy intake and 11.5 static compression. The cam is a Comp Roller 268/276 @ .050 with .704 lift. It has been built 3 years,runs on pump gas,drag radials and mufflers. Just rolled over 3,000 street miles and around 100 1/4 mile passes. The only work done to it is I have adjusted the valves 3 times and changed the oil 5 or 6 times.I changed the plugs once. About 2 months ago I did a compression check and they were all 185 to 190 psi.Best ET to date is a 10.22 @ 129mph with a 1.419 60 foot on Mothers' Day weekend in Memphis.It weighs 3800 with me in it.
'33 Plymouth 5 Window Coupe Blown Aluminum HEMI w/bolt ons (under construction)
'69 Chrysler 300 Convertible 375 HP 440
'71 Plymouth Duster 360 W/EFI (Wife's Ride)
'12 Ram MegaCab Dually 6.7 Cummins
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Re: 400 to 500 life span
[Re: 67HEMI]
#453748
08/30/09 12:58 PM
08/30/09 12:58 PM
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Joined: May 2008
Posts: 902 Mopar Lane,Mississippi
67HEMI
super stock
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super stock
Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
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Oh I shift at 6500 and go through the lights at 68-6900.
'33 Plymouth 5 Window Coupe Blown Aluminum HEMI w/bolt ons (under construction)
'69 Chrysler 300 Convertible 375 HP 440
'71 Plymouth Duster 360 W/EFI (Wife's Ride)
'12 Ram MegaCab Dually 6.7 Cummins
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Re: 400 to 500 life span
[Re: MRMOPAR622]
#453749
08/30/09 01:03 PM
08/30/09 01:03 PM
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Joined: Jan 2003
Posts: 9,875 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
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The way you describe it your Longevity should be very good. The reason is you're camming it to take full advantage of the broad torque the motor will make inherently. The 512 Low deck B with a 4.25" stroke and the 6.535" rod and (same as a 451/6.76 combo) 1.30-1.32" CH piston is to my thinking anyway is the "new" 451, upsized to take advantage to so many head choices we never even imagined having 20 yrs ago when we were frankensteining these strokers with stock rods and "custom pistons). A 511 is a perfectly streetable and very durable combo with about the same rod and close to the same bore to stroke geometry as an OEM 454 chevy. The RB version is also a very sound combo though maybe not QUITE as strong in the main webs as the little brother block. Longevity goes down on a dual purpose motor when you cam the motor to put the torque peak too far upstairs where you need real heavy springs and optimized tuning way up at the top for the best power. To me that's where the below the peak VE and drivability suffer so the motor's is only running in it's optimum state maybe 20% of the time cause the rest of the time you're just running part throttle. My philosophy is to cam it to maximize the mid range (similar to an Engine Masters 2500-6500 highest average torque/power band) but put the very best flowing heads you can afford on it so in reality you're actually giving up very little on the big end compared to maybe a more agressively cammed motor with lesser heads...This is because your better haed flow isn't as peak lift and duration dependent to feed the volume a t the higher piston speed s 'cause the ports are adequately carrying the load. Take a look at Mike Duarity's (props the the NC boys!) high 10 off the bottle/low 10 second on spray 3.23 geared 512" super bee. It's in the October Mopar Action. Guys that think you need 4500 carbs ,4.30 gears and 4500+ stalls to make a 500" motor run strong (assuming a non 'full-race' street-strip type combo) could consider rethinking the combo; especially if you can run as quick or faster with much better (very near stock) street manners. Not say you CAN"T go fast or there's anything wrong with a more agressive combo, it's just to me kind of a waste of juicy torque and the $$$ you invest in the motor to move (or think you HAVE to move) most of it all upstairs. I do know that taking an inherent TORQUE motor and making it a HORSEPOWER motor will tend to be harder on parts just by virtue of the higher drivetrain shock loads and piston speeds. I think you're heading the right direction, I'd look at a max wedge port window (Like the Super Victor, -1 or EZ-1) and the Indy Dual plane and a 950 or 1000HP 4150 carb if you're wanting a more efficient highway speed/street efficient stall and mid to high 3 gears. Even in what we would call a "mild" state of tune you're looking at you'll still have the oats to click off effortless low 11's at close to 120 mph in street trim and well into the 10's with Cal tracs, a loosened front suspension and good tires.
Last edited by Streetwize; 08/30/09 01:24 PM.
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