Which RB Stroker Kit?
#498659
10/16/09 03:20 PM
10/16/09 03:20 PM
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Joined: Jul 2005
Posts: 487
St Louis, MO, USA
srunge55
OP
mopar
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OP
mopar
Joined: Jul 2005
Posts: 487
St Louis, MO, USA
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I'm looking at a couple kit for my mostly stock looking street car. Which would you go with?
1. Mancini - 4.125 Eagle Crank, 6.7 Eagle H beam rods (2.20 journal, .990pin), Diamond Dish pistons (4032 alloy). Kit is $1450 unbalanced.
2. 440 source - 4.250 crank, 7.1 rod, Ross Dish piston (2618 Alloy). $1897 balanced
3. Any other good deals/options?
Price looks pretty good on the Mancini kit is something wrong with that setup?
Thanks,
Steve
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Re: Which RB Stroker Kit?
[Re: srunge55]
#498662
10/16/09 05:05 PM
10/16/09 05:05 PM
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Joined: Jan 2003
Posts: 74,976
U.S.S.A.
JohnRR
I Win
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I Win
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U.S.S.A.
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Quote:
I'm looking at a couple kit for my mostly stock looking street car. Which would you go with?
1. Mancini - 4.125 Eagle Crank, 6.7 Eagle H beam rods (2.20 journal, .990pin), Diamond Dish pistons (4032 alloy). Kit is $1450 unbalanced.
2. 440 source - 4.250 crank, 7.1 rod, Ross Dish piston (2618 Alloy). $1897 balanced
3. Any other good deals/options?
Price looks pretty good on the Mancini kit is something wrong with that setup?
Thanks,
Steve
4.125 stroke and a 6.700 rood , that doesn't look right .
Do yourself a HUGE favor and DO NOT PAY for a balanced kit , have it balanced by the local shop doing your work. A cheap balance job is just that , a cheap balance job .
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Re: Which RB Stroker Kit?
[Re: srunge55]
#498663
10/16/09 05:36 PM
10/16/09 05:36 PM
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Joined: Jan 2003
Posts: 7,497
Austin, TX
HemiDave
master
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master
Joined: Jan 2003
Posts: 7,497
Austin, TX
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Quote:
I do have your book Andy and have read most of it. Very good read - congratulations. You seem to favor the 4.25 stroke (or so it seemed to me). Any particular reason other than cubes? I will look into some of the other kits but the 4.125 Mancini kit seems to be a very attractive price compared to what I have seen so far.
I did see an earlier post where you were talking about running HP manifolds on your 470. I thought you said you were trying the same on a 512. How did that turn out, did you use the .528 MP cam on that also?
Steve
I'm kinda in the same situation...deciding on a 512 or a 528. I'm gonna use stock manifolds, also. I'll wait to see what Andy says.. 
Dave
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Re: Which RB Stroker Kit?
[Re: srunge55]
#498664
10/16/09 05:39 PM
10/16/09 05:39 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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that Mancini kit looks like it uses chevy rods.
that 440 source kit... 7.1 rod? geez.. how far up the piston does the pin sit?
cant see that lasting very long.
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Re: Which RB Stroker Kit?
[Re: srunge55]
#498668
10/16/09 09:34 PM
10/16/09 09:34 PM
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Joined: Jan 2003
Posts: 30,995
Oregon
AndyF
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I Win
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Posts: 30,995
Oregon
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Quote:
I do have your book Andy and have read most of it. Very good read - congratulations. You seem to favor the 4.25 stroke (or so it seemed to me). Any particular reason other than cubes? I will look into some of the other kits but the 4.125 Mancini kit seems to be a very attractive price compared to what I have seen so far.
I did see an earlier post where you were talking about running HP manifolds on your 470. I thought you said you were trying the same on a 512. How did that turn out, did you use the .528 MP cam on that also?
Steve
My new low deck 512 motor does have HP manifolds but it has a small hyd roller camshaft rather than the .528 flat tappet. It made good power on the dyno but I haven't installed it in my car yet.
Yes, with a 440 block I'd recommend the 4.250 stroke crankshaft and Chevy rod journals with Chevy rods. 6.800 or 7.100 long rods should be fine. Either setup is very nice and the piston has plenty of room for a conservative ring stack.
If you shop only on price then you'll be getting the least expensive items on the market. That includes the rings, bearings, bolts, etc. That is fine if that is what you want but don't go that way if you're planning on making a bunch of power. Lots of ways to go, just make a plan and understand what you're doing and you'll be fine.
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Re: Which RB Stroker Kit?
[Re: srunge55]
#498669
10/16/09 09:34 PM
10/16/09 09:34 PM
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Joined: Jan 2003
Posts: 74,976
U.S.S.A.
JohnRR
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I Win
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Quote:
Oops, does a 6.760 rod sound right? I see Best Machine selling crate motors with this same rotating assembly.
440 source will knock off $150 w/o the balance job. So it would be $1747. Mancini's kit looks better to me at $1450. 440 source has a 4.15 stroke kit but it uses a Mopar Rod journal. I thought the BBC journal was the way to go these days.
That sounds better , but a longer rod would be better to make the piston package smaller and less rotating mass .
sounds like the eagle crank is using a mopar sized big end , the BBC big end provides more clearance .
As far as which is better , I'll spare the board from the abuse I'll get from the  ..
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Re: Which RB Stroker Kit?
[Re: JohnRR]
#498670
10/16/09 10:00 PM
10/16/09 10:00 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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whats the benifit of running a 4.250 crank, 7.1" rod on a street engine?
thats pin must be so far up the piston I can't see it lasting 5k on a street engine.
or am I wrong?
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Re: Which RB Stroker Kit?
#498671
10/16/09 11:26 PM
10/16/09 11:26 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
whats the benifit of running a 4.250 crank, 7.1" rod on a street engine?
thats pin must be so far up the piston I can't see it lasting 5k on a street engine.
or am I wrong?
The compression height with a 7.1 rod & a 4.25 stroke is still 1.48 Plenty of street motors are considerably shorter... Obviously the shorter piston is considerably lighter... AndyF does seem to favor the 6.8 rod combo...
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Re: Which RB Stroker Kit?
[Re: 1_WILD_RT]
#498673
10/17/09 01:01 AM
10/17/09 01:01 AM
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Joined: Jan 2003
Posts: 30,995
Oregon
AndyF
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I Win
Joined: Jan 2003
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Oregon
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Quote:
Quote:
whats the benifit of running a 4.250 crank, 7.1" rod on a street engine?
thats pin must be so far up the piston I can't see it lasting 5k on a street engine.
or am I wrong?
The compression height with a 7.1 rod & a 4.25 stroke is still 1.48 Plenty of street motors are considerably shorter... Obviously the shorter piston is considerably lighter... AndyF does seem to favor the 6.8 rod combo...
I went 6.800 long rods on the motor I built for the book becuase there were a lot more choices for pistons and rods then. But since then, some more vendors have come along with both pistons and rods so if I was building a motor today I'd probably take another look at it.
SCAT has cranks now that weren't available a year ago, K1 has cranks that I didn't know about when I wrote the book. Compstar has some new rods available, etc.
Even with the 7.10 long rods and the 4.250 stroke the piston is still tall enough to be very conservative. The rod ratio is good, the rod is long enough to keep the piston skirts up off the crankshaft counterweights, etc. All around a great combo. No reason a motor like that wouldn't go 100,000 miles if you built it like an OEM engine.
The slightly shorter 6.80 rod also works just fine. There are a few oddball rods out there such as 6.850 and 6.900 but you'll probably need semi-custom pistons if you run those.
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Re: Which RB Stroker Kit?
[Re: AndyF]
#498674
10/17/09 01:15 AM
10/17/09 01:15 AM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
I went 6.800 long rods on the motor I built for the book becuase there were a lot more choices for pistons and rods then. But since then, some more vendors have come along with both pistons and rods so if I was building a motor today I'd probably take another look at it.
SCAT has cranks now that weren't available a year ago, K1 has cranks that I didn't know about when I wrote the book. Compstar has some new rods available, etc.
Even with the 7.10 long rods and the 4.250 stroke the piston is still tall enough to be very conservative. The rod ratio is good, the rod is long enough to keep the piston skirts up off the crankshaft counterweights, etc. All around a great combo. No reason a motor like that wouldn't go 100,000 miles if you built it like an OEM engine.
The slightly shorter 6.80 rod also works just fine. There are a few oddball rods out there such as 6.850 and 6.900 but you'll probably need semi-custom pistons if you run those.
Glad to hear that.. I'm finishing up my 7.1 rod 505 & while I feel it's gonna be a reliable street combo it's always been in the back of my head that you choose to go with the 6.8 rod... I don't think the rod ratio differance is of much consequence & I know enough guys running shorter pistons that I felt it would be fine.. I felt trading piston height for rod length was gonna reduce the bobweight & in my mind it was a good trade-off...
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Re: Which RB Stroker Kit?
[Re: 1_WILD_RT]
#498675
10/17/09 05:47 AM
10/17/09 05:47 AM
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Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
minivan
master
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master
Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
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Quote:
Quote:
I went 6.800 long rods on the motor I built for the book becuase there were a lot more choices for pistons and rods then. But since then, some more vendors have come along with both pistons and rods so if I was building a motor today I'd probably take another look at it.
SCAT has cranks now that weren't available a year ago, K1 has cranks that I didn't know about when I wrote the book. Compstar has some new rods available, etc.
Even with the 7.10 long rods and the 4.250 stroke the piston is still tall enough to be very conservative. The rod ratio is good, the rod is long enough to keep the piston skirts up off the crankshaft counterweights, etc. All around a great combo. No reason a motor like that wouldn't go 100,000 miles if you built it like an OEM engine.
The slightly shorter 6.80 rod also works just fine. There are a few oddball rods out there such as 6.850 and 6.900 but you'll probably need semi-custom pistons if you run those.
Glad to hear that.. I'm finishing up my 7.1 rod 505 & while I feel it's gonna be a reliable street combo it's always been in the back of my head that you choose to go with the 6.8 rod... I don't think the rod ratio differance is of much consequence & I know enough guys running shorter pistons that I felt it would be fine.. I felt trading piston height for rod length was gonna reduce the bobweight & in my mind it was a good trade-off...
Going in your B body vert Randy??
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