472 crate hemi freshin up with results
#1774468
03/08/15 12:19 AM
03/08/15 12:19 AM
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Joined: Jan 2010
Posts: 311
Kingsville, Md
grncpe
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enthusiast
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OP
enthusiast
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Posts: 311
Kingsville, Md
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We have a street car 71 cuda also and let me start off with this was the biggest pig I have ever driven..lol We had nothing but problems with it leaking everywhere, smoking, & just no power so we pulled it out last year and this is what we found.Chrysler or whoever did this motor did not debur the block where the push rods come through, so it was eating the pushrods. I could move the springs around under the retainers, like literally,wrong retainers.The guide clearance was just about 50 thousandths.Also the camshaft eccentric for the fuel pump was going south. we started with torque plating and diamond honing the block added total seal rings good stone valve job correct retainers bronze guides Racer Brown 485 lift 238 dur. cam cometic head,intake,& valve cover gaskets we also changed out the crate rocker arms to original rockers So the long short of it is now no leaks & PLENTY of power for a street car. This has a stock 2x4 intake & stock 68 auto carbs on it. I never liked the crate motors, and this one has took the cake. I am very happy with it now! I even have video for you guys. sounds healthy idling and very responsive. Made 554hp & 598tq with 93 oct. pump gas with 32 total deg. of timing.... https://www.youtube.com/watch?v=bZuglFYC3x0
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Re: 472 crate hemi freshin up with results
[Re: MoparJunkie]
#1774471
03/08/15 09:42 AM
03/08/15 09:42 AM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
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I Win
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Quote:
Can you give some specifics...ie was this a Cummins crate,and when did you purchase this crate engine. That will help clear up some things. It really sounds like it was a Cummins crate with your particular issues???? 
Sounds like a Cummins crate motor to me and if that list is only what was done they didn't do enough. The reason the pushrods were hitting the block is because the lifter bore angles are off , at least they were on my crate hemi from 2005 , along with the heads needing everything , decks were about .015 taller than spec and the main line bores were tapered ...
An MP crate Hemi built by Cummins was an EXPENSIVE CORE.
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Re: 472 crate hemi freshin up with results
[Re: JohnRR]
#1774473
03/08/15 09:50 PM
03/08/15 09:50 PM
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Joined: Dec 2006
Posts: 3,395
Pa
Hot 340
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master
Joined: Dec 2006
Posts: 3,395
Pa
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Quote:
The reason the pushrods were hitting the block is because the lifter bore angles are off ,
How did you personally verify this?
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Re: 472 crate hemi freshin up with results
[Re: Hot 340]
#1774476
03/10/15 02:07 AM
03/10/15 02:07 AM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
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Quote:
Quote:
The reason the pushrods were hitting the block is because the lifter bore angles are off ,
How did you personally verify this?
I had the lifter bores bushed, the shop that did it told me the lifter angle was off which didn't surprise me considering how bad the rest of it was.
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Re: 472 crate hemi freshin up with results
[Re: WO23Coronet]
#1774477
03/10/15 02:11 AM
03/10/15 02:11 AM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
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I Win
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Quote:
Can anyone explain why Cummins screwed this up so badly? I mean they have a reputation of gold with their 5.9/6.7's, why could they not build a decent Hemi?
Because Chrysler had to find a new supplier after Arrow bailed.
Chrysler went with the LOW BIDDER and they got exactly what they paid for, low bidder quality.
I think Chrysler also hoped that most buyers took longer than the warranty period , which started when you bought it , before getting it running , basically a taillight warranty ...
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Re: 472 crate hemi freshin up with results
[Re: grncpe]
#1774478
03/10/15 02:13 AM
03/10/15 02:13 AM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
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I Win
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Quote:
The motor was from right around 1999 2000. The decks were a bit off but we parallel decked it also.I felt like I was writing a novel so I didn't go through every detail. The just didn't debur the holes for the pushrods. I guess im lucky a lot of the other issues didn't come up. I did have to take the heads back off on the dyno, the pass head was leaking oil at the top right corner where it is rounded under the dist. Steel head gaskets, took that side of and measured, 25 thous on the bottom of the gasket, 35 thous at the top. I torqued the head again before pulling it off and still leaked.The oil was running around the tab that goes up near the intake on the deck. I was done at that point and went ahead & put cometic 27 thous. gaskets on it. Problem solved. I have never had good luck with steel head gaskets sealing on hemis. They were even original Direct Conection gaskets.
Has anyone else ran into this before?
I thought Arrow was still doing them then ?
Good to know on the steel shim head gasket , that is what I was going to use 
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Re: 472 crate hemi freshin up with results
[Re: JohnRR]
#1774479
03/10/15 09:59 AM
03/10/15 09:59 AM
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Joined: Sep 2006
Posts: 1,131
Home of the Bluegrass
MoparJunkie
super stock
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super stock
Joined: Sep 2006
Posts: 1,131
Home of the Bluegrass
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On a very interesting note... Gary Stanton informed me Arrow has recently been tabbed to produce the new cast iron Mopar Hemi blocks. Although nothing has come available yet, according to him. We were talking about the subject when I picked up my Hemi from his shop about a month ago.
"It takes a Mopar to catch a Mopar”
1971 Roadrunner FJ6 Sassy Grass 505"RB, 18 spline 4 speed, and Dana 60 with 3.54
2022 Hellcat Charger Widebody Redeye Jailbreak: Hellraisin with 8 speed auto
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Re: 472 crate hemi freshin up with results
[Re: dogdays]
#1774481
03/12/15 07:52 PM
03/12/15 07:52 PM
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Joined: Jan 2010
Posts: 311
Kingsville, Md
grncpe
OP
enthusiast
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OP
enthusiast
Joined: Jan 2010
Posts: 311
Kingsville, Md
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Quote:
The "good power with tiny camshaft" remark points out the fact that really good heads don't need a lot of camshaft to make power.
The rumors about who is maybe producing new blocks has me humming REO Speedwagon's "Take It On the Run", namely "heard it from a friend, who heard it from a friend who heard it from another..."
R. [/quote
]
Less seems to be more on the street hemi's from the couple I have done.Most importantly is the timing on them.Remember they are not big block cheverolet's . I have dynoed a few and they don't need a lot of timing.They don't have a quench area like a wedge so they are not forgiving.
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Re: 472 crate hemi freshin up with results
[Re: grncpe]
#1774482
03/12/15 08:24 PM
03/12/15 08:24 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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Joined: Jul 2006
Posts: 4,179
California
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Quote:
Less seems to be more on the street hemi's from the couple I have done.Most importantly is the timing on them.Remember they are not big block cheverolet's . I have dynoed a few and they don't need a lot of timing.They don't have a quench area like a wedge so they are not forgiving.
it's small, but mine was making 6 more HP/100RPM at 32 than at 34 on the dyno.
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