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Re: what can be done to a 360 for strength
[Re: BJS racing]
#1546735
12/13/13 01:08 AM
12/13/13 01:08 AM
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Joined: Mar 2006
Posts: 9,894
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,894
MI, usa
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Quote:
The biggest problem with the small block mopars are the main webs between the cam and the crank. They are not strong enough to support much over 600 - 650 HP. you will find people out there that have made more power than that and had no problems and some that haven't even made that much and had big problems. Main cap walk and the block its self are the biggest issues. A good main cap system (pro-grams) or something similar with studs and a good balance job are highly suggested.
I'm surprised at your findings. I've seen these problems with B/B but never a small block. I've never seen a small block pull a main web out like a B/B? Any pics? Split cylinder wall possibly.
We've run boosted ones for years with no failures, Yet.
Doug
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Re: what can be done to a 360 for strength
[Re: dvw]
#1546736
12/13/13 01:21 AM
12/13/13 01:21 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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All I have done is split cyl walls... I have blown one up due to ripping a Viper rod in half.. they arent as strong as they said LOL.... never had any cap walk 
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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546740
12/13/13 03:31 AM
12/13/13 03:31 AM
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Joined: Sep 2013
Posts: 168
Moparts
SSDart
member
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member
Joined: Sep 2013
Posts: 168
Moparts
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Quote:
what size jounal would you recommend and how is smaller safer?
Taking the journals down to 2" and using a chevy end connecting rod would be ideal..... the smaller journal has less surface speed plus think you can grind the crank with a generous radius making it much stronger again........... cost effective?? I'm not sure...
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Re: what can be done to a 360 for strength
[Re: MR_P_BODY]
#1546741
12/13/13 03:33 AM
12/13/13 03:33 AM
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Joined: Apr 2007
Posts: 1,390
CA.
RAY1969CARS
pro stock
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pro stock
Joined: Apr 2007
Posts: 1,390
CA.
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Quote:
Quote:
You seem to have good package there, sounds very angry. I'm suprised it's not a little quicker. What does the car weigh ? and did that enormous carb pick the car's Performance up ? What is your pb ?
Mick
My cam is all wrong... it should be a FAIR bit quicker
but thats gonna be for someone else since I'm sellingg
the car... I cant get a NHRA license any more...
its been 8.96.... should be closer to 8.60 and the
new cam should do it
why can't you get a NHRA license anymore
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Re: what can be done to a 360 for strength
[Re: RAY1969CARS]
#1546743
12/13/13 11:41 AM
12/13/13 11:41 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
You seem to have good package there, sounds very angry. I'm suprised it's not a little quicker. What does the car weigh ? and did that enormous carb pick the car's Performance up ? What is your pb ?
Mick
My cam is all wrong... it should be a FAIR bit quicker
but thats gonna be for someone else since I'm sellingg
the car... I cant get a NHRA license any more...
its been 8.96.... should be closer to 8.60 and the
new cam should do it
why can't you get a NHRA license anymore
Health reasons
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Re: what can be done to a 360 for strength
[Re: MR_P_BODY]
#1546744
12/13/13 11:50 AM
12/13/13 11:50 AM
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Joined: Apr 2007
Posts: 1,390
CA.
RAY1969CARS
pro stock
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pro stock
Joined: Apr 2007
Posts: 1,390
CA.
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Quote:
Quote:
Quote:
Quote:
You seem to have good package there, sounds very angry. I'm suprised it's not a little quicker. What does the car weigh ? and did that enormous carb pick the car's Performance up ? What is your pb ?
Mick
My cam is all wrong... it should be a FAIR bit quicker
but thats gonna be for someone else since I'm sellingg
the car... I cant get a NHRA license any more...
its been 8.96.... should be closer to 8.60 and the
new cam should do it
why can't you get a NHRA license anymore
Health reasons im so sorry bro !
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Re: what can be done to a 360 for strength
[Re: TheOtherDodge]
#1546746
12/13/13 01:43 PM
12/13/13 01:43 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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No offence Mike but my comments were meant for the OP. Lol
Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: what can be done to a 360 for strength
[Re: qwkmopardan]
#1546750
12/13/13 03:04 PM
12/13/13 03:04 PM
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Joined: Jan 2005
Posts: 3,635
Oakland, MI
dizuster
master
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master
Joined: Jan 2005
Posts: 3,635
Oakland, MI
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Quote:
Use ARP or stock head bolts. Use head studs and you will blow head gaskets.
I'd like to hear some logic behind that one. It flies in the face of common top engine builders best practices throughout the country.
Also, in my opinion a lot of the reason yours has lasted a long time is the fact that it's only got 28 degree's of timing in it.
Cylinder pressure early in the cycle puts an enormus stress on parts (and worse yet if it's detonating.) Remember if it's got a lot of cylinder pressure at TDC (or near it), it's trying harder to push the crank out the bottom of the block then it is trying to turn it!
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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546752
12/13/13 03:16 PM
12/13/13 03:16 PM
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Joined: Sep 2013
Posts: 168
Moparts
SSDart
member
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member
Joined: Sep 2013
Posts: 168
Moparts
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Quote:
haven't heard that before. I thought head studs created a better clamping force to help prevent head gasket blow out? i'm currently using the ARP head bolts. guess I could reuse these and save alittle.
I have not seen this on a Mopar, but on a small block ford the studs will pull up the surface locally around the stud... went through this with a 302 once. The cure is a MLS gasket.......
I looked up 2 inch pin rods....... lot's available in the chevy listings..... but they are .927 pin.. not the cheapest route but more reliable........
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Re: what can be done to a 360 for strength
[Re: dizuster]
#1546753
12/13/13 03:19 PM
12/13/13 03:19 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Quote:
Quote:
Use ARP or stock head bolts. Use head studs and you will blow head gaskets.
I'd like to hear some logic behind that one. It flies in the face of common top engine builders best practices throughout the country.
Also, in my opinion a lot of the reason yours has lasted a long time is the fact that it's only got 28 degree's of timing in it.
Cylinder pressure early in the cycle puts an enormus stress on parts (and worse yet if it's detonating.) Remember if it's got a lot of cylinder pressure at TDC (or near it), it's trying harder to push the crank out the bottom of the block then it is trying to turn it!
bback when I was running the old 366 I would blow a head gasket once in a while using stock head bolts,switched over to ARP head bolts and problem went away, my opinion is the stock head bolts are too soft and will stretch too much under pressure, my opinion is use a good quality ARP head bolt at the very least on a cast iron head and head stud's on aluminim heads.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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