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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546716
12/12/13 11:55 AM
12/12/13 11:55 AM
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Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
BJS racing
top fuel
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top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
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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.
Back in the swing of things at Painless again! Great to be back!
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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546717
12/12/13 12:04 PM
12/12/13 12:04 PM
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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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Light pistons and a good balance job is about the best you can do... you would be taking a lot of the stress off of it 
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Re: what can be done to a 360 for strength
[Re: MR_P_BODY]
#1546718
12/12/13 12:35 PM
12/12/13 12:35 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546720
12/12/13 02:11 PM
12/12/13 02:11 PM
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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:
how lite are you talkin as for piston or rod weight? whats would be a good target bob weight? my current bob weight is 1901g.
My currant pistons are like 430G and the bob weight
is like 1500G.. they are CP pistons
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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546722
12/12/13 05:59 PM
12/12/13 05:59 PM
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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:
my CP's are 450g. what rod and what does it weight Mike?
I'm using chevy Eagle H-beams
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Re: what can be done to a 360 for strength
[Re: MR_P_BODY]
#1546723
12/12/13 06:24 PM
12/12/13 06:24 PM
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Joined: Jan 2007
Posts: 685
pennsylvania
poboyengineering
mopar
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mopar
Joined: Jan 2007
Posts: 685
pennsylvania
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ok, teach me something...IIRC, the strength of the 360 crank is in the overlap. doesn't going to the SBC rod take from that? or is there enough built in that it really doesn't matter?
It may be ugly, but it sure is slow.
Girls comb their hair in rear view mirrors and the boys try to look so hard....
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Re: what can be done to a 360 for strength
[Re: poboyengineering]
#1546726
12/12/13 06:40 PM
12/12/13 06:40 PM
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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:
ok, teach me something...IIRC, the strength of the 360 crank is in the overlap. doesn't going to the SBC rod take from that? or is there enough built in that it really doesn't matter?
My stuff is 340 based.. I never had any issues even
at 9600 rpm(I was looking for more power but it wasnt
up that high.. 8200 rpm was max)... my cam is all wrong)
time for a new cam... either regrind mine or use the
new blank
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Re: what can be done to a 360 for strength
[Re: poboyengineering]
#1546727
12/12/13 06:43 PM
12/12/13 06:43 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Hard to get heads that make enough power to hurt a 360 IMO Get those big crank journals oiled well and have fun--it will live just fine.
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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546728
12/12/13 06:43 PM
12/12/13 06:43 PM
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Joined: Dec 2006
Posts: 3,415
Pa
Hot 340
master
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master
Joined: Dec 2006
Posts: 3,415
Pa
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Quote:
is there anything that can be done to a 1971 360 block that would make it alittle stronger? the block has a short fill and uses arp main studs with stock caps. are there any girdles out there that work? what about aluminum main caps to absorb some stress? will be a 13.5:1 7000rpm street/strip deal. maybe 15 passes/yr for a couple years, than I will be moving on to big block.
I wouldnt touch it, just run it.. my opinion is a good tune is more important than anything else.
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Re: what can be done to a 360 for strength
[Re: Hot 340]
#1546729
12/12/13 06:46 PM
12/12/13 06:46 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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If your compression is that high it will pop a head gasket before anything else breaks--keep spares, use the FelPro 1008 or a Cometic and be prepared to change one side every now and then--use CLEAR hose on pan evacs, when you see vapor in the hose change that side and keep racing!
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Re: what can be done to a 360 for strength
[Re: ]
#1546730
12/12/13 07:02 PM
12/12/13 07:02 PM
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Joined: Apr 2009
Posts: 3,433
Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,433
Toronto
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I wouldn't waste my time with a girdle or even caps. I considered all those options for my build, and they all seemed like band aids to me that have no proof they even help. I settled on a half fill, and im using stock caps and bolts...Might change to main studs, but thats about all I would do. A girdle or caps imo aren't going to do much when it seems the problem area is elsewhere in the blocks. I would run it as is, especially if it only sees 15 passes a season and no street miles 
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Re: what can be done to a 360 for strength
[Re: MR_P_BODY]
#1546732
12/12/13 07:11 PM
12/12/13 07:11 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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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
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: MR_P_BODY]
#1546733
12/12/13 07:12 PM
12/12/13 07:12 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I hear you--I always ran 1/8th mile so we went TQ and cylinder pressure crazy advancing cams a mile and going for every ounce of grunt--ole car would wheez out in the 1/4 mile but would rip the seat bolts through the floor pan feel on the 1/8th --and keep me with an eye on those clear tubes I have always like your car P Body--good to watch a real racer!! 
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Re: what can be done to a 360 for strength
[Re: deaks]
#1546734
12/12/13 07:15 PM
12/12/13 07:15 PM
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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:
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 selling
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
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