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what can be done to a 360 for strength #1546715
12/12/13 12:49 PM
12/12/13 12:49 PM
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Mt Morris Michigan
mopar dave Offline OP
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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.

Re: what can be done to a 360 for strength [Re: mopar dave] #1546716
12/12/13 12:55 PM
12/12/13 12:55 PM
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Posts: 2,224
Arlington, Tx.
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BJS racing Offline
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Arlington, Tx.
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!
Re: what can be done to a 360 for strength [Re: mopar dave] #1546717
12/12/13 01:04 PM
12/12/13 01:04 PM
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Romeo MI
MR_P_BODY Offline
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Romeo MI
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

Re: what can be done to a 360 for strength [Re: MR_P_BODY] #1546718
12/12/13 01:35 PM
12/12/13 01:35 PM
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dogdays Offline
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BCR?

R.

Re: what can be done to a 360 for strength [Re: MR_P_BODY] #1546719
12/12/13 02:08 PM
12/12/13 02:08 PM
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Mt Morris Michigan
mopar dave Offline OP
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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.

Re: what can be done to a 360 for strength [Re: mopar dave] #1546720
12/12/13 03:11 PM
12/12/13 03:11 PM
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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

Re: what can be done to a 360 for strength [Re: MR_P_BODY] #1546721
12/12/13 03:32 PM
12/12/13 03:32 PM
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Mt Morris Michigan
mopar dave Offline OP
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my CP's are 450g. what rod and what does it weight Mike?

Re: what can be done to a 360 for strength [Re: mopar dave] #1546722
12/12/13 06:59 PM
12/12/13 06:59 PM
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Romeo MI
MR_P_BODY Offline
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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

Re: what can be done to a 360 for strength [Re: MR_P_BODY] #1546723
12/12/13 07:24 PM
12/12/13 07:24 PM
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Posts: 685
pennsylvania
poboyengineering Offline
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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....
Re: what can be done to a 360 for strength [Re: poboyengineering] #1546724
12/12/13 07:32 PM
12/12/13 07:32 PM
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dogdays Offline
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Mopar 360 rod journal - 2.123"
Chevy 350 rod journal - 2.100"

Not a whole lot of difference, but yes, it does reduce strength in a miniscule way.

NASCAR engines are running 1.850" rod journals at 9500 rpm. See the new issue of Circle Track.

R.

Re: what can be done to a 360 for strength [Re: dogdays] #1546725
12/12/13 07:37 PM
12/12/13 07:37 PM
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pennsylvania
poboyengineering Offline
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ok..i was thinking they were 2"...back to


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....
Re: what can be done to a 360 for strength [Re: poboyengineering] #1546726
12/12/13 07:40 PM
12/12/13 07:40 PM
Joined: Jun 2003
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Romeo MI
MR_P_BODY Offline
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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

Re: what can be done to a 360 for strength [Re: poboyengineering] #1546727
12/12/13 07:43 PM
12/12/13 07:43 PM

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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.

Re: what can be done to a 360 for strength [Re: mopar dave] #1546728
12/12/13 07:43 PM
12/12/13 07:43 PM
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Hot 340 Offline
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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.

Re: what can be done to a 360 for strength [Re: Hot 340] #1546729
12/12/13 07:46 PM
12/12/13 07:46 PM

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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!

Re: what can be done to a 360 for strength [Re: ] #1546730
12/12/13 08:02 PM
12/12/13 08:02 PM
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Toronto
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mshred Offline
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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

Re: what can be done to a 360 for strength [Re: ] #1546731
12/12/13 08:06 PM
12/12/13 08:06 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

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!




Cam shaft makes ALL THE DIFFERENCE on the cyl pressure
and what the head gasket will take.... I still run
the Felpro at 14.1:1 but it has a late valve closing
point so the pressure is low but works nice in the
high revs
EDIT
Understand that this is on a R-3 block so I have 2
extra studs to help clamp the head

Last edited by MR_P_BODY; 12/12/13 08:11 PM.
Re: what can be done to a 360 for strength [Re: MR_P_BODY] #1546732
12/12/13 08:11 PM
12/12/13 08:11 PM
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Posts: 3,210
robin hood country
deaks Offline
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robin hood country
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
Re: what can be done to a 360 for strength [Re: MR_P_BODY] #1546733
12/12/13 08:12 PM
12/12/13 08:12 PM

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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!!

Re: what can be done to a 360 for strength [Re: deaks] #1546734
12/12/13 08:15 PM
12/12/13 08:15 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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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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