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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546755
12/13/13 03:41 PM
12/13/13 03:41 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:
i'll have to check prices on the 2" big end chevy rods and what it costs to turn the rod jounals down to that size. should lighten it up some using those rods.
I have this combo now in my 360(Mine is the large chevy) my stuff is pretty damn light and you can get lighter I'm sure...... radiusing the sharp edges on the crank costs just a little time and makes the crank stronger....
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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546758
12/13/13 09:32 PM
12/13/13 09:32 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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If you have run 131, you should be going very low 10's, what are your 60 ft times ?
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: deaks]
#1546759
12/13/13 09:45 PM
12/13/13 09:45 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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Not true at all... it just depends on how the car is on the bottom end. My turbo car is an extreme case, but it's only been 10.08@136 (stock 360 block 1/2 fill, stock cast crank BTW.)
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Re: what can be done to a 360 for strength
[Re: pittsburghracer]
#1546760
12/14/13 12:10 AM
12/14/13 12:10 AM
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Joined: Mar 2008
Posts: 883
Affton MO
qwkmopardan
super stock
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super stock
Joined: Mar 2008
Posts: 883
Affton MO
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Quote:
All I want to know is how long does it take to put 1800+ passes on an engine. Wholly crap. 
If I raced that car full time, I also have the 89 LeBaron, it would only take a little over 4 seasons. That eng. was first used in 2007, and full time the first 2 years and then I got the LeBaron running.
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Re: what can be done to a 360 for strength
[Re: dizuster]
#1546762
12/14/13 12:40 AM
12/14/13 12:40 AM
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Joined: Mar 2008
Posts: 883
Affton MO
qwkmopardan
super stock
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super stock
Joined: Mar 2008
Posts: 883
Affton MO
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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.
The studs at full 1/2" dia. do not stretch enough at 100ft. lbs. of torque. The stock head bolts as well as the ARP head bolts have the dia. reduced to 7/16" from about 1/4" below the head to just above where the threads start, which allows for more stretch at 100ft.lbs. Main studs work great because there is nothing between the two surfaces being clamped, unlike between the block and the head. More stretch on a head bolt allows more load to stay on when the gasket further compresses form heat cycling. If you try torqueing more than 100 ft. lbs., to, say, 135 ft. lbs., which would further stretch the stud, you will more than likely pull the threads out of the block.
I had studs on a 360 years ago and it would blow head gaskets at 10.75 to CR. So one day I happened to notice how the dia. on the bolts was not full size, so I turned the ARP studs to 7/16" between the threads and never blew another head gasket on that eng. and I ran it for a couple more years until it broke the stock cast 360 crank into 3 pieces.
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Re: what can be done to a 360 for strength
[Re: pittsburghracer]
#1546768
12/14/13 04:01 AM
12/14/13 04:01 AM
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Joined: Jul 2012
Posts: 429
Washington
skrews
mopar
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mopar
Joined: Jul 2012
Posts: 429
Washington
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Quote:
I would get shot or hung for letting this one out of the bag but most of the involved party is dead and gone or about out of the game. A close Friend worked for one of the really big Ford teams and they were taught to flip a head over and chamfer the head bolt holes on the deck surface of the head. They found out that as the head was being torqued down it was pulling the head harder under the head bolts and distorting the head mating surface. Putting a chamfer on the head bolt hole spread the pressure evenly across the deck. 
The other part to this is to chamfer the head bolt holes in the block a bit.
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Re: what can be done to a 360 for strength
[Re: mopar dave]
#1546770
12/14/13 07:52 AM
12/14/13 07:52 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:
the Molnar H beam in a 6.250 length with standard Chevy pin weights 512g with 3/8 arp2000 bolts. can I use the 3/8 bolts in this combo or should I be using the 7/16 bolt. looks like the bigger bolt adds a lot of weight. pistons will be between 400-450G.
If you go to a Mopar spec piston, then you won't have to use that long rod....
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Re: what can be done to a 360 for strength
[Re: SSDart]
#1546771
12/14/13 11:19 AM
12/14/13 11:19 AM
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Joined: Jan 2003
Posts: 11,733
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,733
Portage,michigan
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Quote:
Quote:
the Molnar H beam in a 6.250 length with standard Chevy pin weights 512g with 3/8 arp2000 bolts. can I use the 3/8 bolts in this combo or should I be using the 7/16 bolt. looks like the bigger bolt adds a lot of weight. pistons will be between 400-450G.
If you go to a Mopar spec piston, then you won't have to use that long rod....
Lot of people like/ prefer the long rod with 4 inch crank. I used 6.300 Compstar rods which worked extremely well.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car
Best so far, 10.32 1/4
1.41 best 60 foot
6.56 at 104.17
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