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basic360 buildup
#1726676
01/10/15 10:46 PM
01/10/15 10:46 PM
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Joined: Jan 2008
Posts: 2,228
ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,228
ILLINOIS
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This engine is going into my son's 89 Ramcharger when done, the truck's TBI is going into the garbage with the computer, truck will have a carb (probably one of the 2, DemonSizzler prepped TQ's I have in the attic)
3 season driver, tow vehicle, best MPG I can get "for what it is" (a 4WD "brick")
I have a '76 360 in the machine shop now. (I tried talking the kid into a carb'd magnum 360 but he bought this motor 1st)
Looking at basically a stock 0.030" overbore rebuild on the short block. Crank fine, polished up "STD". "clean up" cut on the deck if needed.
I'm putting brand new EQ Magnum heads onto this LA block. already have the heads. stock-for Magnum sized valves (not 2.02's) Bought the 318-B (LA bolt pattern) heads direct from EQ, got the fully assembled ones.
Cam; I am looking at a COMP 260H with their nitride treatment.
Pistons will be Perfect Circle, Badger etc stock replacement style.
Intake; Edebrock, not sure if we will go with a "standard" performer or an RPM... I don't remember which one of these will allow use of the factory A/C (alum. compressor)
Not wanting to replace torque converter (trans is fresh as is converter
Will break in on manifolds, but will get headers shortly after.
sound like a pretty decently matched system? I have built a few motors over the years, most pretty much "stock"
this is my son's 1st engine build I am helping him through it and showing him some of the "tricks" I have learned since then, while we are at it w/o some of the past mistakes that I have made.
I have done 1 other mag head swap/ that, on a 83 318 in a 3/4 ton pickup, that one got a stock 360-2 cam put into it at that time,(same specs as a COMP 252 at 1/2 the price) on an unrebuilt 120K mile short block, and that combo really woke that engine up to a point of some people thinking I was lying about it being "only" a 318.
A COMP 260 has a lift of 0.440" I/E with stock 1.5 rockers and .460-something with the magnum 1.6s. I want increased torque and HP but do not want to worry about piston to valve interference.
Is there a similar spec'd cam (can be a different brand) to the 260H that will accomplish what we are after?
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Re: basic360 buildup
[Re: aspenrt360]
#1726688
01/14/15 09:32 PM
01/14/15 09:32 PM
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Joined: Jan 2008
Posts: 2,228
ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,228
ILLINOIS
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Quote:
just got a set of the 116 cp pistons in yesterday really good bang for the buck. not an al out race piston by any means but a good economy piston that puts compression into a 360, the main thing they are missing. I just weigh one they are so close to the stock piston weight you can just go ahead and run them. 
thanks for the replies guys.
So what CR would the 116s have with EQ's "Magnum" heads? (62 or 63cc chambers) We will go with either Victor or Fel Pro "stock Replacement" Magnum engine head gaskets.
One other concept that has been getting alot of press all over is "quench" I guess more quench means more CR before better fuel is needed to prevent detonation. but I don't quite "get" how you get the quench and exactly what it is.
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Re: basic360 buildup
[Re: volaredon]
#1726690
01/15/15 02:50 PM
01/15/15 02:50 PM
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Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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Quote:
Quote:
just got a set of the 116 cp pistons in yesterday really good bang for the buck. not an al out race piston by any means but a good economy piston that puts compression into a 360, the main thing they are missing. I just weigh one they are so close to the stock piston weight you can just go ahead and run them.
thanks for the replies guys.
So what CR would the 116s have with EQ's "Magnum" heads? (62 or 63cc chambers) We will go with either Victor or Fel Pro "stock Replacement" Magnum engine head gaskets.
One other concept that has been getting alot of press all over is "quench" I guess more quench means more CR before better fuel is needed to prevent detonation. but I don't quite "get" how you get the quench and exactly what it is.
Depends on your deck height. That piston at "0" deck, with a .041 gasket and 63cc chamber calculates to 10.7:1
.050 in hole, calculates to 9.5:1
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Re: basic360 buildup
[Re: volaredon]
#1726691
01/15/15 02:57 PM
01/15/15 02:57 PM
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Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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Quote:
also (I think it was them) Perfect Circle used to make a cast flat top (no dish) for a 360. I am wanting to see if they still do.
Why are 360's all equipped with dished pistons where 318s aren't? They handicapped the 360 right from the factory, I wouldnt understand why theyd want that either. (though I know most 318s are "in the hole" a bit too)
Yes, you can still get replacement, dished pistons for the 360 through any auto parts house.
Here's another option that's C H E A P. They're an ugly pistons but have proven to be rock solid relaibale in a build such as yours. I even know of one set in a motor that's gone high 11's now for going 4 years. I know of another set in a pulling truck AND had 40K+ street miles on it. Motor came down last year for a freshen...pistons/rings were A-Okay!
http://www.summitracing.com/parts/slp-h405cp30/overview/make/chrysler
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Re: basic360 buildup
[Re: cudadoug]
#1726693
01/15/15 10:08 PM
01/15/15 10:08 PM
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Joined: Jan 2008
Posts: 2,228
ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,228
ILLINOIS
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Quote:
Quote:
also (I think it was them) Perfect Circle used to make a cast flat top (no dish) for a 360. I am wanting to see if they still do.
Why are 360's all equipped with dished pistons where 318s aren't? They handicapped the 360 right from the factory, I wouldnt understand why theyd want that either. (though I know most 318s are "in the hole" a bit too)
Yes, you can still get replacement, dished pistons for the 360 through any auto parts house.
Here's another option that's C H E A P. They're an ugly pistons but have proven to be rock solid relaibale in a build such as yours. I even know of one set in a motor that's gone high 11's now for going 4 years. I know of another set in a pulling truck AND had 40K+ street miles on it. Motor came down last year for a freshen...pistons/rings were A-Okay!
http://www.summitracing.com/parts/slp-h405cp30/overview/make/chrysler
Yeah I know OEM style stock "dished" pistons are available everywhere "a dime a dozen", in the post where I asked that I was looking for a cast flat top (NOT dished)
Those ones you link to at summit are the ones I am looking into getting. Would I need a balance job to go with them vs the stock typed dished POS'?
Already have the Magnum heads on hand they are a definite to go onto this engine, looking for around 9:1 to 9-1/4 to 1 probably at most.
Definitely wanting a boost from the OEM sub-8:1
NOT wanting "cheap" for the sake of cheap nor bragging rights for "most expensive" 360 towing/4X4 motor but bottom line is BANG FOR THE BUCK...
Block at machine shop it has not yet bored as of 2 days ago/ was told to hold off on buying to be sure it'll clean up there; I wanted only 0.020 over but machinists claim 0.020 "harder to find" and pretty much insist on going 030 if any at all... so I have been shopping 30-over
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Re: basic360 buildup
[Re: volaredon]
#1726694
01/15/15 10:45 PM
01/15/15 10:45 PM
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Joined: Oct 2009
Posts: 1,267
North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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I am pretty sure the 380 hp 360 magnum crate motor is 9-9.5 comp. I do not know what brand they are but you could look into that.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: basic360 buildup
[Re: D-50]
#1726695
01/15/15 11:56 PM
01/15/15 11:56 PM
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Joined: Jan 2008
Posts: 2,228
ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,228
ILLINOIS
|
Quote:
I am pretty sure the 380 hp 360 magnum crate motor is 9-9.5 comp. I do not know what brand they are but you could look into that.
that's exactly where I'd like this motor to wind up when all is said and done. no more though due to not wanting to be stuck running Premium.
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