cheap mild 360 build
#1736638
01/23/15 12:26 AM
01/23/15 12:26 AM
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Joined: Jul 2005
Posts: 1,044
minnesota
president61
OP
super stock
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OP
super stock
Joined: Jul 2005
Posts: 1,044
minnesota
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heres what I have:
1978 police 360 block, re-ringed with standard bore(very little wear in cylinders), stock bottom end, windage tray
I'm going to have the block square decked and honed, that is it.
factory 72 340 cast intake with 73 thermoquad carb
factory cast manifolds(C-body drivers side manifold) with 2.25" exhaust
factory re-curved distributor.
I'm not buying new pistons. I want the car to run on 87 or 89 octane fuel
its going in a 76 dart swinger with a O500 overdrive trans and 3.23 gears
I have a set of J heads I'm going to get reconditioned. now the questions:
what camshaft? what should I have done to the heads? moly rings or regular. Any help suggestions would be greatly appreciated
ps I would like to get 300 horsepower
Last edited by president61; 01/23/15 12:33 AM.
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Re: cheap mild 360 build
[Re: president61]
#1736639
01/23/15 12:58 AM
01/23/15 12:58 AM
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Joined: Feb 2005
Posts: 20,174
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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30 plus years ago I put a stock bore stock piston 340 together for him. We used a set of 2.02 valve heads that I polished up, a 484 lift purple shaft cam, and a ld340 intake. We used a 727 trans and a 3800 stall conv. Put it in a 72 duster with 4.10 gears and it ran 12.40 his first time at the track. Not very hard to get 300 hp
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: cheap mild 360 build
[Re: president61]
#1736640
01/23/15 01:02 AM
01/23/15 01:02 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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Have the bowls cleaned up on the heads, valve job and put the 340 cam in it with the right springs.. not the stock 340 springs 
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Re: cheap mild 360 build
[Re: president61]
#1736641
01/23/15 02:06 AM
01/23/15 02:06 AM
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Joined: Jan 2003
Posts: 864
St Paul MN
73swinger
super stock
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super stock
Joined: Jan 2003
Posts: 864
St Paul MN
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I think I would go with the magnum heads that take LA intake.
Enginequest maybe??
Chris Schwartz
73 Swinger 340 12.451 @ 108.78
73 Gold Duster, needs a plan.
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Re: cheap mild 360 build
[Re: MR_P_BODY]
#1736642
01/23/15 02:16 AM
01/23/15 02:16 AM
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Joined: Jul 2005
Posts: 1,044
minnesota
president61
OP
super stock
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OP
super stock
Joined: Jul 2005
Posts: 1,044
minnesota
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Quote:
Have the bowls cleaned up on the heads, valve job
and put the 340 cam in it with the right springs..
not the stock 340 springs
Any special valve job? Is it a stock mopAr cam?
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Re: cheap mild 360 build
[Re: president61]
#1736643
01/23/15 02:25 AM
01/23/15 02:25 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:
Have the bowls cleaned up on the heads, valve job
and put the 340 cam in it with the right springs..
not the stock 340 springs
Any special valve job? Is it a stock mopAr cam?
For what your doing a 3 angle will work... a 5 angle
will get a bit better power... on the cam.. I remember
.444 lift... if you want to go after market you
can go a bit more but keep the duration down so it makes
some cyl pressure
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Re: cheap mild 360 build
[Re: president61]
#1736644
01/23/15 03:11 AM
01/23/15 03:11 AM
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Joined: Jan 2003
Posts: 9,997
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,997
Frostbitefalls MN (Rocky&Bullw...
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I agree with the short duration cam choice. With 3.23 gears and low compression, no more duration than a stock 340 cam will work well. If there is a cam with similar duration but more lift, I would look into that. If you can back cut the stock valves, that will help. Many years ago I did that with a drill press to spin the valve, and an angle grinder. Ugly, but it worked. A 340 with low compression and a 268H Comp cam ran very well done that way. Be sure and run the thinnest head gaskets you can get, and block off the heat riser crossover if you can live with a bit of a cold blooded motor.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: cheap mild 360 build
[Re: president61]
#1736645
01/23/15 12:26 PM
01/23/15 12:26 PM
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Joined: Feb 2003
Posts: 1,942
Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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Had a similar combo in my dart:
- low CR 360 smog motor (~7.8:1 when I pulled it apart)
- Smog heads, 1.88/1.60 valves, no port work.
- Cast iron 340 manifold/600 holley
- Summit .441/.441 with 218/228 @ 0.050
- Hooker 1 5/8 headers
- 999 trans with stock lock-up converter
- 3.23's
Ran best on 87, and ran 14.0's, but I forget the MPH. Real street friendly motor. This was a year round daily driver through the Northeast snow...
Spun a bearing in that and through together another 360:
- H116cp slugs
- XE268H cam
- ported J heads
- LD340, 750 holley
ran consistent 12.80's at 107, but a bit less bottom end.
Headers would help for sure. Like Greg said, thin head gasket, block the heat crossover.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts
66 Belv. II - just a streetcar
88 Mustang - turbo LS beater
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Re: cheap mild 360 build
[Re: 73swinger]
#1736648
01/23/15 04:27 PM
01/23/15 04:27 PM
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Joined: Jan 2008
Posts: 2,233
ILLINOIS
volaredon
top fuel
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top fuel
Joined: Jan 2008
Posts: 2,233
ILLINOIS
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Quote:
I think I would go with the magnum heads that take LA intake.
Enginequest maybe??
I am doing just that on a 360 that I have going together right now.
I did a 318 a few years ago, realy woke that one up too.
on your build; "police" block no different from any other 360 block.
You say "very little" wear; it dont take much out of round or taper to have a rebuild that doesnt last long, sorry to say.
and there are pistons that can be bought that will still bump the compression ratio but will also still run pump gas and they are cheap.
Just got a set of Speed Pro 9:1 hypereutectic coated ones from a place called Falcon Global via Ebay, $134 shipped, WITH moly rings included! Only took 2 days to get here. they have STD 0.020, 0.030, and 0.040 that I saw in seperate auctions.
They sit 0.060" closer to the deck (difference in compression height vs stock pistons) and have 4 valve reliefs.
But if you get a good motor from it as you are going, you have betetr luck than me. If I don't do it all up 100% (machine work, hot tank, etc) I find myself not satisfied with the outcome.
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Re: cheap mild 360 build
[Re: volaredon]
#1736649
01/23/15 05:24 PM
01/23/15 05:24 PM
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Joined: Jul 2005
Posts: 1,044
minnesota
president61
OP
super stock
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OP
super stock
Joined: Jul 2005
Posts: 1,044
minnesota
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Quote:
Quote:
I think I would go with the magnum heads that take LA intake.
Enginequest maybe??
I am doing just that on a 360 that I have going together right now.
I did a 318 a few years ago, realy woke that one up too.
on your build; "police" block no different from any other 360 block.
You say "very little" wear; it dont take much out of round or taper to have a rebuild that doesnt last long, sorry to say.
and there are pistons that can be bought that will still bump the compression ratio but will also still run pump gas and they are cheap.
Just got a set of Speed Pro 9:1 hypereutectic coated ones from a place called Falcon Global via Ebay, $134 shipped, WITH moly rings included! Only took 2 days to get here. they have STD 0.020, 0.030, and 0.040 that I saw in seperate auctions.
They sit 0.060" closer to the deck (difference in compression height vs stock pistons) and have 4 valve reliefs.
But if you get a good motor from it as you are going, you have betetr luck than me. If I don't do it all up 100% (machine work, hot tank, etc) I find myself not satisfied with the outcome.
a reason I decided to just re-ring the motor other than cost is the fact that I had my 383 re-ringed 20 years ago and it still runs great. it leaks more oil than it burns and gets good milage. although the pistons are cheap, i would have to core it get the rods pressed off and back on.
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Re: cheap mild 360 build
[Re: volaredon]
#1736651
01/25/15 11:40 PM
01/25/15 11:40 PM
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Joined: Jul 2005
Posts: 1,044
minnesota
president61
OP
super stock
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OP
super stock
Joined: Jul 2005
Posts: 1,044
minnesota
|
Quote:
Quote:
I think I would go with the magnum heads that take LA intake.
Enginequest maybe??
I am doing just that on a 360 that I have going together right now.
I did a 318 a few years ago, realy woke that one up too.
on your build; "police" block no different from any other 360 block.
You say "very little" wear; it dont take much out of round or taper to have a rebuild that doesnt last long, sorry to say.
and there are pistons that can be bought that will still bump the compression ratio but will also still run pump gas and they are cheap.
Just got a set of Speed Pro 9:1 hypereutectic coated ones from a place called Falcon Global via Ebay, $134 shipped, WITH moly rings included! Only took 2 days to get here. they have STD 0.020, 0.030, and 0.040 that I saw in seperate auctions.
They sit 0.060" closer to the deck (difference in compression height vs stock pistons) and have 4 valve reliefs.
But if you get a good motor from it as you are going, you have betetr luck than me. If I don't do it all up 100% (machine work, hot tank, etc) I find myself not satisfied with the outcome.
i think i'm going to look into getting these pistons
Last edited by president61; 01/25/15 11:41 PM.
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