engine build question
10-19-2009, 05:43 AM
#1
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engine build question
OK, so its very hard to get any mopar bits over here in the UK, or should i say expensive, so ive got this idea for a bit of a budget engine build....
Ive got the chance of a pair of 360 heads, now ive heard if you build these onto your 318 block it lets it all breathe a bit better and releases a few horses.
Anyone heard of this, any ideas?
Ive got the chance of a pair of 360 heads, now ive heard if you build these onto your 318 block it lets it all breathe a bit better and releases a few horses.
Anyone heard of this, any ideas?
10-19-2009, 10:54 AM
#2
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that is true because the valves are larger. You might even be able to get them enlarged some more and throw a decent size cam at it and pull some pretty good numbers.
10-19-2009, 11:04 PM
#4
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I dont want to throw a spanner into the works, and I'm new to mopars, but not hotrods, But I believe they flow better, but what about the chamber volume? Is it the same or would it drop or raise the compression ratio?
Last edited by scotts74birds; 10-19-2009 at 11:06 PM.
10-20-2009, 12:45 AM
#5
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good question, i may need to look into it some more, basically a guy over here who has a 318 fury 3 told me about the build with 360 heads, mainly this and a 4bbl carb and intake apparantly makes the 318 a bit more lively. I dont want huge numbers, just a bit more than stock, a free-er flow exhaust etc and i will be happy.
10-21-2009, 05:17 PM
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if you put 360 heads on a 318 the loss of compression will hurt performance more than the larger valves and runners will help. If the rest of the 318 is stock, i wouldn't put 360 heads on it. Milled heads will help, but new pistons with a better compression height is what would be needed to really make the combo work well.
10-21-2009, 07:16 PM
#9
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I think different year 318's had different compression so it would be best to work it out on paper first. 67 and 68 318's had more compression.
I personally ran a set of 360 heads on my 68 dodge pickup on the 318. It had the stock 2bbl 360 manifold and carb and a set of hedders. It ran real strong indeed. You could run the Keith Black 318 pistons to gain compression.
I personally ran a set of 360 heads on my 68 dodge pickup on the 318. It had the stock 2bbl 360 manifold and carb and a set of hedders. It ran real strong indeed. You could run the Keith Black 318 pistons to gain compression.
10-22-2009, 07:31 AM
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Thanks guys, much help all of this. Ive maybe changed my mind now though, im now thinking stroker kit.
Im told there are versions available that dont require machining of your block etc. Just bolt on and go sort of thing.
Just to clarify, i know my way round wrenches and sockets but have no experience with chrysler corp stuff thats all
Im told there are versions available that dont require machining of your block etc. Just bolt on and go sort of thing.
Just to clarify, i know my way round wrenches and sockets but have no experience with chrysler corp stuff thats all
10-22-2009, 03:45 PM
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instead of the milling expenses. just use a thinner head gasket, it does the same thing and you `ll need to put new ones on it anyway. itll boost the conp. a little, the 360 heads dont have as much quench area as the 318`s do, so youll gain some comp. that way also.
10-22-2009, 10:15 PM
#12
Mopar Fan
I'm in Germany and I feel your pain for getting parts over here. One thing to be careful of with the larger valves is you'll want to make sure they won't impact the top of the piston when they are open.
Last edited by crwchf16; 10-22-2009 at 10:19 PM. Reason: spelling
10-25-2009, 09:07 PM
#16
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Actually, the "J" heads were factory heads used on 360 engines.
They have a letter "J" cast into them in the area of the sparkplug location.
{there were heads that had an "O" cast into them also.} Mostly the "J" heads were associated with the 360 engine of the 70's. Some had the 2.02 intake valve but most were 1.88 intake sized. They replaced the "X" heads for the 340 in '73, {last year for the 340}. They pretty much had the same size ports as the X but usually had the smaller valve and were intended for lower rpm operation, thus the valvesprings were not up to par with the 340's in comparison. I am not actually sure but I believe they were made from '72 to about '79. They might have been used on the 318 for the 4 bbl equipped 318's in '79 {'78?}
I believe they would work good on a 318 as long as you could keep the compression above 9 to 1 (+/-). {8.5 to 1 at minimum}
They have a letter "J" cast into them in the area of the sparkplug location.
{there were heads that had an "O" cast into them also.} Mostly the "J" heads were associated with the 360 engine of the 70's. Some had the 2.02 intake valve but most were 1.88 intake sized. They replaced the "X" heads for the 340 in '73, {last year for the 340}. They pretty much had the same size ports as the X but usually had the smaller valve and were intended for lower rpm operation, thus the valvesprings were not up to par with the 340's in comparison. I am not actually sure but I believe they were made from '72 to about '79. They might have been used on the 318 for the 4 bbl equipped 318's in '79 {'78?}
I believe they would work good on a 318 as long as you could keep the compression above 9 to 1 (+/-). {8.5 to 1 at minimum}
10-26-2009, 04:03 AM
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Gotcha, thanks folks
I think im just gonna go for the route of better headers, intake and carb first. Im looking for an edelbrock performer intake and suitable carb (about 600cfm) i might lob in a fast road cam too.
But first, finish the body welding and restoration Which is going ok, replaced the rear frame rails over the weekend. Hmmm new metal.....
I think im just gonna go for the route of better headers, intake and carb first. Im looking for an edelbrock performer intake and suitable carb (about 600cfm) i might lob in a fast road cam too.
But first, finish the body welding and restoration
Which is going ok, replaced the rear frame rails over the weekend. Hmmm new metal.....
10-27-2009, 06:32 AM
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Actually, the "J" heads were factory heads used on 360 engines.
They have a letter "J" cast into them in the area of the sparkplug location.
{there were heads that had an "O" cast into them also.} Mostly the "J" heads were associated with the 360 engine of the 70's. Some had the 2.02 intake valve but most were 1.88 intake sized. They replaced the "X" heads for the 340 in '73, {last year for the 340}. They pretty much had the same size ports as the X but usually had the smaller valve and were intended for lower rpm operation, thus the valvesprings were not up to par with the 340's in comparison. I am not actually sure but I believe they were made from '72 to about '79. They might have been used on the 318 for the 4 bbl equipped 318's in '79 {'78?}
I believe they would work good on a 318 as long as you could keep the compression above 9 to 1 (+/-). {8.5 to 1 at minimum}
They have a letter "J" cast into them in the area of the sparkplug location.
{there were heads that had an "O" cast into them also.} Mostly the "J" heads were associated with the 360 engine of the 70's. Some had the 2.02 intake valve but most were 1.88 intake sized. They replaced the "X" heads for the 340 in '73, {last year for the 340}. They pretty much had the same size ports as the X but usually had the smaller valve and were intended for lower rpm operation, thus the valvesprings were not up to par with the 340's in comparison. I am not actually sure but I believe they were made from '72 to about '79. They might have been used on the 318 for the 4 bbl equipped 318's in '79 {'78?}
I believe they would work good on a 318 as long as you could keep the compression above 9 to 1 (+/-). {8.5 to 1 at minimum}
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