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Old 09-22-2004, 03:38   #1 (permalink)
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To build with JMM or not ?????

okay guys and girls,

i'm currently building a new engine for my ed this is what i am doing so far, balanced bottom end 40 thou oversized ACL Race series pistons, decking the block and not changing the rods as the stock units are more than up to the task, now from there up i'm at a loss as to what i should do with the head i will be running a custom inlet manifold with twin throttle bodies, and having a 6,400cc plenum and 666.66cc runners, and i'm unsure as to what head i should run should i go with a jim mock motorsport head or should i get a well know engineering place to just machine the head up with bigger valves, port and polish job and match it to the inlet manifold,

any help on this would be welcomed with open arms, as i'm unsure as to the benifits of the expensive JMM products over the other machine shops with good names.
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Old 09-22-2004, 03:42   #2 (permalink)
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Re: To build with JMM or not ?????

??? why are u changing the manifold???.... i hacnt had any thing to do with jmm, so im not going to say no... ive never heard any BAD reports from people that have gone jmm. at the end of the day, do you want youre 4.0 head to be the 1st 4.0 head some one ports or have it ported by some one who has done it 1000's of times, . jmm are not the only people who do 4.0 heads , but at least they do them.. if that makes sense. its very easy to port a head and even though it looks good, it may actually perform worse. id rather leave a head stock then have some one use it as a test porting head..
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Old 09-22-2004, 03:49   #3 (permalink)
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Re: To build with JMM or not ?????

how much are these heads and what has been done to them ?
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Old 09-22-2004, 03:59   #4 (permalink)
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Re: To build with JMM or not ?????

i am changing the inlet manifold as i believe there is a bit more power to gain there and it's not really a complex issue, and won't cost much at all if it doesn't work then i still have a stock ED manifold to throw on ( have done heaps of investigating into the inlet manifold and seems to be a positive thing in most eyes)

okay the website says
Vernier adjustable Timing Gear. Head reconditioning, extensive porting and head alterations to race standard, compression increase and Special valve springs.

i haven't contacted jmm for an exact price for just the head and cam yet but was looking at the DEV5a kit head

http://www.jimmockmotorsport.com
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Old 09-22-2004, 04:03   #5 (permalink)
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Re: To build with JMM or not ?????

JimMock rox!!!Their extractors and cams are fabulous!!!Just dont do it yourself...let them do it ..lok what happened to me, i screwed it eheh ps was putting out 150 rwkw with just exhaust and cam
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Old 09-22-2004, 04:13   #6 (permalink)
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Re: To build with JMM or not ?????

well alot of it won't be able to be done by them as i'm not sending the car from brisbane to victoria, too expensive.
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Old 09-22-2004, 14:07   #7 (permalink)
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Re: To build with JMM or not ?????

In brisbane go and see Gilberts on the gold coast to get a decent head job on a ford. You could also see surecam for a cam up there too but I would go the DEv5 cam as its easy to mail order that but get Gilberts to do the head.
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Old 09-22-2004, 17:29   #8 (permalink)
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Re: To build with JMM or not ?????

If you're changing the pistons, I'd change the rods too. Using AU spec rods and pistons would improve any bottom end as the reduction in rod angle means its much smoother at high revs.
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Old 09-22-2004, 17:33   #9 (permalink)
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Re: To build with JMM or not ?????

Do these AU rods fit straight onto the E series crank?
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Old 09-23-2004, 05:34   #10 (permalink)
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Re: To build with JMM or not ?????

good question can anyone answer this ??? can i bolt the au rods onto my exisiting crank????
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