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Old 08-14-2013, 07:22 AM   #1
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Question about PI heads

I've been looking on Craigslist and I found a guy selling a couple sets of pi heads from an 03 and 04 mustang. He wants 350$ for a set and they both have about 40,000 miles on them. Is that a good deal? I have a 98 gt an already have a pi intake, so should i get this or wait for something better? I'm currently in the process of changing piston rings and bearings so I'm already pretty deep into the both engines I'm working on. So should i or no?

The pic is where I'm at now and i want to get done in a few weeks or so.
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Old 08-14-2013, 08:27 AM   #2
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Do yourself a favor just go 4v lol. 40k miles on pi heads aint bad....however i would still find cheaper. Plus depending on what your outlook for your motor is while you have it for pistons and bearings now would be ideal to upgrade the bottom end first. Forged crank and rods. Pi swap does wonders for our years however if u plan to push more than 450 hp id build bottom end. Also if u can get the heads slightly ported not too much but a little to flow better. Its really up to u. 350 sounds high unless hes selling both sets.....then do it and u could sell the other all your choice

---------- Post added at 09:27 AM ---------- Previous post was at 09:25 AM ----------

Also i would upgrade vale springs and retainers if u plan on camming it with a stage 2 or so
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Old 08-14-2013, 08:49 AM   #3
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Too much money, also 03 heads will not be the 8 thread spark plug holes. ALSO, there is way more involved to going 4V then just doing the heads.

Offer him $200 cash for the 04 heads and if he says no then walk away.
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Old 08-14-2013, 11:10 AM   #4
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^What he said. Do it once and do it right. Hold out for the 8 thread castings, there are tons and tons out there. Maybe have the ports touched up a little with new springs and retainers and maybe some of Nick's (MHS) reground intake valves for PTV clearance. At $40 for a set of 8 they're a steal.
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Old 08-14-2013, 11:42 AM   #5
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Originally Posted by scottydsntknow View Post
Too much money, also 03 heads will not be the 8 thread spark plug holes. ALSO, there is way more involved to going 4V then just doing the heads.

Offer him $200 cash for the 04 heads and if he says no then walk away.
What's the difference between the 03 heads and others? Like the spark plug holes?
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Old 08-14-2013, 01:37 PM   #6
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What's the difference between the 03 heads and others? Like the spark plug holes?
The 03 heads only had like 4 threads for the spark plugs, blowing plugs out was an issue I believe
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Old 08-14-2013, 02:24 PM   #7
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So should i get the 04 with 40k on it and put it in? Does that one have 8 threads? I've been thinking about it and i think I'll get some pi heads for an engine now and put it in so i can at least drive it and with the other engine I'll go forged internals and everything. I have plans on getting my stang over 550 hp to the wheels. That'll be a bit ways off though!
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Old 08-14-2013, 02:25 PM   #8
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The 03 heads only had like 4 threads for the spark plugs, blowing plugs out was an issue I believe
Dang that's sucks, makes me not want to change my plugs, is there anything I should watch for when changing them? I've done plugs before on my sixxer but not on a GT
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Old 08-14-2013, 08:21 PM   #9
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Yeah, remove them carefully and then install the new plugs by hand and then USE A TORQUE WRENCH to put them to 12 ft lbs/144 inch lbs. Harbor freight sells a 1/4 drive torque wrench that will go to 144 inch lbs for not very much money. It is required when doing plugs on these cars, even the later 8 thread castings. I've got to do the plugs on my 03 Expy soon... at least on the stang the plugs don't break off like they do on the Expy...
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Old 08-14-2013, 08:47 PM   #10
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Not trying to hijack and I think it's appropriate. Are all the PI heads the same?
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Old 08-14-2013, 11:24 PM   #11
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Not trying to hijack and I think it's appropriate. Are all the PI heads the same?
No some have 4 thread some have 8 threads. It varies along with some other goodies. Expo and f150 heads work well. Just dont get the triton heads with the 9/16 socket plugs those love to break lol. Scotty should correct me on it if anything
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Old 08-15-2013, 04:01 AM   #12
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FML on the Triton heads... I need to get a spark plug removal tool for when I do my Expy. There are also Windsor vs Romeo heads. Windsors are used in 99/00 cars, Romeos in 01-up. Windsor heads have more valve cover bolts, use larger bolts for the front cover and the cam sprockets are bolt on vs the press on ones the Romeos have.

As I said, find a set of 04-up heads and pay $200 for them at most. Hell, you can get a set of unrevised C heads for not much more off of a Continental in a JY if you look...
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Old 08-15-2013, 07:40 AM   #13
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Thanks for the info yall!! I appreciate it!
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