390 build...maybe??
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From: in the woods of Maine!
390 build...maybe??
I've got either a 360 or a 390. the Block is from 73, the rest is from 67-8, the Pistons say "390 4V" on the outside, and they say "C8AE", which if I'm correct are from a 4 barrell 390 in a Galaxie.....I believe the crank is a 360 crank, but I've read that if you use 390 pistons w/ a 360 you'll have no compression, but I've definetely got that. I had C8AE-H heads on it, but I found a set of C1AE, and I've also read that the C1's have bigger ports, but it looks like they have a bigger cc........all these facts are just idea, but I'm not sure about any of them, could someone set me in line?
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From: Iowa
You've got a 360! Ford used a LOT of "390 4V" pistons in 360's. That's what 360 pistons are!
You see, there more than one type of 390 piston. There was the 1.776" compression height flat tops like you've got (most compression), there was 1.776" compression height dished pistons (2V pistons), and there was 1.68" compression height 390 truck pistons.
390 crank and rods, and a replacement set of 390 4V pistons, and you'll have your 390. You do need to have your block overbored to remove the ridge left by the 360 pistons.
Use the C1AE heads!!! They flow better than the C8's. Just make sure you put in hardened exhaust seats so you can run unleaded gas. The C8's would need 'em too, so use the better C1 heads.
You see, there more than one type of 390 piston. There was the 1.776" compression height flat tops like you've got (most compression), there was 1.776" compression height dished pistons (2V pistons), and there was 1.68" compression height 390 truck pistons.
390 crank and rods, and a replacement set of 390 4V pistons, and you'll have your 390. You do need to have your block overbored to remove the ridge left by the 360 pistons.
Use the C1AE heads!!! They flow better than the C8's. Just make sure you put in hardened exhaust seats so you can run unleaded gas. The C8's would need 'em too, so use the better C1 heads.
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From: in the woods of Maine!
I would like to bump compression a little, and I was thinking about have the heads milled, I may even do it myself!, but at any rate, how many thousanths can I take to end up w/ a 10:1 or so, or could I be able to achieve that from thinner head gaskets alone?...it looks like the 61 heads would have a bigger combustion chamber....so I also didn't know if I would have to take that into consideration.
I've read about these oiling mods, and I was wondering what else could I do instead of putting a #90 jet in the heads where the rocker support oil hole is?
I've read about these oiling mods, and I was wondering what else could I do instead of putting a #90 jet in the heads where the rocker support oil hole is?
Last edited by LedheadELH; Aug 28, 2005 at 11:04 AM.
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Post Fiend
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From: "Islander"
If the heads are off, tap the 45 degree passage then install a grub allen set screw that has been annealed and drilled to the restriction of your choice. I'm running restrictors at .058" the last 243,000 miles.
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.....=o&o>.....
Postmaster
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From: iowa
the chamber size plays a role in comp ratio. If you want to increase comp ratio, milling .010 off the block will do more than .010 off the heads. If you are going with a 390 and short rod, 1.76 comp height pistons leaves .030 deck clearence. You could mill .010 off the block and .020 deck clearence and use a .020 head gasket. I am not sure what the compression would be with the c1ae heads but i am not sure what you want to do either.
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From: Iowa
You'll have to get your heads CC'd before we go decking the block or heads, or anything else that drastic. There's a lot of variability with head gaskets, and plenty of piston options to get the compression you want.
Go get your heads CC'd, then check back, and we'll come up with a combination that will give the compression you want.
You're not going to mill anything yourself, unless you have a mill! It's a very high-percision type thing involving an expensive machine tool. Let a machine shop do it.
Go get your heads CC'd, then check back, and we'll come up with a combination that will give the compression you want.
You're not going to mill anything yourself, unless you have a mill! It's a very high-percision type thing involving an expensive machine tool. Let a machine shop do it.
Postmaster
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From: iowa
there are a lot of ways to go to acheive 10 to 1 compression but if someone is going to spend money by milling, the block will yield more compression than the heads. I imagine 1.76 ch pistons, .020 head gasket will do the job or get it close enough.
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From: in the woods of Maine!
well I do not want to mill the block, I am a Machinist...well I was.....BUT, if I can get 20 out of the heads that's not a problem, I've got the resourses.....I jsut need to know how much I can shave before I have valves hitting my pistons........milling the block, and new pistons aren't what I plan to do, I hope to boost compression through shaviong the heads, and getting a thin head gasket
I do not know how to get the heads CC'd as you guys say, but I do have the numbers from between the 2nd and 3rd exhaust ports...they are
C1AE 6090 A
the 6090 could be 9060, but I'm pretty sure it's not, well I don't know if that halps on the CC'n thing, but if not let me know
BTW, I'm looking for upper 9's, lower 10's on compression
I do not know how to get the heads CC'd as you guys say, but I do have the numbers from between the 2nd and 3rd exhaust ports...they are
C1AE 6090 A
the 6090 could be 9060, but I'm pretty sure it's not, well I don't know if that halps on the CC'n thing, but if not let me know
BTW, I'm looking for upper 9's, lower 10's on compression
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From: Smith Mountain Lake, VA
Well when it come's to milling the heads...approx.. .006 to 008" off yields about 1cc if chamber volume (depending on chamber shape) and as Carl said sinking the Intake and exhaust Valve's about .010" each will give about 1cc up in volume size..
Also remember when you mill the deck of the heads you'll also need to mill the Intake surface so the Intake seats properly.....Dont mill the Intake!!
Now with my 433" build.....I had my C4AE-G heads ported and had them CCed..so I would know where I was at to match the rest of the components!!
Like the Guys are saying there has to be a known starting point..and you can go from there.. JMO!! Good Luck,
Russ
Also remember when you mill the deck of the heads you'll also need to mill the Intake surface so the Intake seats properly.....Dont mill the Intake!!
Now with my 433" build.....I had my C4AE-G heads ported and had them CCed..so I would know where I was at to match the rest of the components!!
Like the Guys are saying there has to be a known starting point..and you can go from there.. JMO!! Good Luck,
Russ
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From: "Islander"
Russ, with your heads reworked and ready to install what is the combustion chamber cc's numbers? Last night I was looking at KB forged pistons that have offset dish for any compression you want plus still have a large area on top for tight quench.
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From: Smith Mountain Lake, VA
Carl, there all CCed to 76CC's...... I just talked to KC..and he said that Probe now also makes a forged Piston with a dish top for are FE's....and he will get back to me on the Different Dish CC's.....they are $40 a set for the dished pistons... $399 a set for the Flat top with a 4cc Valve relief and $439 a set for the dish....
Keith said $399 was a good price...thats what Alex Gets for them at Alex Hardcore parts in Cal.. and Keith said he would match whatever price I could find!!
Dont want to steal this thread!!! Sorry!! LOL..
Russ
Keith said $399 was a good price...thats what Alex Gets for them at Alex Hardcore parts in Cal.. and Keith said he would match whatever price I could find!!
Dont want to steal this thread!!! Sorry!! LOL..
Russ
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From: Smith Mountain Lake, VA
the Flat top have a -4cc valve relief, and the dish pistons,will vary, These will be a production run, and are sitting on the shelfs as we speak....
KC is going to get back with me on the different Dish CC's...
Russ
KC is going to get back with me on the different Dish CC's...
Russ
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From: in the woods of Maine!
so then basically it'd be way better to just go w/ a new set of pistons for the 300 bucks, for that compression?
another Question I'v got is, if I were to do my own work on heads, I still want my intake runners in my heads to be a litle rough so it mixes the feul/air better, but the exhaust can be smooth right?
another Question I'v got is, if I were to do my own work on heads, I still want my intake runners in my heads to be a litle rough so it mixes the feul/air better, but the exhaust can be smooth right?
Last edited by LedheadELH; Sep 12, 2005 at 08:26 PM.