Eddy heads on basically stock 440...

Posted By: cdp

Eddy heads on basically stock 440... - 03/21/11 02:42 AM

I have a stock 70-440 take out motor that is low miles and in excellent condition.

My thoughts are to keep the stock shortblock, except a 268XE Comp cam, a CH4B intake, 3310 holley, factory magnum manifolds, and stock Eddy heads with a true dual exhaust.

With proper tuning, can I expect 400 HP?

Anyone else use Eddy's on a relatively stock motor?

I do have a good set of headers also, but would prefer to use the manifolds.

All going in a 66 Coronet.

Posted By: DaytonaTurbo

Re: Eddy heads on basically stock 440... - 03/21/11 02:49 AM

I took a stock mid 70's smogger 440 and threw on a set of 440source stealth heads, lunati voodoo 60303 cam, summit headers, new timing chain and new piston rings. Was a night and day difference between stock and with mods.

Use the headers and I think the xe268 is a bit smaller than the cam I ran.

Posted By: RapidRobert

Re: Eddy heads on basically stock 440... - 03/21/11 03:09 AM

Quote:

With proper tuning, can I expect 400 HP?
Anyone else use Eddy's on a relatively stock motor?

Andy made 550 HP on a 470 w eddy heads, HP manifolds/3" mandrel ex. Might b in the archives for more details on it & it'll get you motivated

Posted By: ahy

Re: Eddy heads on basically stock 440... - 03/21/11 03:13 AM

The Ed heads should help a lot... better breathing and a little more compression. I think you can make 400+ HP with a little more cam. For making power with manifolds, see Andy F's articles in the archives. From the article, the MP "528" mechanical flat tappet cam seems to do well with manifolds.

With that cam and around 10:1 CR for pump gas, you should get above 400 HP. When you pull the old heads, you can measure piston height and figure compression. You may need to mill the Ed heads a little to get where you need to be.

Posted By: cdp

Re: Eddy heads on basically stock 440... - 03/21/11 03:16 AM

I really would like to do the 440source heads rather than the Eddy's, but, I'd have to send them to someone for cleanup/inspection before bolt on. Which everyone seems to recommend.

The eddy's you don't. So, toss up. If there were a really reliable person here in KC I could trust with the 440source's, I'd probably go with them.

The cam, t-chain, headers I already have. I made a mistake on the cam, Its a comp XE274.

The 440 isn't apart yet, but I'm assuming the pistons are about .085 or so in the hole on a stock LP 70-440.

Posted By: gch

Re: Eddy heads on basically stock 440... - 03/21/11 03:18 AM

It will be a torque monster all day long.Will work fine as is.
Depending on your wants with a little more cam the power will jump quickly.Something like the XE275HL for starters.Lots of others to choose from as well.Even the XE274 will make a boost and keep the stock rockers.

Posted By: ahy

Re: Eddy heads on basically stock 440... - 03/21/11 03:29 AM

The XE274 looks like its in the right ballpark for your goals... about 230 intake duration @.050. The rest comes down to details - which can make power.

The mechanical flat tappet - MP .528 or other - can help with the added expense of adjustable rockers. If you go that route, suggest ductile iron Crane's or Comp "pro magnum" for durability.

Posted By: cdp

Re: Eddy heads on basically stock 440... - 03/21/11 04:19 AM

It will be a street car, 4-door sedan with A/C. I don't want to get radical, just livable and with some high 12's or so 1/4's.

Posted By: DaytonaTurbo

Re: Eddy heads on basically stock 440... - 03/21/11 04:31 AM

With the XE274 you should be where you want to. Will be a nice running combo and will be able to use the stock rockers/pushrods. I would highly suggest running headers with that cam. Also make sure your rear gears and torq converter are appropriately matched. And be ready to curve your distributor and tune your carb for the new combo.

Quote:

I really would like to do the 440source heads rather than the Eddy's, but, I'd have to send them to someone for cleanup/inspection before bolt on. Which everyone seems to recommend.

The eddy's you don't. So, toss up.

FWIW I bolted on my 440source heads without sending them to a machine shop first. No problems yet and my car didn't blow up. You can take this for what little it's worth but there's guys on here who say eddys need their valve guides honed and valve job checked before using them, and there's guys who say 440source heads need the same. Then there's guys who've bolted either of then on straight OOTB without problems.

Posted By: 540challenger

Re: Eddy heads on basically stock 440... - 03/21/11 01:05 PM

Quote:

I really would like to do the 440source heads rather than the Eddy's, but, I'd have to send them to someone for cleanup/inspection before bolt on. Which everyone seems to recommend.

The eddy's you don't. So, toss up. If there were a really reliable person here in KC I could trust with the 440source's, I'd probably go with them.

The cam, t-chain, headers I already have. I made a mistake on the cam, Its a comp XE274.

The 440 isn't apart yet, but I'm assuming the pistons are about .085 or so in the hole on a stock LP 70-440.

I must stress this any aftermarket part should be inspected before bolting it on/in a motor. There was a thread just last we about the an eddy head ahving an issue that needed to be corrected from OTB. BE it the eddy or 440 source get it checked out. Heck you could always buy the head thorugh one of the engine builders on here have them inpected and shipped to you.

Posted By: Mr.Yuck

Re: Eddy heads on basically stock 440... - 03/21/11 01:13 PM

I'd think you could be close to 400 w/o the heads. Headers, intake good cam and a tune and I'd bet you'd be really close to that. My old 67 coronet (3850lbs) went 12.90 @ 104mph with a stock 70 440 rebuild (9:1 at best), Summit 488 cam, RPM intake 750HP carb, 1 3/4 headers, stock 906 heads with a fresh valve job. That's about 338hp at the rear wheels pretty close to 400 if not a shade more. If you plan on more mods I'd go w/ the eddy's if not just use some of that money to clean you haeds up and roll. And why buy expensive hi-flowing heads and choke them up with Manifolds?

Posted By: 540challenger

Re: Eddy heads on basically stock 440... - 03/21/11 01:19 PM

Found the thread https://board.moparts.org/ubbthreads/show...rue#Post6531069

Posted By: JohnRR

Re: Eddy heads on basically stock 440... - 03/21/11 02:52 PM

Quote:

Quote:

I really would like to do the 440source heads rather than the Eddy's, but, I'd have to send them to someone for cleanup/inspection before bolt on. Which everyone seems to recommend.

The eddy's you don't. So, toss up. If there were a really reliable person here in KC I could trust with the 440source's, I'd probably go with them.

The cam, t-chain, headers I already have. I made a mistake on the cam, Its a comp XE274.

The 440 isn't apart yet, but I'm assuming the pistons are about .085 or so in the hole on a stock LP 70-440.

I must stress this any aftermarket part should be inspected before bolting it on/in a motor. There was a thread just last we about the an eddy head ahving an issue that needed to be corrected from OTB. BE it the eddy or 440 source get it checked out. Heck you could always buy the head thorugh one of the engine builders on here have them inpected and shipped to you.

don't assume anything is ready to go as sold .

Another thing you need to do if you are going to run manifolds is to put a gasket on the heads and make sure the gasket does not overhang the ports , then put the same gasket on the manifolds and make sure the openings are at least as big if not a little bigger than the gasket openings . I just did this and found the manifold ports as much as a 1/4" smaller than the gasket opening , especially the end ports.

Posted By: BSB67

Re: Eddy heads on basically stock 440... - 03/22/11 12:47 AM

Quote:

I have a stock 70-440 take out motor that is low miles and in excellent condition.

My thoughts are to keep the stock shortblock, except a 268XE Comp cam, a CH4B intake, 3310 holley, factory magnum manifolds, and stock Eddy heads with a true dual exhaust.

With proper tuning, can I expect 400 HP?

Anyone else use Eddy's on a relatively stock motor?

I do have a good set of headers also, but would prefer to use the manifolds.

All going in a 66 Coronet.

Yes - you can achieve 400 hp with what you plan without the headers. Make sure that it is a true 10:1 CR, maybe 10.2:1 when you are done and feed it with a good carb. It might also respond well to milling the divider or adding an open spacer. Test to know for sure.

Depending on weight, converter, gear and tire, you may or may not be able to get into the 12's.

Posted By: Pacnorthcuda

Re: Eddy heads on basically stock 440... - 03/22/11 01:13 AM

Quote:

Quote:

I have a stock 70-440 take out motor that is low miles and in excellent condition.

My thoughts are to keep the stock shortblock, except a 268XE Comp cam, a CH4B intake, 3310 holley, factory magnum manifolds, and stock Eddy heads with a true dual exhaust.

With proper tuning, can I expect 400 HP?

Anyone else use Eddy's on a relatively stock motor?

I do have a good set of headers also, but would prefer to use the manifolds.

All going in a 66 Coronet.

Yes - you can achieve 400 hp with what you plan without the headers. Make sure that it is a true 10:1 CR, maybe 10.2:1 when you are done and feed it with a good carb. It might also respond well to milling the divider or adding an open spacer. Test to know for sure.

Depending on weight, converter, gear and tire, you may or may not be able to get into the 12's.

Yep! And you'll then have a car that would REALLY gain some power with headers.

Posted By: DaveRS23

Re: Eddy heads on basically stock 440... - 03/22/11 01:22 AM

A few years ago I bolted a box stock set of Eddies on my old weary 440 that had a mild Hughes cam. At that time the big debate was whether the al. heads would loose more power than they would add due to the effective lower comp on the al. heads. That 440 was very tired and the OE comp was probably 8.5 or something.

I'll tell you how tired the thing was, it would blow the dipstick an inch or so out of the tube whenever I would wind it up. It had that much blow-by.

But the head swap alone netted a solid .25 sec difference in the 1/8 and picked up nearly 3 MPH. The car weighed 3,500 with me so you can figure the HP increase from 8.1 to 7.8.