The Aluminum Heads from 440 Source

[694spdRT]

I run a split gring Engle K56/k58 on a 110 LSA in my 440 4 speed Charger with 3.54's and have been very happy with it. The cam has a nice sounding idle but it is not a thumper and the power brakes work fine. It has very crisp throttle response and pulls hard. I am using a set of heavily ported 906's with oversized valves on my 440 and used ported factory intake and exhaust manifolds. Keep in mind my car is a show/street car so if you are into dragging there may be better options.     

[Chatt69chgr]

Thanks for the reply 694spdRT--------that's exactly the kind of information I am looking for.

[firefighter3931]

Personally, i prefer a wide lobe seperation (reduced overlap) with restrictive manifolds....less intake charger dilution. The factory HP cam was cut on a 115* lsa so what does that tell ya. 



Ron

[Chatt69chgr]

Ron-----you mentioned using the K56 with 112 LSA.  Would you also recommend using the split grind too----------that is--------K56 intake K58 exhaust and 112 LSA?  Note that the Engle website says that the K56 is for 9:1 CR.  The K58 is for 9:1 to 9.5:1 per their data sheet.  My understanding is that you want somewhere between 9:1 and 9.5:1 for 93 octane pump gas with iron heads (static CR) and a point higher for aluminum heads due to heat loss.  I would think you would want go toward the higher end of the CR, ie, 9.5 (10.5 for aluminum) since the Stealth heads are closed chamber allowing you to achieve true quench and thereby reduce detonation tendancys.

[firefighter3931]

Ron-----you mentioned using the K56 with 112 LSA.  Would you also recommend using the split grind too----------that is--------K56 intake K58 exhaust and 112 LSA?  Note that the Engle website says that the K56 is for 9:1 CR.  The K58 is for 9:1 to 9.5:1 per their data sheet.  My understanding is that you want somewhere between 9:1 and 9.5:1 for 93 octane pump gas with iron heads (static CR) and a point higher for aluminum heads due to heat loss.  I would think you would want go toward the higher end of the CR, ie, 9.5 (10.5 for aluminum) since the Stealth heads are closed chamber allowing you to achieve true quench and thereby reduce detonation tendancys.

Chatt, those numbers are only recommendations from Engle and they tend to be a little on the conservative side. An open chamber iron head will be much more octane sensative than a closed chamber aluminum head. 

Building from scratch ; the right way to go is with a flattop piston at zero deck and a closed chamber aluminum head for 10.5:1 compression and tight quench. This will maximize the power and still run fine on pump gas.

The cam LSA in this case is strictly a function of the restrictive exhaust. Manifolds don't scavenge very well and you want to reduce overlap to keep intake charge dilution (reversion) at a minumum. As for split pattern grinds ; they generally work better with a stock head which has less than the ideal 70% intake/exhaust flow ratio. The better aftermarket heads have that imbalance worked out so having additional duration on the exhaust side isn't as critical. You could go with a split grind but it won't make much difference, inmo. (assuming the Stealth/Edelbrock etc...) 



Ron

[694spdRT]

My 440 is right at 9.5 to 1 compression with the iron heads.  When I talked with Engle the 4 speed also made using the 110 LSA less of a factor. To be honest, maybe there is a difference in having a 112 over a 110 LSA but I haven't noticed any weak areas in the powerband.  I wanted a nice sounding idle and already knew the factory intake/exhaust manifold setup and factory exhaust system was a compromise on power. With my 14" redlines if there were a loss of power between the two cams I would not be able to tell. 

BTW: Chris(Just 6T9 CHGR..) used a K56 ground on a 108 LSA in his 440. He uses a CH4B and factory exhaust manifolds. His car has an automatic with 3.55 gears. I remember he had a video with sound of the idle someplace.

[375instroke]

it does not appear to have the same flow numbers as an eddy head althought the eddy numbers are from edelbrocks site.
Stealth/Eddys
100 --- 65/79 --- 57/70
200 --- 135/143 --- 108/126
300 --- 191/207 --- 140/160
400 --- 227/256 --- 159/188
500 --- 242/278 --- 173/206
600 --- 254/291 --- 183/217
700 --- 261/292 --- 191/223

This is impossible.  The Source heads are supposed to be Eddy copies.  How could they possible have different flow numbers?