FE Power Cylinder Heads

[67428GT500]

Jay:
Are you planning on offering a head that looks like a factory head and fits factory intake and rockers?

                                                                                   -Keith

[Dumpling]

Why not just do a tunnelport-type configuration instead of the angled and offset pushrods?  Seems like it might be more straightforward...

[jayb]

Jay:
Are you planning on offering a head that looks like a factory head and fits factory intake and rockers?

                                                                                   -Keith

Nope, there are plenty of good heads out there using the factory configuration.  I wanted a head that was a step up in performance from those.

[jayb]

Why not just do a tunnelport-type configuration instead of the angled and offset pushrods?  Seems like it might be more straightforward...

It definitely would be more straightforward, but I didn't want to deal with a pushrod tube through the middle of the intake port.  My opinion is that a pushrod tube through the port just can't be good...

[70tp]

But, what if I like the pushrod in the intake port?  I really want some power improved tunnel ports.   Please.  Please.    Pretty please.    Lol.   

[Nightmist66]

And, in order to miss the port with the pushrod, a large offset is required on the intake rocker.  Here are two CAD drawings of what the pushrod configuration looks like:

Jay, without sounding too naive, how will pushrod to intake port clearance be? Being these are more for max effort builds, do you have an idea at what kind of lift that interference with the pushrod becomes an issue? What size pushrods were you thinking of using on this type of setup, 3/8 or 7/16"?

[Royce]

If the push rod went through the port you could fashion some kind of tricky little airfoil to direct the intake flow right where you want it..

[jayb]

Jay, without sounding too naive, how will pushrod to intake port clearance be? Being these are more for max effort builds, do you have an idea at what kind of lift that interference with the pushrod becomes an issue? What size pushrods were you thinking of using on this type of setup, 3/8 or 7/16"?

I'm hoping to stick to 3/8" pushrods, and be able to tolerate at least 0.900" lift.  I have an .880" lift cam that I'll be running on the dyno engine.  The Solidworks model says that the parts as is will fit at that lift level, but if I have to adjust the machining on the intake adapter to make it work, then I will. 

And by the way, I'm hoping that these heads work well for lesser builds, the idea being that the heads are so good that less cam and compression will be needed.  It would be nice to have a 650 HP FE that idles at 700 RPM and has good throttle response.  A really good cylinder head and the IR intake manifold will go a long way towards making that a reality.  I will be building a 445 stroker dyno mule to test that all out at some point.

[jayb]

If the push rod went through the port you could fashion some kind of tricky little airfoil to direct the intake flow right where you want it..

It already goes right where I want it to, Royce 

[TomP]

That is a lot of sideway angle. Is it going to make an issue of side thrust on the rockers? I could imagine it squeezing the oil out and galling the rockers against each other or the stands. Perhaps shims and lots of lube.

[Nightmist66]

Jay, without sounding too naive, how will pushrod to intake port clearance be? Being these are more for max effort builds, do you have an idea at what kind of lift that interference with the pushrod becomes an issue? What size pushrods were you thinking of using on this type of setup, 3/8 or 7/16"?

I'm hoping to stick to 3/8" pushrods, and be able to tolerate at least 0.900" lift.  I have an .880" lift cam that I'll be running on the dyno engine.  The Solidworks model says that the parts as is will fit at that lift level, but if I have to adjust the machining on the intake adapter to make it work, then I will. 

And by the way, I'm hoping that these heads work well for lesser builds, the idea being that the heads are so good that less cam and compression will be needed.  It would be nice to have a 650 HP FE that idles at 700 RPM and has good throttle response.  A really good cylinder head and the IR intake manifold will go a long way towards making that a reality.  I will be building a 445 stroker dyno mule to test that all out at some point.

Gotcha. I'm wondering if a 3/8" pushrod is a good idea on a .900" lift setup with the required springs to suit and that angle on the intake side. The pushrods I just had made for mine are .145" wall 3/8". That is as thick as I could get and for peace of mind. I would think maybe a 7/16" tapered would be needed?

 I had a feeling you would also be aiming at a mild mannered high-ish hp combo as well. I completely understand that aspect, too. I'm sure that would appeal to many people.

[jayb]

That is a lot of sideway angle. Is it going to make an issue of side thrust on the rockers? I could imagine it squeezing the oil out and galling the rockers against each other or the stands. Perhaps shims and lots of lube.

Tom, side thrust is certainly a concern and one of the reasons I have to run this setup for a while on the engine before I release it to production.  But I think that a couple of thin, spring steel washers between the rocker arms, and the rockers and stands, will allow it to live.

[Stangman]

Hey Jay I would assume the lifter also. Might not be as bad with a non bushed lifter hole as compared to a bushed. I dont know just thinking out loud.

[mbrunson427]

Just to be a pesky engineer..... assuming 10 degree pushrod angle, it'd turn a .900" lift cam in to an .886" lift cam. What pushrod angle does that end up being?

[Heo]

Just to be a pesky engineer..... assuming 10 degree pushrod angle, it'd turn a .900" lift cam in to an .886" lift cam. What pushrod angle does that end up being?

thought about that to. But since the rocker moves with the pushrod and lifter,,,,,
I dont think it reduce the lift and alter the angle