Can anyone identify these Cylinder heads?

[It's just a six]

Re: Can anyone identify these Cylinder heads?

Not sure if it is really necessary to weld up the chambers as you guys did.

How much does it cost to weld? Do they crack?

Nolan dynoed that one engine w/L-35s w/a Hybrid Mitsubishi TDO6 & made how much power?

I also said the L-35's would probably flow close to the Vortecs when port ported The LB4's,thats a different story.

 

[DaveP]

Re: Can anyone identify these Cylinder heads?

My 95 astro van was in the last 50 made,when I redid the motor I almost shit,it had the same heads.6 bolt intake,notched for popit valves and heart shaped chambers with L-35 casting numbers.
Jack

OK. So is this quote/post for real, or part of the "ruse"?. If it's part of the ruse, you got me. If you truly thought you had these heads on your Astro Van, I know better than to trust anyone I don't know on the interweb.

I know it's very unlikely, more like impossible, to find the same casting number on two very different castings. I posted to that effect in this thread. I didn't pound the point because of the "evidence" shown in the quote above.

Dig had it right. He gets the SyTy bucks. Nice game. Next time let us know it's a game, OK?

 

[jpalmer]

Re: Can anyone identify these Cylinder heads?

My question is cost of welding/machining on a set of these heads. Its $500 for an intake job for Vortec's (or less if you know people) and that is about all other than cost of heads.

 

[Sportmachines]

Re: Can anyone identify these Cylinder heads?

The point of welding the material back in is to be able to remachine it with the hear shaped chamber, and while being machined, elimnate the "hot spots" in the chamber and make them more efficient.

Yes, Nolan made great power with L35 heads on a motor. We wanted to try and do something different. Have the ease of use of the L35 with some of the benefits of the vortec head.

They haven't cracked yet. And we don't see why they would.

Yes you can get the L35s to flow better, but its not just the flow that make the vortecs superior. Its the swirl runners, the velocity of the air and efficiency of the chamber. Thats what we were really trying to incorporate.

 

[WyoSyclone]

Re: Can anyone identify these Cylinder heads?

The point of welding the material back in is to be able to remachine it with the hear shaped chamber, and while being machined, elimnate the "hot spots" in the chamber and make them more efficient.

Yes, Nolan made great power with L35 heads on a motor. We wanted to try and do something different. Have the ease of use of the L35 with some of the benefits of the vortec head.

They haven't cracked yet. And we don't see why they would.

Yes you can get the L35s to flow better, but its not just the flow that make the vortecs superior. Its the swirl runners, the velocity of the air and efficiency of the chamber. Thats what we were really trying to incorporate.

Do you know which 181's they are.. early design, or '94 model??

 

[Sportmachines]

Re: Can anyone identify these Cylinder heads?

^^I honestly don't know. Sorry

 

[It's just a six]

Re: Can anyone identify these Cylinder heads?

Not sure the newer Vortecs are called high swirl runner design?

The LB4's are a high swirl intake port runner,great for low end torque,but thats it,the vane blocks.or makes the intake port window too small,,(kills airflow),, ,,just don't think the newer Vortecs (96 & up) are a high swirl design,@ least not like the LB4's IMO?

Cast iron heads have a tendacy to crack when welding, especially if the technique is incorrect.
Much easier to weld/repair aluminum heads.

 

[Sportmachines]

Re: Can anyone identify these Cylinder heads?

We dont think the heads will crack. They were properly welded in a oven. They headed up the heads, suited and welded then in the oven. We designed these heads over 8 years ago.

 

[WyoSyclone]

Re: Can anyone identify these Cylinder heads?

We dont think the heads will crack. They were properly welded in a oven. They headed up the heads, suited and welded then in the oven. We designed these heads over 8 years ago.

x2... looks like someone did a great job adding the material to those. My only question is regarding the sharp defining edge between the valves where the added material sweeps around the other valve. It looks machined, but I wonder if that sharp edge is a good idea with regard to creating a spot where pre-ignition may be created. Would a .060 radius there have been better?? I'm not criticizing, just trying to pry some secrets out of those who know

 

[Sportmachines]

Re: Can anyone identify these Cylinder heads?

Here are some porting pics. All hand ported. I will post ported flow numbers when I return from vacation. I do remember the heads were 68 cc's after porting.

I still cant believe Dig remembered us doing those heads.

 

[It's just a six]

Re: Can anyone identify these Cylinder heads?

Still did not post the flow numbers for these heads?

 

[TYTILIDIE]

Re: Can anyone identify these Cylinder heads?

Not sure how I ever missed this thread. IMO, it seems like an awful lot of work to go through for something that might not even work like the Vortec head does. I think the "swirl" is one of the main points of the Vortec head and if it can't be duplicated and costs more to set up or even the same then realistically you aren't getting any bang for your buck, if that is what people are after which is usually the case. I suppose with a mild performance gain you can keep your truck looking stock but other than that I don't see the point.

 

[Sportmachines]

Re: Can anyone identify these Cylinder heads?

IT actually wasn't nearly as bad as initially anticipated. We wanted to do some thing different, and keep as much stock and add in as many benefits as we could while keeping cost reasonable. While keeping it bolt on. Going from memory they flowed 230@.500. Mike, you're correct, the swirl is a tremendous benefit of the vortec head, and I couldn't imagine the cost and time in trying to replicate that. Might as well just design a new head at that point. The chamber shape is also a big advantage over stock so we incorporated that, obviously.