4 valve heads......

[Keoki1978]

Check this out, I dunno if anyone has seen these before but just imagine a 24 valve pushrod V6. I'm tempted to call these guys and say hey, but I dunno what kind of price they'd be asking..

https://www.araoengineering.com

it'd be bad ass to have a bolt on head like these. There are some videos on street fire with a blown SBC, thing revs like nothing there...

http://videos.streetfire.net/video/32-valve-small-block-e_120868.htm

Alot of info out there, just wanted to know what you guys think..

[SappySE107]

Why not use a DOHC 60V6 and save the expense. Im not even sure they would care to do it with the design of our pushrods (canted valve, half the traditional head is the lower intake). Very cool but really only practical for the V8s that are common to modify and without a 4 valve per cylinder option.

[Keoki1978]

Still not bad though. There was a 32 valve DOHC GM V8, but it didnt live very long. The newer 3.6 DOHC would be kool to get ahold of but not enough in the bone yards yet around here..

[Guest]

I looked at using the 3.4 DOHC heads on a pushrod. After setting a DOHC head on a pushrod block I abondoned that idea pretty quickly. IIRC it was the intake pushrods that were lined up almost in the middle intake port, the exhaust pushrod was also in a position that would interfere with intake port. I know I could have welded tubes to and through the intake port, but that seems to be counter productive to what I would be trying to accomplish with the 4 valve head.

[geoffinbc]

Crazy. You got some bragging rights if you have those babies. The sure have impressive numbers, price included. Seems in the case of 4 valves per cylinder that a DOHC design might shave some weight off the valve train and I thing you could get a New Northstar V8 for the price of those heads.

Don't forget the Duramax Diesel has 4 valve push rod heads

[Keoki1978]

I was thinking bout the same thing, one cam to grind vs 4, and half the valve train components. Even if you had to have a completely different intake manifold, itd be some shiznit there. You could raise the ports say 1/2 inch to clear the pushrods, and even keep the heads square instead of tilted back 15 degree as the 60* heads have for a 90* between the valley. And square up the ports "[]" like they had to do.

Other things I've seriously thought bout was a different design head with the heart shaped combustion chamber rotated 90* so that the intake valve was centered with the bore along with the exhaust valve, kinda like the hemi design, but a heart shape cumbustion chamber as we have now. Have the valves angled in say 10-23* toward center, thatd be some shiznit also.. Just some thought though..

[1988GTU]

I would love to have a DOHV engine.

[Guest]

I was thinking bout the same thing, one cam to grind vs 4, and half the valve train components. Even if you had to have a completely different intake manifold, itd be some shiznit there. You could raise the ports say 1/2 inch to clear the pushrods, and even keep the heads square instead of tilted back 15 degree as the 60* heads have for a 90* between the valley. And square up the ports "[]" like they had to do.

Other things I've seriously thought bout was a different design head with the heart shaped combustion chamber rotated 90* so that the intake valve was centered with the bore along with the exhaust valve, kinda like the hemi design, but a heart shape cumbustion chamber as we have now. Have the valves angled in say 10-23* toward center, thatd be some shiznit also.. Just some thought though..

Uhh, raising the ports won't do you any good, since the pushrod would have to pass through the area that the intake port occupies.

The space between the lifter and the lower part of the intake port is only a couple inches at best, probably close to 1.25", it has been a while since I did this. I recall though there was no way to keep the stock OHV cam layout and use the DOHC heads in a way that would promote good flow into the intake ports.

I thought about cutting the head apart and moving the intake port sideways, but that would then mess with the flow balance between both intake valves.

Overall it seemed to be way more work than it would be worth and with the 3400 and 3500 heads available that flow very well for a small displacement 2-valve head, it just seemed way more logical to work with what was available.

[geoffinbc]

it just seemed way more logical to work with what was avialable.

This is typically the case. Since the beginning of hot rodding you took what the factory gave you tried to improve it more than the next guy and ran with it.

[gectek]

Still not bad though. There was a 32 valve DOHC GM V8, but it didnt live very long. The newer 3.6 DOHC would be kool to get ahold of but not enough in the bone yards yet around here..

yah GM still has that...its called the northstar...

[gectek]

Crazy. You got some bragging rights if you have those babies. The sure have impressive numbers, price included. Seems in the case of 4 valves per cylinder that a DOHC design might shave some weight off the valve train and I thing you could get a New Northstar V8 for the price of those heads.

Don't forget the Duramax Diesel has 4 valve push rod heads

alot of diesels do that...they use spider (v'd) rocker arms when not using the shaft mounts...there was a custom LT1 4v head made by a company in dallas...used some diesel V'd rocker arms. it was pretty amazing

[geoffinbc]

yah GM still has that...its called the northstar...

He could have been thinking of the LT5 from the Corvette which only lasted a few years. The N* came after.

[gectek]

well how many people think about the LT5...not many people know of it and there sure arent many running around. only came in the ZR-1 vette and prob one or 2 experimental f bodies...

[Keoki1978]

Yeah, was thinking of that Vette small block. But anyways, dohc V6 would be sweet. I just say that push rod 4 valve head on the small block and was like damn. I did call them and they said that with a hydralic roller, its possible to get it up into the 8000rpm range, and with a rev kit, its doable to 9000 range. Those heads they say flow more than any 2 valve head on the market period. But price is to much......

[gectek]

there are only 1 type of 2 valve head on the market....STOCK