SBC gen1 porcupine heads.

[Ericnova]

Whatever happed to the 4 valve Aris head that was around like 15 years ago.

I think I recall that being a bolt on 150 hp.

Are you thinking of Arao Engineering "Dominion" cylinder heads??

Russ Arao could never get it off the ground beyond a handful produced.
Scammed a lot of people.

[In-Tech]

Sorry, Russ never scammed anyone. He was just under budget. One of the greatest people I have met in my life. I am sorry if you had a bad situation with him.

[HQM383]

Another reason I like getting away from 23° sbc heads. Below pic red dot is where 23° aluminum aftermarket head spark plug is in the cylinder, blue is where spark plug is for G1 head.

[Tom68]

Another reason I like getting away from 23° sbc heads. Below pic red dot is where 23° aluminum aftermarket head spark plug is in the cylinder, blue is where spark plug is for G1 head.

Not that it's the only factor but how much advance does it like at peak torque ?

[HQM383]

Another reason I like getting away from 23° sbc heads. Below pic red dot is where 23° aluminum aftermarket head spark plug is in the cylinder, blue is where spark plug is for G1 head.

Not that it's the only factor but how much advance does it like at peak torque ?

32*-33*

[1980RS]

Another reason I like getting away from 23° sbc heads. Below pic red dot is where 23° aluminum aftermarket head spark plug is in the cylinder, blue is where spark plug is for G1 head.

Same thing goes for the Vortec heads. The plug is a lot closer hence needing way less total timing.

[skinny z]

Another reason I like getting away from 23° sbc heads. Below pic red dot is where 23° aluminum aftermarket head spark plug is in the cylinder, blue is where spark plug is for G1 head.

Same thing goes for the Vortec heads. The plug is a lot closer hence needing way less total timing.

What would be the PtH clearance in this example?
Isn't the thinking that a tighter quench also create a more active combustion chamber and thus requires less timing?
Just asking to see if that plays a part in the reduced need for more spark advance.

[HQM383]

Another reason I like getting away from 23° sbc heads. Below pic red dot is where 23° aluminum aftermarket head spark plug is in the cylinder, blue is where spark plug is for G1 head.

Same thing goes for the Vortec heads. The plug is a lot closer hence needing way less total timing.

What would be the PtH clearance in this example?
Isn't the thinking that a tighter quench also create a more active combustion chamber and thus requires less timing?
Just asking to see if that plays a part in the reduced need for more spark advance.

.039”

[pamotorman]

they were developed for the 302 trans am engine and they did not make enough more power to tool up to make them available on the open market where the $$$ are.

[Chris_Hamilton]

Sorry, Russ never scammed anyone. He was just under budget. One of the greatest people I have met in my life. I am sorry if you had a bad situation with him.

Gotta take issue with that. If he was under budget, he should never have taken orders for a product he did not have, not should he have lied about the prduct saying it would be delivered next week, next month, etc. If it happened once or twice I could understand, but there were dozens of guys who paid him for heads and never got anything. Thousands and thousands of dollars. Not just for the SBC but for the SBF as well. These guys were buying a product, not trying to fund his R&D to develop it. They were told they were or would soon be available. He outright lied to people. There are pages and pages of post on various forums detailing what he did and how much he took from people. He took 20K from one guy. And he got nothing for that money (youtube link)

Here are a few links to peruse

viewtopic.php?f=1&t=1585

https://www.gt40s.com/threads/fraud-ara ... are.24097/

https://www.youtube.com/watch?v=GbOq1O5y-Y0

https://stangnet.com/mustang-forums/thr ... ds.463688/

[SchmidtMotorWorks]

Those SBC gen1 porcupine heads have a port layout that makes designing a good intake manifold impractical.

[Tom68]

Same thing goes for the Vortec heads. The plug is a lot closer hence needing way less total timing.

They are a lot further into the bore area (more centralised) than say a 1960's fuellie, but it's only 2 to 4 degrees timing difference isn't it ?
Not that all else could ever be equal.

[1980RS]

Same thing goes for the Vortec heads. The plug is a lot closer hence needing way less total timing.

They are a lot further into the bore area (more centralised) than say a 1960's fuellie, but it's only 2 to 4 degrees timing difference isn't it ?
Not that all else could ever be equal.

My old fuelie heads would take 38-40° to make the best power, the Vortecs only need 32° for best power, at least that's what has worked for me.

[skinny z]

My old fuelie heads would take 38-40° to make the best power, the Vortecs only need 32° for best power, at least that's what has worked for me.

Is this locked out or have you built a timing curve for it?

[1980RS]

My old fuelie heads would take 38-40° to make the best power, the Vortecs only need 32° for best power, at least that's what has worked for me.

Is this locked out or have you built a timing curve for it?

Locked out.