Jon Kaase has built an engine using the Thor heads and I think it produced some very impressive results. You would have to ask him the particulars of the build but I think it was a 706 cubic incher.

The Thor head will require different pistons than the A heads, unique intake, shaft mount rockers, titanium valves etc. They need to be on a very large bore too. Not for the faint of heart.

 

How big of bore? 4.6" too small?

Why titanium? Is the length too long for stainless/inconel?

What I am trying to determine more than anything else is will my headers work. I have A heads now.

 

i think there pretty much all to there selves on everything the valves are so big you need titanium to reduse weight i believe there are a couple guys on here that are running them i talked to one about buying a set but just wasnt in the budget for this year when you have to throw in the new pistons for valve reilief and intake and bigger carbs and headers

 

Like everybody has said the thor head is it's own deal, serious power, but serious $$$ too! They are basically a more finished version of the prostock E ford head. It could take up to $15,000 to switch from A's to thors. Have you maxed out your A combination? You could maybe put $5000 in what you got or move up to newer A heads and be money ahead?

 

I have older A heads on a 8.9 to 1 604s making 873hp at 6500 and am happy with that. I am building 2 more motors with new A heads and we expected to get the flow #s easier than the older heads but it appears they will be about as much work as the older heads.

I was curious. I won't let myself have custom water jacketed headers made over no matter how good the Thors are 8) .

 

THOR HEADS , LOL. IF YOU CAN GET THEM NOBODY HAS THEM NOT EVEN THE FIRST GERERATION I WAS WAITING ON SECOND GEN AND THERE NOT GONNA BE DONE ANYTIME SOON, AND ON TOP OF THAT THERE ARE NO PROGRAMS AVAILABLE FOR THEM EITHER AND HE MOVED A BUNCH OF STUFF AROUND ON THEM AND THERE IS ALSO NO ROCKER SYSTEM AVAILABLE EITHER. I WENT WITH THE PROFILER'S ATLEAST EVERYTHING IS AVAILABLE AND THEY ARE A BAD A$$ HEAD. EVRTHING IS ITS OWN EXCLUSIVE DESIGN FOR THE BLUE THUNDER STUFF CHARLIE EVANS OF THIS SITE HAS A KILLER C- HEAD PROGRAM ALSO AND EVERTHING IS AVAILABLE FOR THEM AS WELL BUT AS FAR AS YOUR EXHAUST PORT LOCATION CONCERN THE C HEADS AND PROFILER'S ARE BOTH RAISED OVER THE A & B HEADS.

 

THOR HEADS , LOL. IF YOU CAN GET THEM NOBODY HAS THEM NOT EVEN THE FIRST GERERATION I WAS WAITING ON SECOND GEN AND THERE NOT GONNA BE DONE ANYTIME SOON, AND ON TOP OF THAT THERE ARE NO PROGRAMS AVAILABLE FOR THEM EITHER AND HE MOVED A BUNCH OF STUFF AROUND ON THEM AND THERE IS ALSO NO ROCKER SYSTEM AVAILABLE EITHER. I WENT WITH THE PROFILER'S ATLEAST EVERYTHING IS AVAILABLE AND THEY ARE A BAD A$$ HEAD. EVRTHING IS ITS OWN EXCLUSIVE DESIGN FOR THE BLUE THUNDER STUFF CHARLIE EVANS OF THIS SITE HAS A KILLER C- HEAD PROGRAM ALSO AND EVERTHING IS AVAILABLE FOR THEM AS WELL BUT AS FAR AS YOUR EXHAUST PORT LOCATION CONCERN THE C HEADS AND PROFILER'S ARE BOTH RAISED OVER THE A & B HEADS.

I wanted some Blue thunder heads but after waiting long enough I decided TFS Yes they are good heads but some of the wait time is LIKE watching an Oak grow from sead to 50 ft tall, and some of the guy's selling them are not even dealers. The thor heads are for BIG cubes and lots of RPM and all custom parts to fit.



Randy

 

I wanted some Blue thunder heads but after waiting long enough I decided TFS Yes they are good heads but some of the wait time is LIKE watching an Oak grow from sead to 50 ft tall, and some of the guy's selling them are not even dealers. The thor heads are for BIG cubes and lots of RPM and all custom parts to fit.



Randy[/quote]

here's the story as i heard it. my new all aluminum block is coming from c&c motorsports carrol told me that art francis ( owner of blue thunder) is having quality control problems with his castings so he went to a small metal forgery out in california. i guess its a quality shop but because its so small and everybody is on to this place now, the foundry doesn't want to loose any business so they are making promises on manufacturing deadlines that they can't keep and they are way behind. my engine builder is good personal friends with art and i actually have an thor intake but couldn't get heads. now from what i understand art has maybe like a handful of the new thor castings at his shop but refuses to set up his tooling to do only a few sets of heads he wants to run off 50 or so at a time understandibly so but IMOA pump out the sets you have and atleast put out a few fires and get some r&d going on these things. i waited long enough since last year i heard about the new heads and got fed up and went to the profiler's. also from what i heard the 2nd gen heads intake ports were raised up another .300 over the originals the exhaust ports were moved over .100 and the rockerstand bolts got relocated out of the intake ports, so there won't be a readily available rocker system for these for quite some time either. but i totally agree these heads will be bad *** and are for larger mountain type motors on a motor like mine i would have to spin that bitch to 10,500 rpms the ports are huge also part of the reason why he made these new heads was to be able to bolt them on out of the box because he is getting tired of all these places getting crazy money to cnc them. i heard 550 cfm's right out of the box on the intake ports and i'm sure the exhaust are around 400.

 

I understant that a good friend of mine lives just down the street from Art and he is so busy but waiting for the sun to burn out is quite a wait.
I guess I will be running a set of TFS or C heads instead of waiting for any thing from Art.

JMHO
Randy

 

Thor Heads

I have a set of Thor heads cnc ported by ET Performance. They were put on a 470" engine to replace a set of E-460 heads. They made quite a bit more power and, suprisingly, a lot more torque. My heads utilize a WW Engineering rocker arm setup. Any other questions?

 

I am curious as to the interchangeability between these heads and other high port heads. Anyone know the following?

Valve stem length?
Valve angle? Location?
Intake port location? Are adapters needed?
Exhaust port location, Higher than A-heads?
Exhaust bolt pattern? BBC?

What would need to start over from an A-head engine?

Thanks!

Call Derek at BB & T in South Haven MS. They have a set of Thor heads going on their 700 + twin Turbo 10.5 W Car :shock: Derek is up on the Thor stuff.

 

Re: Thor Heads

I have a set of Thor heads cnc ported by ET Performance. They were put on a 470" engine to replace a set of E-460 heads. They made quite a bit more power and, suprisingly, a lot more torque. My heads utilize a WW Engineering rocker arm setup. Any other questions?

What kind of compression and RPM?

It is hard to judge from these pictures. I like the way AT add all the little things like helicoils, headbolt seats and water jacket access plugs.