[slowbird]

Originally Posted by ho428

I need a set to put on a 433 for Vintage racing. Have to switch to Iron and a dual plane intake to be legal in a new sanction. Going to need around 600 hp and 7000 rpm's to be competitive.
Anyone built anything similar?

What fuel? You compression limited?

[ho428]

Originally Posted by slowbird

What fuel? You compression limited?

Given I run 30 minute and hour long races and go through 30-40 gallons a race weekend, I'd like to run pump gas, which is what I built my newest 433 using KRE's. But I seriously doubt I could get the HP I need using Iron heads and pump gas. New sanction doesn't care what compression I run or fuel.
I figured with IV heads and my current flat tops I'd end up around 11.5:1 or so, price I'd have to pay to play.

For the tracks I want to run in Vintage racing over the next few years I'll have to switch sanctions to run those. Basically, bucket list racing.
Vintage sanctions can be hard to jump one to the other unless your car is built to a nationally recognized class. An iron headed dual plane gets me within their rules.

[ponjohn]

Originally Posted by ho428

Given I run 30 minute and hour long races and go through 30-40 gallons a race weekend, I'd like to run pump gas, which is what I built my newest 433 using KRE's. But I seriously doubt I could get the HP I need using Iron heads and pump gas. New sanction doesn't care what compression I run or fuel.
I figured with IV heads and my current flat tops I'd end up around 11.5:1 or so, price I'd have to pay to play.

For the tracks I want to run in Vintage racing over the next few years I'll have to switch sanctions to run those. Basically, bucket list racing.
Vintage sanctions can be hard to jump one to the other unless your car is built to a nationally recognized class. An iron headed dual plane gets me within their rules.

Did they change the rules or did you change organizations?

[slowbird]

Originally Posted by ho428

Given I run 30 minute and hour long races and go through 30-40 gallons a race weekend, I'd like to run pump gas, which is what I built my newest 433 using KRE's. But I seriously doubt I could get the HP I need using Iron heads and pump gas. New sanction doesn't care what compression I run or fuel.
I figured with IV heads and my current flat tops I'd end up around 11.5:1 or so, price I'd have to pay to play.

For the tracks I want to run in Vintage racing over the next few years I'll have to switch sanctions to run those. Basically, bucket list racing.
Vintage sanctions can be hard to jump one to the other unless your car is built to a nationally recognized class. An iron headed dual plane gets me within their rules.

Compression is free hp/tq run as much as you can.
600+hp from a 433ci on pump gas and iron heads will pretty tough in my opinion.

[ho428]

Originally Posted by slowbird

Compression is free hp/tq run as much as you can.
600+hp from a 433ci on pump gas and iron heads will pretty tough in my opinion.

I realize Pump gas with Iron isn't going to happen, especially with a dual plane intake.
For longevity I'm thinking 11.5:1 or so would be the easiest on the internals for hr long races, and using IV's might have a shot at 600.
With such an engine I wouldn't have to swap engines but race fuel prices for a 4-5 race weekends a year gets expensive.
For budget concerns building one with Iron D's for the SVRA races and use my pump gas Aluminum head engine for HSR and VDCA races is the most practical since I have two almost identical 433 short blocks and I run primarily with VDCA.
SVRA runs nation wide, requires extensive travel and the Iron heads, so maybe 1-2 events a year over the next decade with them as I hit the bucket list tracks like Road America, Watkins Glen, Mosport, Mid Ohio, COTA and Laguna. Right now I run with HSR and VDCA, they allow my car to run as is, but they're regional and it took a lot of lobbying to get in with them.

It gets complicated trying to race a big inch Pontiac engine competitively in Vintage Road Racing.

[455-4+1]

Originally Posted by slowbird

Compression is free hp/tq run as much as you can.
600+hp from a 433ci on pump gas and iron heads will pretty tough in my opinion.

We were over 13.5 comp with our 408 with the iron head. Going to be tough to do on pump gas I agree

[ponyakr]

Is it possible that Torco Accelerator might work with pump gas, in order to make your race fuel a bit cheaper, but still provide enuff octane ?

https://torcousa.com/products/accelerator

It's available in 6 quart cases & 5 gal pails.

Don't know the cheapest current source, for total shipped price. Might depend on whether anybody still ships this without charging tax.

https://www.superchargedmotorsports....RoCP20QAvD_BwE

https://www.summitracing.com/parts/tic-f500010t

https://www.amazon.com/-/es/Torco-F5...M53AAK93BT23CT

https://autoplicity.com/1500494-torc...xoC_foQAvD_BwE

[ho428]

Found a set but the heat crossovers have steel welded in. I've seen Aluminum used but not steel welded in. Anyone seen this before?

[Scott Stoneburg]

Originally Posted by ho428

Found a set but the heat crossovers have steel welded in. I've seen Aluminum used but not steel welded in. Anyone seen this before?

Yes. Long time again, a freind had a set of d-ports with the exhaust cross over welded.. They looked really good. But unfortunately he never ran them.

[PAUL K]

Originally Posted by ho428

Found a set but the heat crossovers have steel welded in. I've seen Aluminum used but not steel welded in. Anyone seen this before?

Not uncommon.

[Dragncar]

Originally Posted by ho428

Found a set but the heat crossovers have steel welded in. I've seen Aluminum used but not steel welded in. Anyone seen this before?

Dan welded up my HOs and I welded up some 96s myself. You need Ni rod that is dissimilar metal and has a non conductive coating.

[GTO-relic]

old thread, here's the thing...
the guys that used to make the cylinder head molds for Pontiac and GM,
were true artisans, and craftsmen, in the old world sense.
to make a sandcast mold for the heads,
they first had to make a rough cylinder head from wood,
then that wooden head is used, to make the sandcast,
then the sandcast is assembled into a mold,
and the molten iron poured in.
the exterior as-cast surfaces you see on the exhaust side,
were first HAND WHITTLED from a block of wood.
that's why they look so cool, all those shapes in the porting,
interior and exterior.
so, they made a head from wood,
made a sandcast around it,
then assembled the sandcast mold, by hand,
then poured the molten iron in, to fill in the space,
where the wooden head was before.
that's what gave the Pontiac heads that cool adobe look.
because, in reality, they were adobe.
cast iron, hand crafted adobe.
these guys made like 7 bucks an hour or so back in the old days.
you can't afford it today. it's 85-100 bucks an hour or more.
just to make a mold, that gets destroyed to make a cylinder head.
you'd have to get 10 grand per head to make them that way today,
just for the bare head.
so in reality, RA II IV V HO SD heads, are a bargain today.
be happy you can even find them, and buy them.
want a head that looks like that ?
then make a mold from an original head, and pour it.
stop trying to improve it.
if you find King Tut's coffin, or the Holy Grail,
you don't try to improve it. you preserve it.
if you find the Mona Lisa painting,
you don't try to touch it up to make it look better.
that completely destroys its value.