big chief heads

[threefingers]

i have a pair of heads with #10045427 cast into head under valve cover.can anyone help with specs./how old?.they use jesel shaft rockers,have spring oilers,have water supply lines to area beside each exh. guide.#PC074 and 873 stamped into front of head.all other identifying marks/numbers milled off.they came with what looks like an old pro stock style engine we want to use @ saltflats. thanx for any help, bob.

[Dart Vader]

Is "Dart" or "Oldsmobile" stamped anywhere on the heads?

[threefingers]

Is "Dart" or "Oldsmobile" stamped anywhere on the heads?
the heads were sold as dart big chief ,after more research turn out to be really old brodix pontiac prostock style heads.sorry to have taken up your time.thank you,Bob.

[Dart Vader]

It's no prob at all.

Sorry your heads aren't what they were purported to be!

[Awesome Bill]

I have a set of those heads on my engine, they make great power with the sheet metal. They are old but they do work. Run 7.00's @ 2350.

[threefingers]

thanx bill. heads look good , just going to clean them up/ vac. test /inst. new springs. what would you recommend for seat press.? inst. height (now) is 2.010" /press. 200psi. looking for help with lash recommendations.lift is .810"with 1.7 rockers.cam has no #'s. had cam profiled but left info @work .can post cam specs. monday if it would help. block is cast iron/ heads have arp studs/copper gskts.

[want-a-be]

200 pounds on the seat doesn't sound like enough seat pressure to me. Need to bump that up to at least 240 or so imo. What is the pressure when it's on the toe of the cam?

Don

[Awesome Bill]

If it is titanium valves, 275 is decent. If its stainless, 350 minimum for the intake. What valves do you have or have I missed this somewhere. Anything under 275 is not good @ all for these heads. You ever weighed a stainless intake for something like this?

[threefingers]

valves are titanium i think , they are very light for the size of them.what is best seat material for Ti ? can post valve sizes/weights (as well as cam info) when i get back to shop. is there any way to determine actual valve material?. thanx for all the help so far , this has been a steep learning curve.

[Awesome Bill]

copper berylum but I have run nickle with little trouble or wear. 350 on the seat is where we run these!