I was pulling apart my camaro today to install my headers, and I noticed I have F@cking iron heads!!!

THe casting # is 12554290. I looked them up. THey are off of an LT1 style reverse cooling 350sbc from 1994-96. They are truck heads.

Those flow alot worse than regular alum. LT1 heads, right?

I've always noticed that the car is a dog at high rpm, and my timeslips prove it. the car runs mid to high 9's in the eigth.

 

Stock LT1 iron heads flow better than the aluminum heads do. They just don't dissipate heat as well and therefore cannot benefit from more timing advance.

If they were on a truck, it would have had to have been an LT1 engine and no LT1 ever came in a truck.

 

They are from an Impala, Caprice, Buick, Caddy. I don't think they put the lt1 in trucks. I had those heads on my car an then changed to the aluminum heads and found no real gains stock to stock.

 

Like shoebox said, those heads didn't come off a truck. Your heads or maybe even the whole engine came out of a Caprice, Impala, or Roadmaster.
Those heads do flow a bit better than the aluminum stock-for-stock, but those LT1 engines had 260hp due to using a milder camshaft. That should explain why your car seems to be a dog at higher RPMs.

 

Yea, you could have an LT1 out of B body, it might even be a 4.3 LT1.

 

The iron head b-body motor has an identical bottomend to the f-body. The cam is a little milder BUT the intake and exhaust were grandpa quiet and it was tuned for 87 octane. In bolton trim they make pretty similar peak power and everyone who has tried both in the same car agrees the b-body motor makes a little better bottomend torque. Guys have had both in the same car because like many of you they ASSumed the f-body motor had to be vastly superior and swapped them in and most actually admitted their disappointment.

While most guys want to believe the b-body motor was "detuned" I actually wonder if it was the Vette and f-body motors that had lowned torque intentionally limited to save the weak rearends. The b-body motor was only "detuned" in the sense it got 87 octane tuning the hardware itself is still quite good.

 

Hmmm... Nice to know.

I looked up the casting # on one website real quick and it said the heads were out of a reverse cooling LT1 style 350 truck. Thats where I got the truck idea.

I'll look at the casting # on the block tommorrow to see if I have an entire B-body motor. It wouldn't suprise me if I did. I bought this car for pennies on the dollar and it was kinda in shambles.

I have an M6, so I highly doubt that I have a B-body tune. I do believe that I have a b-body cam though. I have a vac gauge, and the car idles at 22" of vacuum! My 3.8 SII v6 idled at 19".

I bought a set of lunati valve springs to install tommorrow because I am going to install an LT4 hotcam when it arrives.

Should I put my valvesprins on my iron heads, or just wait and buy some stock aluminum heads in a month or so?

 

I'd stay away from that website.

 

werd.

If YOU were in my position, would you keep the iron heads, put springs on them, and then slide in a hotcam, or.......

just ditch the heads for a set of stock alum heads?

 

Not worth it to swap to STOCK aluminum heads. Buy a set of 643 or 374 aluminum LT1 heads. Leave the irons and stock cam in it until you decide to send the heads to Advanced Induction for some portwork. Put an A.I H/C package on the car and be done with it.

 

I got some stock aluminum heads with 56k calling your name!