Perfect working condition 305H.O. heads casting number 416 great for those looking to keep their 305 and build good power I used them on a LB9 tpi and made 251 to the wheels but I recently upgraded to L30 vortec heads and a stealth ram I'm looking for 300 dollars I put 500 into them should be bolt on ready only a little dirty from living on a dirt road the inside is super clean and the heat tab is still good never overheated. Will trade for tubular torque arm or subframe connectors

 

these heads make great power for an everyday driver

 

Those heads are no different from LG-4 305 heads. I gave a set to a friend of mine a couple years ago...

 

You might want to do some research if they are the same heads as an LG4 head. then the LG4 and the L69 would have the same power ratings right but the LG4 at best was rated between 135-145 depending on state and the L69 was rated at 180-190 depending on state for emissions as well the only difference between the two is the cylinder head and the L69 H.O. got the 416 casting

 

LG4 heads are the 601 casting number they came on trucks and low-po Camaro/firebird they usually came with tiny intake valves 1.72 where as the 416 casting came with a 58cc combustion Chamber 1.84 intake and a 1.5 exhaust valve but I don't doubt that you gave your friend a set of crappy heads

 

So please I've only been racing 305's for 27 years straight tell me where I'm wrong

 

They did share the same heads. They did not share the same pistons, exhaust and camshaft thus the 40+ HP difference. These heads are decent though no argument there, definitely not a bottleneck for a 305.

 

I have ripped apart many LG4 blocks over the years and the only heads I've ever seen in the F and G body LG4 are the 601

 

Also I only believe my own eyes I've seen an LG4 optioned with a bigger factory camshaft I've seen them with both cast iron and aluminum intakes but never seen them with anything but the crap version of 601 head. My buddy and I have an unmolested LG4 berlinetta with 48,000 original miles starship edition I wish it came with those

 

Same size valves (1.84/1.50) and ports except '82. The L-69 305 had flat-top pistions which bumped the compression to 9.5:1, a hotter cam, and a more free-flowing exhaust system...

 

I had an 87 LG4 with 081s. Engine blew up and got an LG4 out of another 85-86 Firebird and it had 416s.

 

Jezuz, The seller is right ,right, damn right, 416 never came "stock" on lg4, It doesn't matter what you bought used anywhere, simple as a lookup.
Either they were put on as replacment or that was not an lg4.
Dude has it in print, lol.

 

Except he's wrong and you are as well. My 85 z28 with a lg4 has the 416 heads. Car had never been apart before I pulled the heads. Others have shared similar knowledge. Just because someone wrote down the wrong info does not make it true. My car is proof at least some LG4s got the 416 heads.

 

Where is that chart from? I'm not saying it's accurate (I actually don't think it is) but I'd like to see more of it.

That's funny because I've never seen a set of 601's original on a 3rd gen f-body. I actually went looking for a set (cut them for some larger valves and minor decking and porting and you have something at about 54cc and a chamber shape very close to a high swirl modern design) I ended up having too look for a set from I believe '79-81 cars and got some out of a second gen.

With most of these cars being around 35y/o it's hard to prove that anything is original. OTOH, I bought my first one in '91 and I've had 2 or more f-bodies the whole time since.... here is what I'm pretty sure of:
- I've never seen any evidence of 601s made past '82 (in person, casting dates and documentation that can be trusted), but they were dead common as replacement and rebuilds for up to '86. I suspect that if you have 601's on a 83 and up they've been swapped, possibly by a dealer.
- _All_ the pre '87 3rd gen 305's that I've seen have had 416s on them but I've seen 416's with 1.76 and 1.84" intake valves. I suspect that all LG4's were supposed to have 1.76" intakes but I wouldn't be surprised if people found original looking LG4's that have the larger valves, again, rebuilds, dealer repairs... I know of one out of an '84 Z28 that looked all original, has been in the same family since new and had 1.84's on one bank and 1.76 on the other. FWIW, the LG4's should have had dished pistons and an 8.4 (? something in the mid/low 8's) compression,, the L69 had flattops and 9.5:1 and the LU5 (Crossfire) had flattops and 9.8:1. I don't know what the difference was between the L69 and Lu5 to get the extra compression but I suspect that it was deckheight or gasket thickness. I've actually tested an LU5 and found that it was pretty close, never tried an L69.
- all '87's should have had '081's but I wouldn't be surprised if the swap from 416's to 081's happened before or after the model year change. FWIW, LB9 (TPI) '87's are supposed to be 9.3:1 (and if they existed I believe that '87 L69's were also), with 081's and flattops, but my '87 TA with an LB9 (I bought it low mile, and it looked all original with the correct casting numbers and factory shim gaskets, even leaking factory style valve cover gaskets... no evidence that it's ever been opened, correct cam...) but I found that it had dished pistons and when CC'ed I got 8.3:1 compression.

 

I had a 1986 Sport Coupe with original engine never touched and had 416 castings. Like others had mentioned difference is in cam, pistons and exhaust.