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Should be picking up my balanced components today hopefully ready for a dummy assembly to chase 10.2:1 CR. I’ll keep you all posted. ✌️

Hey Richard, Sorry for the delay in response, I purchased them though a company here in Australia called Hemi Performance. They are from a 318 truck motor apparently, but the 273/318 heads are exactly the same so will bolt up without issue. If you zoom in on the photo I posted you can see the...

Never know if you don’t try!! ✌️

All components dropped off for balancing today!! Very excited to say the least!!!

Nothing like coming home to a set of NOS closed chamber 273 heads!! ✌️

Just read your thread Mike!! Thank you mate!! Luke

@toolmanmike Great thread!!! Thank you for bringing my attention to your build, it’s / your very inspirational!! A lot of great information and tips that will come in handy!! Cheers Mate, Luke

Thanks for the information guys. Dummy assembly is taking place either next week or the week after. Waiting on my NOS closed chamber heads to arrive and for my components to be balanced then the. Will let you know what final numbers are. Looking forward to it, another early 273 saved from the...

I’ve had my cam reground with this grind, should hopefully wake her up a little with the 500cfm Edelbrock on top of the LD4B.

I’ve had 8 heads crack tested (4 x closed chamber & 4 x open chamber) and they’ve all come back cracked, either through the combustion chamber or around the two end bolt holes closest to the exhaust manifolds. I’ve just payed for a NOS set of closed chamber heads, which is what I was wanting...

Definitely no sharp bits, I’ll post a better photo.

Hi mate, I realise this thread is old but I’ve been trying to research the 273 Commando pistons, especially the RC pistons you mention here. I recently bought a set of .030 Rebuilders Choice 4bbl Commando pistons and am needing the dome volume. I’ve been reading anywhere from 15cc’s to what you...

Really? Wow that’s a lot more than the 11.5cc I read elsewhere. Will have to measure them up as that’s a lot of variance. Cheers mate.

My mechanic as pretty switched on so can work it out. RC said they made them from factory 273 Commando pistons so was curious as to what the factory specs were. I did read on a thread somewhere that a guy did cc the pistons I have and they came in at 11.5. Yep, closed chamber heads. It’s a...

Thanks for the response guys, it’s appreciated. Does anyone know what cc’s the factory Commando pistons were? There is so much literature on the net in regards to practically everything else bar that.

I’ve been really lucky I think. Parts are very expensive here in Australia. I purchased a full engine rebuild kit out of the States for the price that I would have paid for pistons and rings here in Australia. I’ve been reading anywhere from 15-11.5cc’s for the Commando Pistons. I read a guy...

Hey Guys, I’ve recently purchased a new set of Rebuilders Choice 4bbl Commando Pistons and need the dome volume in cc’s to calculate my CR. I’ve contacted Rebuilders Choice but they are unable to provide the information but said they made them from factory 273 Commando Pistons. I’ve attached a...