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Austrailian heads project


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I'm gearing up to assemble a modified engine for my '71 Mach 1. The build up will include a handfull of mods which I can do at the shop, and that may very well be of interest to some other 351c owners. This engine will be in a everyday driver, so an all-out assault on power and speed is not the point, however, some of the mods will seem sort of "racey", but I'm doing them because I can, and It's what we do at work.

First up, are the cylinder heads. As a driver, and a tow vehicle, torque and streetability are prime objectives. I've been running the standard 2V heads for years, but, I think the Aussie 302 closed chamber heads are the way to go, along with the appropriate Icon pistons to keep the C/R liveable with todays gasoline, with good quench and torque happy ports at street rpm. To start off here, I had the heads acid dipped to remove the majority of rust in the water jackets. The guy in charge of cylinder heads, at work here, loaded the heads into the mill for me, for some precision machining of the rocker pedestals, and drilling , tapping of the rocker arm bolt holes to accept 7/16ths screw-in studs and Manley guide plates. I will be running a street grind hydraulic flat tappet cam, but why not do 'em up. They will be receiving  stainless single groove valves, along with a port and bowl work, hardened seats,  and combustion chamber relieving ( valve un-shrouding ). Note, the mill is numerically controlled, so angles, depths, and spacing are perfect and repeatable. Ruben, you the man! Here are some photos to start with...more to come.

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Edited by Spike Morelli
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Sounds like a great upgrade for your ride. Keep us posted. What compression ratio and what cam is in your plans?

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1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump

Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes

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Spike, 

I am looking forward to your in-depth built thread here. Followed by your explanations as an experienced engine builder it will be of much interest! 

Thank you :thumb:

Tim

 

Never drive faster than your guardian angel can fly :runninpony:

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Awesome Spike!! I will be following this. Thank you for sharing.

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Good Post! Following this one.

Black 1971 Mach 1

351C/FMX/TrickFlow Heads/Lunati Retro Roller Conversion

Classic Auto AC, Manual Front Discs, Upgraded Springs/Shocks/Close-Ratio Steering

 

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19 hours ago, Spike Morelli said:

Tony, I'll have to post the page from Icon's catalog, showing the special piston inverse dome that goes with the Aussie head chamber configuration. These heads have a smaller combustion chamber than the 4V Clevelands do, and therefore, will raise the compression ratio higher than what pump gas can handle, so a special piston is required. If memory serves, the compression ratio with the Icons is somewhere around 9.0 to 9.5:1.  Chamber cc's , deck volume, and gasket volume , can be juggled, and will dictate the final C/R. The dish in the piston top resembles the chamber shape, so the quench area is retained. The cam I have penciled in to use is one of Crower's milder grinds, I believe they call it the "Torque Monster", or some such name. I'm still on the fence as to the final cam choice, I want to do some more investigating. All of my notes are at work, I am on the internet when I get home, so I'll have to make a note to bring home information. 

The car will be used everyday, the car is an automatic and has A/C and power brakes. No "big lopey Hero camshaft" is even considered, rather a smooth idle. My spare block is a 2-bolt main, as is the engine currently in the car. Lifter bore bushing, and oil system mods are scheduled, and will be photographed and posted. Ignition will remain the Pertronix retrofit system, as it has performed flawlessly for so many years now. Induction is an Edelbrock prototype ( I posted photos elsewhere ) 4v intake for 2v heads , Holley 4160 most likely, although I like the Summit shoebox carb ( formerly sold and designed by Holley ), as it has all the features of a Holley and the Autolite 4100 4v carb combined.

As a side note here, I may take the heads into the flow bench room to get a baseline on what they have  un-modified. This would give me a perameter for the camshaft, then, re-flow the Aussie heads after mods, if any, prior to assembly. At work, I am in charge of Assembly. Assembly is the "make-or-break" moment ( no pun intended ), and I will post detailed assembly technique along with cam degreeing, etc.  I built a hot 406 Ford FE for my ski flatbottom, and posted it to a boat site, and many people told me how much they enjoyed it....so that is what I'm going to do again, here, but with the Mustang engine.  

Some fun shots of my handiwork....a '26 Whippet and a Ferrari 250

 

Is the ICON piston the IC881 by any chance? I ask because that's the one I have, but I don't have Aussie head.

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1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump

Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes

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Tony<
Great that you are sharing your knowledge on engine building. I miss the days of being able to walk in my friends engine shop and build an engine. Seems like most of my old racing friends have departed. Back in the 60's we did not have all the great equipment they have today.

When a man is in the woods and talks and no women are there is he still wrong??:P

David

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Spike, Thanks for taking the time to post the details of the build. I'm especially interested in the before and after head flow numbers as I've never worked with 302C heads before. Chuck

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Yeah Chuck, I personally haven't ever flowed any heads at the shop previously, as I am the Engine Assembler, and the head dept is manned by two other guys. One of the head dept guys has been doing heads for 35 years now, is super talented ( Ruben ) not only with the heads, but is a master welder, self-taught no less! So he will show me the ropes with the Superflow Bench. Keep in mind that this will be a street engine, and , depending, I may not be focusing on any flow figures above, say around .500" to .550" lift.

I am doing a Hi-Po 289 con-currently, and looking at moving out of state, so the postings may take longer to put together. Add to all that we're super busy right now at work...Geeeezze, everybody on furlough is digging out projects.

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Spike, It sounds like a busy time for you. From what I have read in many places the stock flow seems to plateau at about .450 lift. it will be interesting to see some real data. Where are you considering relocating to? There are a lot of friendly gear heads here in Oklahoma. The cost of living is reasonable, and other than the recent insane cold spell, the weather is moderate. Thanks for keeping us updated. Chuck

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If you want to relocate I am 100 miles from Charlotte a hot bed for NASCAR. Also lots of drag racers here. One local engine builder Ben Barnes that did lots of boats engines and NASCAR is about to retire. Might be a place to check he is in Asheville, N.C. . Was going to get him to do my machine work, balance and dyno my next build. We use to Kart race at same track. He was two stroke we were 4 stroke. He won 95% fo the races probably. That would be a move coast to coast but no mud slides, fires or earth quakes either. Can snow ski, go to beach and hunt if you are into.

When a man is in the woods and talks and no women are there is he still wrong??:P

David

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