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quote:
Originally posted by Dr Terry
Hi Guys.
This question of cross-flow & twin-cam heads for Holden 6-cyl motors pops up regularly & some of it is urban myth, so I thought that I would tell you what I know to be fact.
The Repco ‘Hi-Power’ cross-flow head was designed by Phil Irving (of Vincent motor cycle & Repco Brabham F1 fame) & was only made to suit the Grey motor. Opinions vary, but it appears that between 100 to 150 of these were made.
The ‘Waggot’ twin-cam head was also only made to suit the Grey. It was designed & made by Merv Waggot of Waggot Engineering at Greenacre in Sydney. Only about 6 or 8 of these were ever made, making then rarer than rocking horse poop.
To my knowledge, there were 2 other heads made for the Grey motor, but again these are very rare. There was another twin-cam head made by Fred Foster (2 or 3 made) & there was also the Dunstall ‘Rotary Valve’ head (6 or 8 made).
Phil Irving also made (this time separate from Repco) a hi-flow head for the Red motor, but only 2 or 3 were ever made. These were not a cross-flow design, but had a high intake port, angled at 45 degrees.
Frank Duggan also designed a similar head to the high-port Irving head for the Red motor. Many of these were made. Duggans head design was also used in American speedway Chevy 6 & Chevy II (4-cyl) engined cars. AFAIK the Duggan Holden head design (& the dies?) was sold to another guy, who now calls them j.ZED. These are still available today.
I’m sure that there are other one-off Holden heads out there, that we’ve never seen, but other guys have thought more laterally & used heads of other motors to improve the performance of the Red motor. I’ve seen the Falcon alloy cross-flow head fitted to a Holden 202, which, as BrianH has said is far from a bolt-on fit. Believe it or not the bore-centre to bore-centre dimension of the Falcon 6 is the same as a Holden 6, making it at least ‘do-able’. They weld up the hole where the thermostat fits & reverse the head so that the rockers line up on the same side of the motor as the cam. A lot of welding & machining is involved because the head bolt-holes don’t line up, but I know of at least one of these conversions that is complete & working. This would be even more difficult with the Ford 6 DOHC head.
Most of this is, of course beyond the average DIY home mechanic.
Does anybody out there know of any other ‘special’ Holden heads that exist?
Dr Terry.
Dr Terry. Not bad but: There were closer to 200 Repco made. I can place about 30 of them There were 26-30 Dunstons made I know where several of them are. There were 9 or 10 Twin cam Waggots made. I know where most of them are. There were 2 Foster Twin OHC heads made, I know where the last one is. Foster also made a V12 that was designed to run 2 Repco Crossflow heads. As for other special Grey Heads: Vauxhul 12 ports heads were used Video: https://www.youtube.com/watch?v=j0djH_ks9yA
Jag head was cut and modified for Grey motor, have pics will find.
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quote:
Originally posted by GreyFC
Dr Terry. Not bad but:
There were closer to 200 Repco made. I can place about 30 of them
There were 26-30 Dunstons made I know where several of them are.
There were 9 or 10 Twin cam Waggots made. I know where most of them are.
There were 2 Foster Twin OHC heads made, I know where the last one is.
Foster also made a V12 that was designed to run 2 Repco Crossflow heads.
As for other special Grey Heads:
Vauxhul 12 ports heads were used Video: https://www.youtube.com/watch?v=j0djH_ks9yA
Jag head was cut and modified for Grey motor, have pics will find.
That post was nearly 8 years ago, I've gathered more info since. It's good to hear from somebody with 'real' knowledge. It would be great to have all of this info in one place, instead of spread all over the internet, 'willy nilly'. Dr Terry |
If at first you don't succeed, just call it Version 1.0 |
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quote:
Originally posted by Dr Terry
quote:
Originally posted by GreyFC
Dr Terry. Not bad but:
There were closer to 200 Repco made. I can place about 30 of them
There were 26-30 Dunstons made I know where several of them are.
There were 9 or 10 Twin cam Waggots made. I know where most of them are.
There were 2 Foster Twin OHC heads made, I know where the last one is.
Foster also made a V12 that was designed to run 2 Repco Crossflow heads.
As for other special Grey Heads:
Vauxhul 12 ports heads were used Video: https://www.youtube.com/watch?v=j0djH_ks9yA
Jag head was cut and modified for Grey motor, have pics will find.
That post was nearly 8 years ago, I've gathered more info since. It's good to hear from somebody with 'real' knowledge.
It would be great to have all of this info in one place, instead of spread all over the internet, 'willy nilly'.
Dr Terry
...keep up all the good work Dr Terry .. hindsight is such a wonderful thing for some types and a few blokes here jumping in probably reckon you should have it in spades ...(groan)... ...all the best and Cheers from Phil Edited by user Tuesday, 24 March 2015 7:42:59 AM(UTC)
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I agree. To much good info is being lost. I guess that's why I decide to dig up such an old post :)
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...my closest foray into owning a Repco Hi-Power head was in 1978 when I was offered the ex Barry Ferrari drag car head sitting on the floor in the corner of a workshop in East Keilor. The fella wanted $200.00 for the lot...it had been fairly heavily modified with some cracking around the combustion chambers due to having some very large valves fitted, and still had the extractors Ferrari had run in his FJ.... ...I baulked at the deal because as a first year apprentice on about $50.00 a week, I couldn't see myself spending a months pay on something that would need a lot of work to get right again....even though I REALLY wanted it ! ...I never saw the head again, but I'm sure it'll be out there somewhere Edited by user Monday, 14 March 2016 2:42:59 PM(UTC)
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Originally Posted by: detective  ...my closest foray into owning a Repco Hi-Power head was in 1978 when I was offered the ex Barry Ferrari drag car head sitting on the floor in the corner of a workshop in East Keilor. The fella wanted $200.00 for the lot...it had been fairly heavily modified with some cracking around the combustion chambers due to having some very large valves fitted, and still had the extractors Ferrari had run in his FJ....
...I baulked at the deal because as a first year apprentice on about $50.00 a week, I couldn't see myself spending a months pay on something that would need a lot of work to get right again....even though I REALLY wanted it !
...I never saw the head again, but I'm sure it'll be out there somewhere That would be this one: http://www.thegreymotor....m-unblown-fj-repco.html
 
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...it was exactly that one .. same extractors, filler cap etc. I recognised it back then from that very article that was published many years earlier. Thanks for the link. Edited by user Saturday, 11 June 2016 6:24:34 PM(UTC)
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