ando76

Be careful buying Yella Terra clevo for xflow if your buying a new set. YT have changed the design of their rockers.  God only knows why they would change a design that's worked faultlessly for so many years, especially on a Clevo that went out of production 40 odd years ago, but they have. 
 
The new clevo design uses a 17mm pedestal whereas the old design uses a 14mm - same as crossflow. Some sets of the new design went out with a 14mm pedestal before they realised the new design has geometry issues on clevo if you try and use a 14mm pedestal - ask me how I know. Arghhh. So long story short - if your buying new for crossflow - specify xflow. 
 
But as others have said there is no advantage in a stocker and fitting them under the rocker cover with stock efi is a right pain.  

Be careful buying Yella Terra clevo for xflow if your buying a new set. YT have changed the design of their rockers.  God only knows why they would change a design that's worked faultlessly for so many years, especially on a Clevo that went out of production 40 odd years ago, but they have. 
 
The new clevo design uses a 17mm pedestal whereas the old design uses a 14mm - same as crossflow. Some sets of the new design went out with a 14mm pedestal before they realised the new design has geometry issues on clevo if you try and use a 14mm pedestal - ask me how I know. Arghhh. So long story short - if your buying new for crossflow - specify xflow. 
 
But as others have said there is no advantage in a stocker and fitting them under the rocker cover with stock efi is a right pain.  

don't let BGDAV see it, he's already lost weight on the "car parts diet" (where you prioritise car parts over food)

Yeah mate. JB in Ayr does CNC as do AED, I think that's who did FORD MAN's.  There are obviously several other hand porters also doing them of which Cam, who does my stuff and did Luke's head is one.  The flow results I post in the porting thread are the results of Cams work, flowed on an independent flow bench.  
Sean (clevo 120y) was doing them, but I believe he sold his bench.  Rob is using LHT race engines as noted in his thread. Jason Murphy in Toowoomba has also played with them with some success. At the end of the day there are a few choices mate. Obviously none of them are going to be cheap.  But cheap and fast very rarely go together.  

Yeah mate. JB in Ayr does CNC as do AED, I think that's who did FORD MAN's.  There are obviously several other hand porters also doing them of which Cam, who does my stuff and did Luke's head is one.  The flow results I post in the porting thread are the results of Cams work, flowed on an independent flow bench.  
Sean (clevo 120y) was doing them, but I believe he sold his bench.  Rob is using LHT race engines as noted in his thread. Jason Murphy in Toowoomba has also played with them with some success. At the end of the day there are a few choices mate. Obviously none of them are going to be cheap.  But cheap and fast very rarely go together.  

Oh no, here comes the 'what is a true street car' arguement. Oh no.  
Fact is Glen's, Ken's and Jason's cars aren't / weren't registered street cars. They are however fast. These days with the hoon laws and driving an illegally modified car on the street(one without all relevant mod plates and engineering certification) is fraught with danger. Especially in Qld.  
I've been jumping through some big hoops with the engineering on my corty, but at the end of the day it will carry all the necessary mod plates and certificates to make it road legal. It's not a cheap excercise but it's worth it in the long run. But it will still be a light car, cause in my racing experience a light car with weight innthe right areas is a fast car. 
Chestnut old son - do what you want with your car. And if you want to develop a high port head - go for it.  I was just highlighting that it's not necessary.  

Oh no, here comes the 'what is a true street car' arguement. Oh no.  
Fact is Glen's, Ken's and Jason's cars aren't / weren't registered street cars. They are however fast. These days with the hoon laws and driving an illegally modified car on the street(one without all relevant mod plates and engineering certification) is fraught with danger. Especially in Qld.  
I've been jumping through some big hoops with the engineering on my corty, but at the end of the day it will carry all the necessary mod plates and certificates to make it road legal. It's not a cheap excercise but it's worth it in the long run. But it will still be a light car, cause in my racing experience a light car with weight innthe right areas is a fast car. 
Chestnut old son - do what you want with your car. And if you want to develop a high port head - go for it.  I was just highlighting that it's not necessary.  

There is a video of the car running at Willowbank on my business Facebook page,  Tonys Metal and Speed.  
Luke races Pro Stock Motorcyle. He is accomplished racer. I doubt he will be letting on to anyone the actual weight of the car. And good on him. Fact is it's fast and will get faster.  I don't know too many go karts that weigh a tonne. 

Irrespective of what it weighs, it is fast. Good to see another fast 250.

If you contact any of the decent convertor companies around with all your data, car weight, dyno graph showing both torque and hp and answer some questions honestly on application they should be able to build a convertor to suit YOUR engines needs and your person needs. 
Pits a black art, best left to the experts in my opinion. Not the old 'such and such runs a 4500'. 

If you contact any of the decent convertor companies around with all your data, car weight, dyno graph showing both torque and hp and answer some questions honestly on application they should be able to build a convertor to suit YOUR engines needs and your person needs. 
Pits a black art, best left to the experts in my opinion. Not the old 'such and such runs a 4500'. 

Yeah it's not to custom, you may have heard me talk about the grind once before. 
Seems it doesn't need a roller at the minute. 

Who needs a high port crossflow head.

One of our heads, 254@.050 flat tappet, four barrel in a sedan. Untuned and only second time at the track. Told you it would be fast chestnut.




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Who needs a high port crossflow head.

One of our heads, 254@.050 flat tappet, four barrel in a sedan. Untuned and only second time at the track. Told you it would be fast chestnut.




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Not offended at all and not interested in arguing.  Just providing clarification. There were 3 screen shots of the 3 intake port flow results from the test head if you recall. One was 'stock port window' one was slightly larger than stock and then there was the 'biggest port window' and biggest port. I've not shown a photo of that port at all. 
The 'cotton wool' port was THOR junior which we did after the 3 test ports and went on the speedway engine. Therefore it had stock port window sizing and a 1.86 valve but still went 240 odd.  The crossflow porting thread has a chronological order of events.  

very cool. 

Ok yeah it was funny. The news from Ayr was not so funny tho.  If it's true we are all going to look silly. 

As Rob pointed out, others have tried it and they didn't achieve results as good as the cylinder head in the below flow bench screen shot.

No high port, no massive port window. Just smarts from 2 passionate people. Others have achieved higher flow and good on them.

Reality is that no one will pay for this head. There is only a very small number of enthusiasts who are pursuing making power from these things. If you can do the work yourself - or a prepared to pay the price to someone who can - the sky is the limit







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As Rob pointed out, others have tried it and they didn't achieve results as good as the cylinder head in the below flow bench screen shot.

No high port, no massive port window. Just smarts from 2 passionate people. Others have achieved higher flow and good on them.

Reality is that no one will pay for this head. There is only a very small number of enthusiasts who are pursuing making power from these things. If you can do the work yourself - or a prepared to pay the price to someone who can - the sky is the limit







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Those parts are coming up well. You should try to keep all the pushrods and rockers in the same order as they have worn together. It’s not absolutely necessary but it’s good practice.
I’d crack open the oil pump to clean and lube everything up especially the relief valve. Learn from my mistake of not checking it then blowing off an oil filter then having to rebuild another pump and install it with the engine in the car.

Go buy some decent ezy-outs, you’ll get a few for the cost of some one else removing it. If you do get it moving work it like your cutting a new thread- 1 full turn, back half and so on. Keep soaking it in wd40 as you go.
Good tools maketh the man!

Good gains. Might be his second only x flow head but clearly he is no amateur. At the end of the day they are all just ports and require similar things. If you have a flow bench, time on your hands, some skill and a customer willing to pay for that time - well you will get results. 
Looking forward to seeing how it goes on the car. 

Sounds like you need a good/ different mechanic. 

Good gains. Might be his second only x flow head but clearly he is no amateur. At the end of the day they are all just ports and require similar things. If you have a flow bench, time on your hands, some skill and a customer willing to pay for that time - well you will get results. 
Looking forward to seeing how it goes on the car. 

Sounds like you need a good/ different mechanic.