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Old 02-19-2003, 02:38   #1 (permalink)
Chasing 500rwkw
 
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Cylinder Heads and LPG

I have an alloy head on my 250 xflow and need to know if i need to do anything to the head to run it on LPG??
Will i need new valve seats?
Will it be fine as is?

It has had a stage 3 going over by COME racing and has larger valves and porting etc etc.

Also when converting to straight gas should i use the EFI manifold or use the redline that i already have.
This will turn into a straight gas turbo car by the end of the year.
If i use the EFI what do i do about the injectors.

Thanks Again
Dan
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Old 02-19-2003, 04:20   #2 (permalink)
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If it is an unleaded head I wouldnt do anything to the head at this time, I am not sure but a unlead head is most likely to have better valves because of the lack of lead in the fuel that is used for lubrication.

EFI intake would be a much better manifold for gas than the redline, u will most probably get better torque at lower rpm as well.

either block the injector holes or leave them in there
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Old 02-19-2003, 13:06   #3 (permalink)
Chasing 500rwkw
 
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Sweet thanks for the info. It is an unleaded head.
If it was straight gas i wouldnt need the computer or any sensors would i?
When the block gets switched later in the year ill get the head serviced and stellite valve seats put in place for that extra security.

Thanks again.
Dan
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Old 02-20-2003, 01:58   #4 (permalink)
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yeah EFI intake sounds good!

as above, plug the injector holes and no worries.

get rid of the factory inlet piping though and run a pipe to the front of the car with a pod on the end, you will have heaps more space in the engine bay.

damn you people with boost - i want some!!!!!!
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Old 07-18-2003, 05:52   #5 (permalink)
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If you have some money to spend on the LPG setup, live in melbourne and want over 130rwkw give the guys @ LP GAS 1 a call, they are in Lilydale Vic and have a setup involving a later model EFI manifold which makes a Ton of power. I am switching over to straight LPG on my 6 but i'm really not interested in spending any more than I have to, i need to focus my funds on the 351!

I'm going to keep the redline manifold and chuck on an impco 425 straight LPG carby with a 1" spacer and a 600 holley base. I'm also getting a custom wade cam and new lifters. While the engine is out i'll also put a bigger oil pan with windage tray, crank scraper, etc on it. I'm hoping for 160-170HP but more importantly I want to hit 15.30 down the strip. Ran 15.63 @ 87mph at calder tonight, but there is not much more left in the current setup (possibly a bit left in the driver however )
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Last edited by xdc351; 07-18-2003 at 19:33.
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