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Not to be contrary but we have never had head gasket problems, even at 25# of boost (at least not in the 5 years I've been wrenching with Leo). This last season, the head never came off, nor did the engine leak or crack anything, the valve train is just fine, as it always has been. Yes, this is not for the faint of heart but there are no problems that can't be overcome. Yes, there are better choices for the head but you pick the head to do the job at hand. An awfully lot of it depends simply on the fabrication of components, good machining and assembly techniques. Don't machine where it will weaken the block or expect silicon to bridge a quarter inch gap. Simple stuff. I was under the impression that you guys only use 10 PSI of boost pressure? Yes, no? MBHD
12 port SDS EFI 
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Just a note - for the cost of a hybird head + $800 one could get a 4200 vortec ($500 on ebay)- add race cams ($1200 - 1400),headers and an intake make 500HP all day long and not have the headache of trying to keep a hybird head sealed....
What would you estimate the total cost to be on this 500hp setup? What would you estimate the cost to be if using a stock 4200 minus the smog stuff? Do you need a tranny adapter to use an older transmission (t5 maybe)?
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Headers $1500-2000 Intake $1000-$1500?
500 HP all day long,we need some evidence of a low dollar 4.2 that can make 500 HP all day long,not saying it can't be done,but I have not seen anyone doing it,have anyone else?
MBHD
12 port SDS EFI
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Headers $1500-2000 Intake $1000-$1500?
500 HP all day long,we need some evidence of a low dollar 4.2 that can make 500 HP all day long,not saying it can't be done,but I have not seen anyone doing it,have anyone else?
MBHD I would have to second that! The prices for the intake and headers sounds like race car prices. It still needs a good set of carbs and ignition and that's $3000.00 and so on. How much compression? BTW-HANK did you get the pics I sent?
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Joined: Sep 2004
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Yes Mighty6
I got the pics,looks great & thank you.
MBHD
12 port SDS EFI
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Joined: Jun 2005
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Headers $1500-2000 Intake $1000-$1500?
500 HP all day long,we need some evidence of a low dollar 4.2 that can make 500 HP all day long,not saying it can't be done,but I have not seen anyone doing it,have anyone else?
MBHD I'd be happy with 200-300 in my daily...
Last edited by 63ChevyII; 06/24/08 05:32 PM.
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The 4.2 is a GREAT inline engine. I think the point efi-diy was trying to make it that in terms of extracting huge power from an inline six there are cheaper and simpler ways of doing it than trying to mate a hybrid head to an antiquated short block. As for the potential of the 4.2 six, do a google on the likes of "Glen Treadwell", "Jerry Arnold", "Brian Self", and others who have switched to the 4.2. Granted, their seven-second race motors have more than bolt-on parts done to them, but efi-diy is correct in implying that HP for HP dollar, there are better alternatives to a hybrid-headed six. And one of them is the 4.2. If they are legal in your dirt modified I would look into it.
Otherwise look at a 300 Ford.
Last edited by THE FRENCHTOWN FLYER; 07/02/08 12:37 PM.
FORD 300 inline six - THE BEST KEPT SECRET IN DRAG RACING!
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It seems many guys in Brazil are making a lot of HP with there 250's & 292 inlines with the standard siamesed port cylinder head.
Boosted & making anywhere from 1000 HP to 1250 HP.
Stock crank,stock main caps,no main girdle & so-on.
Seems like they should just blow apart,but I think with these HP figures the stock bottom end is pretty stout for what it is.
Sure, you can improve them with aftermarket stuff.
Douglas is looking to get 1400 HP out of his 250 CI inline & set a new record,,,, for ET & HP,,,go Douglas go!!!
MBHD
12 port SDS EFI
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I really enjoyed the dialogue here. In regards to performance I have moved two steps forward and then one step back since I jumped into the Inline World with my decision and consequent purchase of a late 250 Chevy inline.
Since then I have had more than a few conversations with you guys in respect to bringing the HP and Torque to a live-able level. My LiL 65 Nova will most likely not get much track time but when I am done and thanks to many of you, it will be a respectable car to drive enthusiastically.
Thanks guy for both keeping me informed and providing a few chuckles.
James
James Kuenzi
Mid Missouri
64 Dodge Dart GT Convertible
225 /6 w 5speed
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