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Farmall & IHC Tractors Discussion Forum
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HEAD FOR 123 C. I. DIFF. VAVLE LENTHS ????? HELP..

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COPPER KAT

03-29-2007 11:48:37




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I WOULD LIKE KNOW IF CAN PUT TISCO FLAT TOP OVERBORE PISTONS 3.125 IN MY 113 C.I. AND USE 123 C.I. HESD PART # 251172R2, I WAS TOLD THERE ARE TWO VALVE LENGHTS 4 7/8 AND 5 1/4 IN. USED IN THIS HEAD. CAN ANYONE TELL ME WHITCH ONE IS CORRECT FOR THIS APLICATION. THANKS FOR ANY HELP.....




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gene bender

03-29-2007 16:41:01




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 Re: HEAD FOR 123 C. I. DIFF. VAVLE LENTHS ????? HE in reply to COPPER KAT, 03-29-2007 11:48:37  
Your cam will determine how much the valves will open if you use the same rockers



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Janicholson

03-29-2007 13:37:39




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 Re: HEAD FOR 123 C. I. DIFF. VAVLE LENTHS ????? HE in reply to COPPER KAT, 03-29-2007 11:48:37  
Other than the flat topped pistons in early McCormick products that actually protrude above the block deck, (reciently discovered info on this site) All IH heads will not hit the valves with flat top pistons. I would use fire crater pistond to improve the power. There have been no issues with those into the valves (unless a radically ground cam, or high ratio rockers are used. The valves must be the correct length for the head. Dual fuel, Gasoline/distillate, heads are short valve heads. (I think, but do not know if all others take the same longer valves. Gasoline only heads have compression advantages and should be used if possible. JimN

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