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valiant64
 Post subject: O/S Valves for 225
PostPosted: Mon Jun 08, 2009 3:11 pm 
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Location: Hi-Desert, CA
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Is there any benefit to running the oversize 1.70 I & 1.44 E valves on a near-stock street 225? The head currently on the engine is stock with no porting, the cam is an Isky solid with 256 dur. & 425 lift, the induction is a Offy 2X1bbl with Holley 1920 carbs, and a Clifford dual outlet header. All else is stock engine & drivetrain wise. Opinions? :?:
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Joshie225
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PostPosted: Mon Jun 08, 2009 3:29 pm 
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Supercharged
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With your mods it makes sense to install larger valve and port the head especially if your valves leak at all or you do not have hardened exhaust valve seats. I warmed up my '67 225 with a ported head cut to achieve a true 8.5:1 compression ratio, 390 Holley on an Offy manifold and 2 1/4" exhaust. Stock cam, stock exhaust manifold. I took over 2 seconds off the 1/4 mile elapsed time.

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Fopar
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PostPosted: Mon Jun 08, 2009 4:43 pm 
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Must remember head was designed for 170 ci motor and wasn't changed with bigger displacement motors. :shock:

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68barracuda
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PostPosted: Tue Jun 09, 2009 10:24 am 
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Turbo Slant 6
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Interesting thing over here

1.7 inch Inlet 1.44 ex available off shelf, correct stem diameter..and installed height........source.....a Turbo Diesel Valve of a Perkins engine

AND they are sodium cooled

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Rust collector
 Post subject:
PostPosted: Tue Jun 09, 2009 10:34 am 
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Turbo Slant 6

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Uh, do you know what perkins engine?
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68barracuda
 Post subject:
PostPosted: Tue Jun 09, 2009 11:43 am 
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Turbo Slant 6
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Will get the info

The sodium cooling might interest the turbo and nitrous gang

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66aCUDA
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PostPosted: Wed Jun 10, 2009 5:55 am 
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We have Perkins engines here its mostly found in farm equipment. Is it the same engines????
Frank

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Rug_Trucker
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PostPosted: Wed Jun 10, 2009 5:59 am 
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Perkins is used in lots of marine applications too.
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slant6 wonder
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PostPosted: Wed Jun 10, 2009 10:27 am 
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Sodium filled valves aren't readily available and are no longer used on heavy-duty and equipment applications to due to the fact they can cause someone grief if regrinding them. They're great for what they do but rarely you find someone working with them. I suggest oversized valves others suggested here would be your best bet.

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