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Old 09-07-2011, 07:10 AM   #1
jetmek
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Default oversize intake valve

does anyone have a part no. or application for a suitable o/s valve and seat? i did a search and found gmc 305 listed but they arent much bigger than stock. ive also seen 1.7 mentioned but no number for it . will a 1.7 clear the gasket and head? any help is appreciated....
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Old 09-07-2011, 07:13 AM   #2
CA Victoria
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Default Re: oversize intake valve

http://modelaparts.net/index.html
Piranion's in Texas sells the large valves individually and as a compete valvetrain.
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Old 09-07-2011, 08:06 AM   #3
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Default Re: oversize intake valve

As CA Victoria said Piranoi's sells the 1.70" oversize valves and Charlie Yapp usd to sell a set that was 1.73" dia (Is Yapp still in business). I have used both sizes from both suppliers with no problems. Your block will have to be bored to accept he larger valves, But not a big job to an engine builder with the right equipment.
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Old 09-07-2011, 08:29 AM   #4
Kurt in NJ
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Default Re: oversize intake valve

http://www.antiqueenginerebuilding.com/valves.htm

I also know of a Volvo turbo diesel truck intake valve that is a little over 1.6 with a 30 degree face that is very close to direct fit in original guides from an 80s 6 cyl
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Old 09-07-2011, 09:40 AM   #5
Purdy Swoft
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Default Re: oversize intake valve

The GMC V6 valves from the late sixties can be used. I think it is the small 305 V6 that will work. The best that I remember the head of the valve is about .060 larger than model A . Unless the seats are cracked you won't need to replace them. When you cut the original seats larger you reach better metal and you don't run the risk of replacement seats giving problems, such as lifting out of the block. I don't know all of the details. I had a set installed at a speed shop in one of my engines several years ago before I had any of the special tools to do my own valve work. Larger valves seem to increase the rpm range.
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Old 09-07-2011, 09:53 AM   #6
Jim Brierley
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Default Re: oversize intake valve

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Yes, it is the 305 CID V6 engine (light duty is best) from the early 60's. It is a great replacement valve for the A but is not large enough to make a difference in power. I use them regularly, both as intakes and exhausts. They are slightly longer but usually fit in easily, sometimes a little must be taken off the stem. I've used 216 Chevy valves as intakes, bigger but I don't remember the head diameter, easy to install, not cheap.
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Old 09-07-2011, 10:05 AM   #7
Benson
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Default Re: oversize intake valve

Note: If larger valves are used some heads must be modified to clear the valves. The Lion Head III is one for sure.

The new version Lion Head, when it comes out is supposed to be modified to clear a larger valve.

http://www.secretsofspeed.com/LION.htm

for additional info on size of valves.
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Old 09-07-2011, 10:07 AM   #8
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Default Re: oversize intake valve

So, is this where this jingle comes from?

"Built Ford Tough with Chevy Stuff"
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Old 09-07-2011, 10:16 AM   #9
jetmek
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Default Re: oversize intake valve

thanks all...chevy 2,2l valves look like a close match but need a slightly longer lifter mite be worth looking into...
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