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350/300 OR 350/350 - How do I tell?

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Old 06-25-2010, 10:40 AM
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VancouverMark
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Default 350/300 OR 350/350 - How do I tell?

Just wondering how do I tell which motor I have? I found an old console spec plate that has 350/350, but the current one on the console is 350/300. Any ideas how I find out? Apparently I have a #'s matching car, which I will check this weekend.

Cheers
M
Old 06-25-2010, 11:22 AM
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garage-ghost
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Check the flat surface right in front of the passenger valve cover for a two letter code.

HZ or HY = 350-300HP

HX, HW, GD, GC = 350-350HP
Old 06-25-2010, 11:58 AM
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VancouverMark
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Thanks! I'll have a look this weekend.
Old 06-26-2010, 03:26 AM
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JW3101
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In addition to the codes, the 350/300 is supposed to have engine color valve covers and the 350/350 is supposed to have steel ribbed covers.

Proper 350/350 valve covers but painted engine color (before)


350/350 valve covers blasted and powder coating (after)

Last edited by JW3101; 06-26-2010 at 03:32 AM.
Old 08-18-2018, 11:15 PM
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Davejordan
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What engine codes are on the block in front of the passengers side valve cover? Does it have the removable rear window? How bad are the fiberglass issues?
Old 08-19-2018, 01:00 AM
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Iceaxe
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Originally Posted by JW3101
In addition to the codes, the 350/300 is supposed to have engine color valve covers and the 350/350 is supposed to have steel ribbed covers.

The L-46 (350/350) has aluminum valve covers, often referred to as LT-1 valve covers.

An L-46 will also has a 6000 rpm redline tach. When faking an L-46 the tach is seldom changed as its a PITA to do.

Swapping out the console tag is the easiest method of adding 50hp to a base engine corvette :-)

Adding the LT-1 valve covers to any SBC has always been a popular option.
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Last edited by Iceaxe; 08-19-2018 at 01:10 AM.

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