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#1
12-25-2005, 12:21 AM
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3880492 small block heads
3880492 Any body have any idea what theese heads would be off of I was told the casting date was W273 I questioned the daste but thats what he claims it is. They have the small double humps like the Z28 186 heads have and also the accessory bolt hole, they are not angle plug heads. thanks
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69 RS SS L78 conv 69 RS SS ZL1 69 L78 Chevelle conv 69 L78 Nova 69 L34 Nova 67 SS Chevelle 73 Trans Am 
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#2
12-25-2005, 01:51 AM
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Re: 3880492 small block heads
They are over_the_counter EXACT replacements for the 186 heads. There is absolutely no *visual* difference that I have seen. Mostly available after mid year '70 and on... I do know some dealers used these if they couldn't get 186 heads, for any GM warranty situations. HTH.
www.mortec.com Jim
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aka - Mighty Mouse
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#3
12-25-2005, 02:23 AM
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Re: 3880492 small block heads
Jim are you thinking 3991492s? I can't decode 3880492 to anything in my references. The common 3991492 would be the over the counter replacement heads available after 1970. They came in different valve sizes as well as straight or angle. John that number has got me lost. Is the head cast with "GM"?
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1969 Z28 1972 Corvette
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#4
12-25-2005, 02:30 AM
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Re: 3880492 small block heads
Darren, you are correct, brain fart.....wasn't paying attention in class... but I do have a few 3991492's around here
Jim
__________________
aka - Mighty Mouse
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