3904391 head on ebay

[Joe R.]

As I mentioned before, my '66 L72 car came with '67 3904391 heads. One dated G96 (July 9, 1966), the other D17 (April 1, 1967). I tried to sell them in the Driveline as a set. No dice, maybe because the dates are nine months apart. So I've been looking for two singles that match mine to make up two pairs. I found this one on fleabay:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=110505046236&ssPageName=STRK:MEWAX:IT

I think it may have oversize exhaust valves installed in it (2.19 intake 1.88 exhaust) according to this:

https://www.forums.ncrs.org/showthre...04391&uid=1605

What size valves originally came with the L71?

Thanks,
Joe

[Joe L.]

Re: 3904391 head on ebay

As I mentioned before, my '66 L72 car came with '67 3904391 heads. One dated G96 (July 9, 1966), the other D17 (April 1, 1967). I tried to sell them in the Driveline as a set. No dice, maybe because the dates are nine months apart. So I've been looking for two singles that match mine to make up two pairs. I found this one on fleabay:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=110505046236&ssPageName=STRK:MEWAX:IT

I think it may have oversize exhaust valves installed in it (2.19 intake 1.88 exhaust) according to this:

https://www.forums.ncrs.org/showthre...04391&uid=1605

What size valves originally came with the L71?

Thanks,
Joe

Joe-------



2.19" intake and 1.72" exhaust. So, it would appear that only the exhaust size has been increased. This would not cause any problems and no one would ever know the difference. 1969 L-88 and ZL-1 with open chamber heads used the 2.19/1.88" valve sizes as well as all other 1970-71 SHP big blocks, Corvette and non-Corvette, with cast iron or aluminum heads (i.e. L-78 and LS-6)

[Mike G.]

Re: 3904391 head on ebay

looks like a good part at a good price. i would buy it if i needed one. i sold a matched a15 set last year for $3500. only thing to be carefull about is the fact it has never been fluxed. will he guarantee no cracks?

[Joe R.]

Re: 3904391 head on ebay

Joe-------



2.19" intake and 1.72" exhaust. So, it would appear that only the exhaust size has been increased. This would not cause any problems and no one would ever know the difference. 1969 L-88 and ZL-1 with open chamber heads used the 2.19/1.88" valve sizes as well as all other 1970-71 SHP big blocks, Corvette and non-Corvette, with cast iron or aluminum heads (i.e. L-78 and LS-6)

Joe,

Thanks very much for the info. The only problem is that I'm pretty sure the mismatched heads I have are 2.19 " intake and 1.72 " exhaust.

Joe

[Joe R.]

Re: 3904391 head on ebay

looks like a good part at a good price. i would buy it if i needed one. i sold a matched a15 set last year for $3500. only thing to be carefull about is the fact it has never been fluxed. will he guarantee no cracks?

Mike,

Yes, if the price holds that would be a very good price indeed. He did not say he would guarantee no cracks. But the good news is that he is taking it to a machine shop to have it magnafluxed.

Joe