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Joined: Nov 2001
Posts: 19,758 Likes: 63
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 63 |
Jack,
I have been running 386s in my early 6s for many years. Seem to run very well, similar to the AC C-86 plugs. Never tried a back to back comparison. Maybe another case of if it ain't broke, don't need fixin'.
How Sweet the roar of a Chevy four!
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Joined: May 2003
Posts: 360
Backyard Mechanic
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Backyard Mechanic
Joined: May 2003
Posts: 360 |
I recently switched to AC C-87's with a .40 gap on my 1930. It made a material difference. Better pickup, better idle, just better performance.
karl
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Joined: Jan 2010
Posts: 648
Oil Can Mechanic
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Oil Can Mechanic
Joined: Jan 2010
Posts: 648 |
heads up on 3077 autolites. I dont know the full story, something about production or lack there of, which will soon make the 3077's eaither obsolete OR jack the price up from a 6 dallor or so plug to about 12 to 13 bucks a peice. STOCK UP FOLKS!
In my shop, quality is a standard, NOT and option.
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Joined: Jul 2005
Posts: 3,192 Likes: 8
ChatMaster - 3,000
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ChatMaster - 3,000
Joined: Jul 2005
Posts: 3,192 Likes: 8 |
Chipper , Sounds good, I have two sets of new 386's , glad i didnt waste my money.
JACK
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Joined: Dec 2002
Posts: 51
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Dec 2002
Posts: 51 |
I recently purchased a set of AC C-87 plugs for my 30 chev roadster that I am working on and probably will forever. I found that the only way I could install the plugs would be to remove the side cover first. Is this normal? (there may be eneogh room for plug, but not a hope of having eneogh room for the socket.) JFalk
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Joined: Jul 2005
Posts: 3,192 Likes: 8
ChatMaster - 3,000
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ChatMaster - 3,000
Joined: Jul 2005
Posts: 3,192 Likes: 8 |
You might need to grind the outside of the socket down to give extra clearance just for this task.
JACK
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Joined: May 2003
Posts: 360
Backyard Mechanic
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Backyard Mechanic
Joined: May 2003
Posts: 360 |
That doesn't sound right, perhaps you have the wrong side cover. I have a 30 and don't have a problem with the C-87's.
karl
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Joined: Dec 2002
Posts: 51
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Dec 2002
Posts: 51 |
Thanks for the replies. I should have done more research before I posted this note. Found that the head I have on there is not a chev head but I believe it may be an aftermarket or replacement head.The plug hole apears to be about 17/32 and the plug thats in it is an NGK B6S. The C-87 plug apears to fit a hole aprox 11/16 inches. Not sure where exactly I will go from here. Thanks
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Joined: Jan 2002
Posts: 980
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2002
Posts: 980 |
There were several makers of aftermarket cylinder heads, all without the bowtie but all I have ever seen have a standard size C87 plug hole. Some replacement heads used the Chevrolet casting number as their part number.
If you have old Chevrolets, other old Chevrolets will find out where you live.
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Joined: Nov 2001
Posts: 19,758 Likes: 63
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 63 |
17/32" is really 14 mm. The B6S plugs are listed as 14 mm. The plugs in a 1929-32 should be 18 mm. 1933 and later 30s heads have 14 mm plugs. 40s changed to 10 mm plugs for several years.
My conclusion is you have a '33 Master head which will bolt up to a '29-32 block. 1934 and later will not.
How Sweet the roar of a Chevy four!
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Joined: Jan 2002
Posts: 980
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2002
Posts: 980 |
I recently bought a 1933 Master engine with a 1930 head. It had new .060 over pistons but had not been started, probably because there is no pushrod cover that will fit.
If you have old Chevrolets, other old Chevrolets will find out where you live.
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