1970 351c dished piston needed - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-31-2008, 12:03 PM
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1970 351c dished piston needed

Does anyone know of a moderately priced dished piston for a 1970 351c? I'm not building a racing machine but a good everyday driver. I have a 2v in my Ranchero GT but have a good set of 302 Cleveland Aussie heads (58cc) with a Edelbrock Performer 4 into 2v intake and Holley 650 carb. The heads are going to push my compression up to 12/1 without dished pistons. I have a toploader 4-speed to go behind the engine and it has a 3.25 posi in it already. Thanks a million!

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Old 01-01-2009, 11:23 AM
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Assuming you are searching for a 9-9.5:1 pump gas compression ratio, I was only able to find a TRW piston that has an 8cc dish in it. That still is pushing your compression a little too high, unless you have a lot of piston deck hgt. and use a thick head gasket. The key to using a dish piston to lower compression is to still retain a good quench area. I only mentioned TRW, because they seem to be the most economical as are Sealed Power. You might find that KB or others offers some dished pistons as well, but with that small of a chamber, you might find you will have to go custom to obtain a dish the size you need to adjust your compression where you want it....
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Old 01-01-2009, 01:01 PM
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Thanks!

Thanks for the reply. I've searched for TRW dished pistons on the internet but nothing substantial came up. I also found Federal Mogul dished pistons with an 8cc dish and I plan to use .041 thick Felpro composite head gaskets, but that is still going to push me to about 10.25/1. I think I can get Keith Blacks with a 18cc dish but I'm not sure of the application, Cleveland or Windsor. I emailed them but I've got no reply yet. I would really like to find something to put me at 9 or 9.5/1. Thanks for the help.

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Old 01-01-2009, 01:38 PM
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KB148030-8, floating, +13cc D-dish
KB875030-8, Press/Float, +11.7cc dish, Forged
KB881-030-8, P/F, +24cc Dish, Forged
KB879030-8, P/F, +20cc, Dish, Forged
KB877030-8, P/F, +17.5, Dish, Forged
Federal Mogul Z425P, Recessed piston head is 0.080 inch deep x 2.770 inch diameter. Cast, Dish. Also W425p
Not sure what rod length, CR height you're using.
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Old 01-01-2009, 02:42 PM
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Thanks for that!

I plan to leave the bottom end stock, reconditioned rods and all. I'm also hoping that when I yank the engine that the block will need very little overbore. It is a virgin now so if I can get away with a hone job that would be great. Thanks for the Keith Black numbers. I'll run those down. Thanks again.
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Old 01-01-2009, 06:57 PM
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Go to http://www.carbdford.com/index.php?s...46833f3f2aabef Someone over there will have one.
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Old 01-01-2009, 10:13 PM
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look at Probe or srp website. They both have a wide selection of affordable top quality pistons. (summit now carries srp)
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Old 01-02-2009, 08:14 AM
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You might talk to a machinist about using a low compression 400 piston in your Cleveland.
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Old 01-10-2009, 04:17 PM
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Thanks!!!!

All great suggestions, I thank you. I found a set of Keith Black Hypereutectic pistons with a D-cup 13cc dish that is meant for Clevelands with the stock 5.778 inch rods; KB-148. My next question is that their add claims that the 1970 351c had a .020 inch shorter deck height than the 71-74 blocks. All my research says otherwise; all the blocks had the same deck height of 9.206 inches. Which brings me to my second question, does anyone know the exact piston deck clearance? I've calculated it to be exactly .026 inches but I need to make sure before buying pistons and the camshaft. Many thanks for all the great help!!!
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