Best pistons
Thread Starter
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Tuned
Joined: Sep 2003
Posts: 257
Likes: 1
From: Wildwood
Best pistons
Hey guys,
I am about to do a rebuild on a tired 95 EFI and need to know what the best replacement piston would be. I pretty much have the rest of it nailed down. I am trying to find out what stock piston will yield the highest reasonable compression ratio. I have looked at a few manufacturers sites and figured I would also ask everyone here to see if there was a certain favorite. So far I am leaning towards a Sealed power H519P from summit. It might not be that critical seeing that the block and head are both going to have .020 removed to clean things up. Input from anyone with experience would be greatly appreciated. Thanks.
I am about to do a rebuild on a tired 95 EFI and need to know what the best replacement piston would be. I pretty much have the rest of it nailed down. I am trying to find out what stock piston will yield the highest reasonable compression ratio. I have looked at a few manufacturers sites and figured I would also ask everyone here to see if there was a certain favorite. So far I am leaning towards a Sealed power H519P from summit. It might not be that critical seeing that the block and head are both going to have .020 removed to clean things up. Input from anyone with experience would be greatly appreciated. Thanks.
Lead Driver
Joined: Mar 2008
Posts: 7,193
Likes: 387
From: Near Los Angeles
That is a good piston, the one I have. It is rated at 8.7:1, and with the .040 off it will bump your compression a little higher. I believe there is the same piston, only with the special coating on the skirts. I believe it is called 'durasheild' IIRC.
Thread Starter
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Tuned
Joined: Sep 2003
Posts: 257
Likes: 1
From: Wildwood
Thanks F-250, Glad to hear someone else has some experience with this piston. I would have thought more members would know what piston is in their rebuild. Seems like a good place to make improvements if you are that deep into it. I think it should get my compression where I want it while not creating any major problems.
Lead Driver
Joined: Mar 2008
Posts: 7,193
Likes: 387
From: Near Los Angeles
Take a look at the Keith Black pistons on Summit too. IIRC they smaller recess pistons, and I believe one with a flat top. But don't guess. Go to one of the sites that help you calculate the cr, and know for certain.
Thread Starter
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Tuned
Joined: Sep 2003
Posts: 257
Likes: 1
From: Wildwood
The recess volume is the question. I know a stock flattop exists, but the compression height is not the same and actually yields a 7:1 compression for a different application. I guess what i am trying to find out is what stock piston with a 1.767 compression height has the lowest dish volume. A true flattop creates an unstreetable C.R.
Lead Driver
Joined: Mar 2008
Posts: 7,193
Likes: 387
From: Near Los Angeles
I believe the Keith Black 3118H is what you are looking for. CR is something that can be changed by decking the block/and/or milling the head. Installing the head from a 240 is also a popular means to boost cr by a half point. I used the Fed. Mog. zh519p30, and decked block and shaved head to get where I wanted to be. If you are willing to go the extra mile with machine work, many guys use the 352 pistons, 350 chevy, or, by boring the cylinders .050 over, they install 390 pistons. Note: a nice set of sb forged pistons can be had for about $200. Making them very appealing.
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Thread Starter
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Tuned
Joined: Sep 2003
Posts: 257
Likes: 1
From: Wildwood
I think that is exactly what I am looking for. It shows it as a stock heavy duty replacement for engines up to 92. What changed from then to 95? They still used the same head. Why change piston specs? The only thing that makes sense is to conform to tightening emission regulations I guess.
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