Piston Differences
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Joined: Dec 2007
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From: Boise, Idaho
Piston Differences
I was looking up different pistons available for the 300 and noticed quite a few sets with flattop pistons, but they usually say they fit from 65 - 76.
Such as:
FORD FALCON F150 E100 300 4.9 240 PISTONS TC1795 .040 - eBay (item 370307730150 end time Mar-11-11 10:32:47 PST)
What changed that would make these not work in a newer engine?
Such as:
FORD FALCON F150 E100 300 4.9 240 PISTONS TC1795 .040 - eBay (item 370307730150 end time Mar-11-11 10:32:47 PST)
What changed that would make these not work in a newer engine?
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Joined: Dec 2007
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From: Boise, Idaho
It said it was for the 240 and the 300.
So is there different things you can do? Get 70s era rods so the pins match? Dunno. Just think it'd be an easy way to score flat top pistons and get some compression. Who knows, maybe I'm way off base.
So is there different things you can do? Get 70s era rods so the pins match? Dunno. Just think it'd be an easy way to score flat top pistons and get some compression. Who knows, maybe I'm way off base.
Postmaster
Joined: Mar 2005
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From: Earth
The pin size on those is correct, but if they'll work in a 240 the compression height has to be ~1.5" vs. ~1.75" on the stock 300 piston.
There are plenty of 351w flat tops with the right compression height, no worries, just have the rods bushed.
There are plenty of 351w flat tops with the right compression height, no worries, just have the rods bushed.
Lead Driver
Joined: Mar 2008
Posts: 7,165
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From: Near Los Angeles
I'm curious. I checked on Summit, and it shows the same pin diameter on all years. But that doesn't mean I'm wrong.
I just remember reading on fordsix someone asking about old style rods.
I just remember reading on fordsix someone asking about old style rods.
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Postmaster
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From: Earth
Basically a sleeve inside the rod that reduces the i.d. from .975" to .912", any decent machine shop should be able to do it.
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From: Boise, Idaho
Speed Pro ZH519P - Speed-Pro Hypereutectic Pistons - Overview - SummitRacing.com
I'm curious too, because those say the pin size is 0.975, just like the flat top ones in the listing above.
That makes sense, and sounds easy enough.
I'm curious too, because those say the pin size is 0.975, just like the flat top ones in the listing above.
Basically a sleeve inside the rod that reduces the i.d. from .975" to .912", any decent machine shop should be able to do it.
Tuned
Joined: Oct 2004
Posts: 288
Likes: 7
From: Denver, Co
I have heard oversize 390 pistons are the way to go - but require re-ballancing - which would be a requirement anyway IMO. - I was just researching now - I'll check back.....
I have a 94 FI 4.9 that I'd like to raise compression and a mild RV cam. And change over to the ZF 5-spd tranny.
and a tweek to the ECM
I have a 94 FI 4.9 that I'd like to raise compression and a mild RV cam. And change over to the ZF 5-spd tranny.
and a tweek to the ECM
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
I have 360 pistons in mine, no rebalancing required, no pin bushing required. It really runs quite well. Just need to bore to a minimum of .050 over, I have mine at .080 with no issues, even in 98degree weather last summer.
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