Ford 300 Pistons question
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
Ford 300 Pistons question
Hey everyone:
A couple of you guys told me about a Fed Pro/speed pro piston#H519P, because it has or is rated as 8.5:1 compression.
Now if ford made I think three different heads for the 300, how could you know the compression without measuring the cc in the head?
And also, I found that piston at Summitt Racing, but didn't buy it because it was so cheap!! for a hypereutectic piston, they had a set of six for under $13.00 per piston. Could that be right?
Of course I would love to save some cash, but I was concerned about quality for that price. What do you think?
A couple of you guys told me about a Fed Pro/speed pro piston#H519P, because it has or is rated as 8.5:1 compression.
Now if ford made I think three different heads for the 300, how could you know the compression without measuring the cc in the head?
And also, I found that piston at Summitt Racing, but didn't buy it because it was so cheap!! for a hypereutectic piston, they had a set of six for under $13.00 per piston. Could that be right?
Of course I would love to save some cash, but I was concerned about quality for that price. What do you think?
Posting Guru
Joined: Sep 2004
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if you dont have any real compression ratio target, then it really wont matter.
if you want to really achieve X compression ratio, then your machinist will have to measure the block and cc the head, just no way around it. There were loose tolerances and likely, your compression ratio, if you just guess, will be alot lower than you had hoped but if you dont care, then that wont matter either.
if you want to really achieve X compression ratio, then your machinist will have to measure the block and cc the head, just no way around it. There were loose tolerances and likely, your compression ratio, if you just guess, will be alot lower than you had hoped but if you dont care, then that wont matter either.
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
cc head
Motorhead351:
When you say cc the head, what does that mean? Are we talking shaving the surface to create a small combustion chamber? Or actually modifying the chamber itself?
When you say cc the head, what does that mean? Are we talking shaving the surface to create a small combustion chamber? Or actually modifying the chamber itself?
Postmaster
Joined: Dec 2006
Posts: 3,603
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From: Spokane, WA
cc'ing the head is a measurement of the combustion chamber volume. When you get in to that stuff it's best to be advised by a machinist. Only two heads that make a difference...carbed and EFI. One can gain about .5 in compression by using the 240 head. Tell your machinist what you want for cr and leave it to him. I told mine 8.5-9.0 with a maximum of 9.0. Came in at 8.6 when the job was done.
Nothing wrong with those pistons. Hypers are a step up from bone stock pistons which are a weak part of the 300. Summit also lists that piston with a coated skirt (CP designation in the PN I think) which is the ones my builder used.
Nothing wrong with those pistons. Hypers are a step up from bone stock pistons which are a weak part of the 300. Summit also lists that piston with a coated skirt (CP designation in the PN I think) which is the ones my builder used.
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