o where, o where?
Thread Starter
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Fleet Mechanic
Joined: Nov 2007
Posts: 1,765
Likes: 29
From: Northeast Nebraska
o where, o where?
so, i read on here and heard thru the grapevine that if i put a head off of a 240 on my 300, that'll bump up my compression, but where the heck do i find one of these, most people i talk to about it have heard of this technique and heard of the engines, but don't kno where to find them...i tried looking thru evilbay and in the local junk yards but nothin nowhere...anyone out there kno something i don't?
Elder User
Joined: Jul 2003
Posts: 997
Likes: 0
From: Weston, Nebraska
Here I was coming to this forum to post something about cc's on a 300 head and this looks like just the subject for it. I was home from work today and killing time on the internet and tried to find the the cc's on a 300 head. I am building a 460 for my pulling truck and it seems easy enough to find those numbers, but I couldn't seem to dig up anything on the 300 head.
Now I have heard the same thing as you Snowman and I believe it's b/c of the smaller cc's on the 240 head, another thing I heard is that the 240 head is also more restrictive in flow then the 300. So if someone could find the cc's on both these heads we could figure up the compression ratio on both and see how much of a difference it really makes.
Now I have heard the same thing as you Snowman and I believe it's b/c of the smaller cc's on the 240 head, another thing I heard is that the 240 head is also more restrictive in flow then the 300. So if someone could find the cc's on both these heads we could figure up the compression ratio on both and see how much of a difference it really makes.
Thread Starter
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Fleet Mechanic
Joined: Nov 2007
Posts: 1,765
Likes: 29
From: Northeast Nebraska
well hello there cowboy, been meaning to email u, but haven't had anything worth sendin u...haven't been around that engine to get any numbers off of it, but as soon as i do, u'll be the first to kno! but ya, as they say, great minds think alike!
Elder User
Joined: Jul 2003
Posts: 997
Likes: 0
From: Weston, Nebraska
Ahhh, like I said, no hurry, no use going out in this weather. When I take the 460 to the machine shop maybe I'll ask my guy if I can borrow his cumbustion chamber volume checker (can't think of the proper name) and check my old head off my 300 (one of the chambers that doesn't leak) my old head had hairline spilts all the way through the valve seats and a 1/4" more in 2 cyl.
Postmaster
Joined: May 2002
Posts: 3,241
Likes: 3
From: Broken Arrow, OK
You can also use the 4.9 EFI head. It has a small chamber like the 240, but the flow is not reduced. You will need to recurve your distributor to make it work right. The EFI head should be much easier to find than the 240.
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Elder User
Joined: Jul 2003
Posts: 997
Likes: 0
From: Weston, Nebraska
Silver Streak, you don't happen to know the numbers on the 240, adjustable valve 300, non-adjustable 300 and the EFI do you?
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Thread Starter
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Fleet Mechanic
Joined: Nov 2007
Posts: 1,765
Likes: 29
From: Northeast Nebraska
can i still use my carb setup w/ the EFI head or do i need to switch to a complete EFI setup and if yes, then that would mean getting an engine computer among other things?