C9VE vs. D3VE
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From: I live in a warehouse in
C9VE vs. D3VE
I've got some D3ve's on my 460. Just wondering if it's worth it to switch to C9ve's which I can get from the boneyard around here? I wanted to increase compression a tad. Thanks
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Joined: Dec 2003
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From: iowa
is it worth it? thats kinda vague if you can get the C9 heads for a cheap price maybe. Problem is everyone has decided the early heads are worth SSSOOOO much more and ask stupid prices for them. The will raise your compression a little over 1 full point.
I guess a question back is are you rebuilding the engine or just wanting an easy way to up the compression without rebuilding it?
I guess a question back is are you rebuilding the engine or just wanting an easy way to up the compression without rebuilding it?
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From: I live in a warehouse in
I had noticed that on the cost of the heads. I wasn't going to rebuild any, just the '71 timing chain and cam as long as the heads were off. I need to rebuild the stock 4 barrel carb and thought I might be able to pick up some mpg with my new exhaust and thought maybe the C9's would help some. Just wondering. . . my engine runs good, and i'm getting 10 mpg with the D3 heads. Would I see any real improvement with the C9's on a daily driver?
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Joined: Dec 2003
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From: iowa
no you wouldn't see any improvement in mileage to speak of. You could have the D3 heads shaved about .030 this will bring you up about 1/4 point of compression. the reason I was asking about rebuilding was I would have said to have the block square decked, adn bring the pistons up close to zero deck and gain some that way.
And what do you mean by "as long as the heads are off" you didn't mention anything that requires the removal of the heads so are you doing something to them while your at this or why are you removing them if the engine is running strong, just wondering is all.
And what do you mean by "as long as the heads are off" you didn't mention anything that requires the removal of the heads so are you doing something to them while your at this or why are you removing them if the engine is running strong, just wondering is all.
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From: I live in a warehouse in
The heads aren't off, I've just been reading stuff here in this forum. Normally I stay in the '67-'72 forum. The PO dropped a 460 in my '69, and I was just looking for things to do. I had read about switching to a pre '73 timing chain and cam change (specifically '71, to increase compression) and thought that while the carb was off, and since I'm doing exhaust manifolds, that maybe I should switch heads, throw on some headers, and rebuild exhaust from there. Headers have to wait a month or two due to cost and the fact that I still can't get a definitive answer as to which headers fit on my truck. I'm putting stock manifolds on, and then going to sidepipes to route past the rear gas tank and side tool box which are in and under my bed. I've got to replace the cracked stock manifold on passenger side, 'cuz I've got to pass emissions, asap, since this is my daily driver. After I pass, I was thinking about changing heads, adding headers, etc. I'd love to add some neck-snapping acceleration while I'm in there doing the other stuff, but I'll settle for strong-running and reliable. Any thoughts. . .?
Cargo Master
Joined: Dec 2003
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From: Sunny Florida
My bet is the MPG will go down with the C9 heads due to the slightly larger valves than the D3 heads and I think the ports are slightlt bigger as well and both of these things only mean the rpm range needs to move upward to make more power and torque. To get the best mpg you need to make the power and torque lower in the rpm range not in the upper rpm range.
The 71 timing chain does not raise the compression of the motor, it only changes your valve timing or advances it.
The 71 timing chain does not raise the compression of the motor, it only changes your valve timing or advances it.
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From: PacNW
C9VE heads don't have larger valves than the D3s. The only difference is the size of the combustion chambers.
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Cargo Master
Joined: Dec 2003
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From: Sunny Florida
Not sure where I heard or read that but I guess I was wrong on the larger valve sizes. I know for sure Ford did change the valve size in the 460 heads but I am not sure which year that took place.
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From: PacNW
CJs, SCJs & early Police heads had 2.24/1.725 I/E valves with a 73.5 cc comb. chamber. In 73 the Police heads went to 2.19/1.66" valves in an 89 cc comb. chamber. Other than those specific castings all 429/460 heads had 2.08/1.66 I/E valves. The combustion chamber size did change from 75.8 cc to 91.4 in 1972 then to 96.2 in 1975.
Cargo Master
Joined: Dec 2003
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From: Sunny Florida
As always there seems to be many different ideas of whats what. I did some searching and yes all car heads had the same valve size. Not sure why I thought they changed the valve sizes but they didn't.
This is also the first time that I've heard that the PI heads came in different valve sizes. I also thought all PI heads started with D2OE but the link I found mentions that there was a D3AE PI head.
Here's the link http://www.reincarnation-automotive....s-1-index.html
This is also the first time that I've heard that the PI heads came in different valve sizes. I also thought all PI heads started with D2OE but the link I found mentions that there was a D3AE PI head.
Here's the link http://www.reincarnation-automotive....s-1-index.html
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