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Discussion Starter #1
Sending my heads to the machine shop in the next week or so. What is everyones opinion on putting hardened seats in? Are the really needed? Do you do both or just exhaust? The engine will have SS valves, 4v quenched heads and be a weekend driver during the summer. Comp is 11.0 :1. The valve seats are in great shape (not recessed, first valve job)

Mark Memmer
70 Calypso Coral Mach 1 351C 4V Completed by 8/01
98 Cobra Convertible
93 5.0 Mustang LX (Winter Ride)
00 Volvo S80 (Wifes Ride)
 

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If your gonna keep the car and drive it alot,,put them in(exhaust side)If you trade alot or will drive it like a couple hundred miles a year it isn't required,,just keep in mind you'll never be closer than you are now to doing it ,,I do it to all mine when rebuilding just to not have to worry about goin from occassional driver to daily driver status

Robbie
 
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Personally, I wouldn't worry about hardened exhaust seats unless they are worn. I would be more concerned if your valves are the multi-groove type.
 
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What type of cam are you currently using or going to use. If your using a mech cam have the shop put proper ARP or similar screw in studs. I wouldn't recommend the conversion kit with the small 5/16 bottom and 7/16 top.
 

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I'll throw in my $.02 for what it's worth. I'm not going to fool you ( good thing it's not yesterday ) and tell you I'm an expert on the subject or an engine builder, I'm not. Back in the mid eighties I did a lot of reading on the subject, mostly out of curiousity. What seemed to surface was that, unless the engine was running under heavy loads all the time, such as a truck, it's not too much of an issue. Infact the lack of lead will actually prolong engine life with reduced wear. A while back, while thumbing threw a magazine on the news stand, there was an article on building up an early Chrysler Hemi, the builder said the heads were hard enough and didn't need hardened seats and never saw any problems in past engines he built ( Hemi's ) with unleaded gas. He did use s.s. valves.

Now in saying that, If it were me, I'd ask the builder anyway and if it's not too expensive to do, why not. Since you're running a high compression, I take it, that your engine is going to be on the radical side. Think about it, you'll probably have the engine apart to freshen it up way before wear from the unleaded gas show up and have the seats tuned up while the engine is apart. You wouldn't do a ring, bearing and valve springs with out touching the seats, would you?

Tom
You can do anything you want to......ONCE!
aka "my 66 coupe"


Hale Boppe comet shot off my roof. See you can use 100 iso at night with no flash!
 

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Discussion Starter #6
I changed the valves to single groove and have 7/16 studs ready for installation. Cam specs are Crane roller cam: In Dur 228 at 050, .597 Lift, Ex Dur 232 at 050, 609 lift. Deg lobe sep 112

Mark Memmer
70 Calypso Coral Mach 1 351C 4V Completed by 8/01
98 Cobra Convertible
93 5.0 Mustang LX (Winter Ride)
00 Volvo S80 (Wifes Ride)
 
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Niiiiiiiiiiiiiiiiiiice!

What oil mods have you done?
<P ID="edit"><FONT SIZE=-1>Edited by 1970coupe on 04/02/01 09:25 AM (server time).</FONT></P>
 

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Discussion Starter #8
Windage tray, baffled oil pan, Melling HV pump, chamfered passages, and am looking into the oil rerouting hose for the mains. No too sure about it yet. Not into restrictors...Robbing Paul to pay Peter....

Mark Memmer
70 Calypso Coral Mach 1 351C 4V Completed by 8/01
98 Cobra Convertible
93 5.0 Mustang LX (Winter Ride)
00 Volvo S80 (Wifes Ride)
 

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Getting my 351C rebuilt too, I've done alot of reading on it so far and have asked many an engine builder. The shop I'm dealing with says unless I'm going to drive the hell out of the car all the time and rev the ____! out of it then hardened seats are not needed. He also told me that unless I'm pushing the motor to 6500-7000 rpm's that the valve keepers won't give me any problems... let me know what you decide on
 
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Your not really "robbing Peter to pay Paul on a Cleveland. It was just a poor design. The left lifter valley holds too much oil and passes too much though. You dont' need all that oil in the top of the engine...and you *especially* dont' with the roller cam.

http://albums.photopoint.com/j/View?u=1617246&a=12345912&p=45146549.jpg

1970 Fastback, 4V 351C, various colors with black interior
 
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