1970 XR7 Convertible first car

From dusty barn find to daily driver, it seems our cars are never really done. This is the place to share your progress on your project car. We will celebrate your victories and commiserate over your tragedies. But most of all this is a great place to learn!
allenrya000
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Re: 1970 XR7 Convertible first car

Post by allenrya000 » 11 Oct 2015, 06:04

It's kinda like a need for more power!

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xr7g428
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Re: 1970 XR7 Convertible first car

Post by xr7g428 » 11 Oct 2015, 10:40

allenrya000 wrote:Jumped a timing chain on my way to a dentist appointment. Sense I have to replace that I though I might as well throw a bigger cam in there and put on a set of new Hooker long tube ceramic coated headers
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Like it is going to end there...LOL! Good Luck finding a stopping place. I recall how replacing a leaking heater core resulted in a complete restoration for one of the guys on here.
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Currently in the Cat House
'67 XR7 GT 390 4 speed, AC, AM FM, Lime Frost Green
'68 XR7-G 428CJ C6, Tilt-Away, AM, Black Cherry
'68 XR7-G 390 4 speed, Sunroof, Cardinal Red
'68 XR7 GT-E 427 C6 AM Cardinal Red
'68 XR7 resto mod 351W, soon to be AOD, Black Cherry

Brian-1969Cougar
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Re: 1970 XR7 Convertible first car

Post by Brian-1969Cougar » 11 Oct 2015, 13:33

Yep... I'm in the middle of the biggest "while I'm at it" phase.... Clean interior replace headliner, while I'm at it replace vynal top, while I'm at it replace carpet, while I'm at it... Etc.. Etc... Car is almost stripped down to the shell and going to pull the engine and trans next....

Your 70 is going to be a nice ride with the amount of work you are able to put into it... Good job...

Brian..

allenrya000
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Re: 1970 XR7 Convertible first car

Post by allenrya000 » 17 Oct 2015, 19:09

well dad broke a bolt off in my head, so just got my heads back from getting a valve job.
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How do you guys like the stainless steel single grove valves?
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Continuing on the while I'm at it phase... on the right you will see one of my hookers setting on my engine block.
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Last edited by allenrya000 on 19 Oct 2015, 18:51, edited 2 times in total.

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1969XR7Vert
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Re: 1970 XR7 Convertible first car

Post by 1969XR7Vert » 18 Oct 2015, 09:03

One piece, single groove valves are the only way to go.
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allenrya000
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Re: 1970 XR7 Convertible first car

Post by allenrya000 » 19 Oct 2015, 17:47

hoping to do a engine brake tomorrow.
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BossElim69
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Re: 1970 XR7 Convertible first car

Post by BossElim69 » 20 Oct 2015, 06:22

generally you will find single keeper grooves on larger head dia valves. The larger head dia lets the valve flex more and has a scraping effect against the cyl head seat which keeps it clean from carbon build up. Smaller head dia valves. The head doesn't flex as much to scrap the carbon off the cyl head seat. So, I order to keep it clean the valve needs to rotate more when it gets excited at different natural frequencies through the rpm range. So, the smaller valve will have double and triple keeper grooves which doesn't lock the keys in and allows more rotation. The single groove larger valve will still rotate just not as much as it's locked into the spring retainer and has to rotate the valve retainer/spring as well.

So, in short single groove keepers is what you will want on your 351c with it's larger valve dia.
Brian Carpenter, President CATS classic Cougar club
67 Cougar road course racer
67 Cougar project car
67 Cougar GT
68 XR7-G trailer queen restoration.
68 Restomod
69 Boss 302 Eliminator
69 XR7 390 survivor
69 XR7 428CJ 4spd
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allenrya000
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Re: 1970 XR7 Convertible first car

Post by allenrya000 » 21 Oct 2015, 18:04

Got her all finished up for the most part today. Having a problem with the water pump pulley and the harmonic balancer pulley rubbing together. Also did the engine break, have the normal adjustments to do cause she is running rough. Also the drivers side header and the steering box tough together and also the passenger header and one of the steering linkages hit when turning to sharp. Got to spin around the block, missing a lot of power and the pulleys grinding is obnoxiously loud. also having trouble with the dwell and timing, dwell is about at 21. but all looks good.
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cougartracks351
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Re: 1970 XR7 Convertible first car

Post by cougartracks351 » 16 Dec 2015, 08:48

This is good work and I am happy to see a cougar convertible saved from the crusher.
It pains me to see a cougar convertible get strip for parts when it can be rebuilt.
And I love those Cleveland motors. They have a sound to the exhaust that is just different than all the rest. Healthy and bold even without the big cam.

Mick.

allenrya000
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Re: 1970 XR7 Convertible first car

Post by allenrya000 » 16 Dec 2015, 12:55

Btw that wasn't the end of that story... What happened the next day is that the lifter decided to grind down and round off the Lobes on the cam. Ended up being another 2 weeks. Now I have a new Lunati cam in there and running just fine ever sense. Starting to have a significant sputtering problem starting last night, don't know if there is moisture in my gas or what. hopefully not a loose timing chain again.

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