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General Discussion / Re: Speedometer Adaptor?
« Last post by Mike_B_SVT on Today at 12:50:48 pm »
There are no internal, external retainers or springs,etc. If the housings are screwed together and the gears and bushing are in there,it will work unless a gear is stripped or the cable on either end is not fully engaged or there is a problem with the plastic driven gear inside the trans.

Or a shaft in the adaptor is sheared.
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General Discussion / Re: 355 HP...really
« Last post by geraldt52 on Today at 12:01:33 pm »
... With the stock non adjustable rockers the pushrods had to much preload in the lifters and as the RPM and oil pressure increased the lifters pumped up and held the valves open...

I've never heard of that, but I don't doubt it and it's really interesting.  You probably don't remember, but had the deck and heads on the engine been heavily milled?  Was there a high pressure oil pump involved?  Were the valve stem heights within specs?
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General Discussion / Re: Speedometer Adaptor?
« Last post by b--r30 on Today at 11:23:45 am »
There are no internal, external retainers or springs,etc. If the housings are screwed together and the gears and bushing are in there,it will work unless a gear is stripped or the cable on either end is not fully engaged or there is a problem with the plastic driven gear inside the trans.
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General Discussion / Re: Dearborn vin tags
« Last post by lr68cj on Today at 10:54:05 am »
Mine is screwed on. At first I thought something was wrong, but everything else was right. Both aprons had the correct vin ( but blank engine code, which I found out was common ) wrap around shock towers, and staggered shock mount on the body. I finally quit worrying about it thinking that the factory would not stop the line if the vin tag guy ran out of rivets, or he was on break and the fill in guy didn't know it was supposed to be riveted. I saw a vin tag that the "R" looked like it was a "P" with an "I" stamped on it to look like an "R". Way out of proportion to the rest of the digits, but I heard that wasn't impossible either ( assembly guy couldn't find the "R" stamp? Who knows.). It was in the 200's iirc. My 2¢.
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General Discussion / Re: 355 HP...really
« Last post by lr68cj on Today at 10:36:34 am »
Losing 100 hp from 4700 to 5200 sound like valve springs to me. Hydraulic cam should rev to 6200 with no issues. Torque should fall off after 5252, but hp should still be going up or at least leveling off. Had a 351c of mine on the Dyno and wouldn't rev past 5500. Springs we're bouncing all over the place. Not enough spring pressure closed or open. First place I'd look. My 2¢.
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General Discussion / Re: Speedometer Adaptor?
« Last post by Vcode on Today at 10:30:10 am »
There are two different adapters (Auto vs Manual).

https://www.428cobrajet.org/id-speedometer-adapter

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General Discussion / Re: Valve Cover bolts Again
« Last post by Vcode on Today at 10:25:12 am »
They were used for valve covers on 1967-68 GT-500's
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General Discussion / Re: Valve Cover bolts Again
« Last post by lr68cj on Today at 10:18:42 am »
Bolts marked R,B,W are common markings on Ford bolts, but I don't think they were used on valve covers. My 2¢.
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General Discussion / Re: No fuel pressure
« Last post by thor72 on Today at 09:49:03 am »
     Ooooh, there is some good advice.
I will try this with my finger it’s hard can’t get encentric to move. I bench tested both pumps I have. Put a hose and gas in a pail and cycled pumps they both squirt fuel a lot shoots all the way across the garage
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General Discussion / Re: 355 HP...really
« Last post by Richard Todd on Today at 07:18:04 am »
After my post I flipped thru my old dyno files and I found a test session I did on a 390 which had a similar problem. When I tested the spring pressure they were all good with the seat and open pressure within 10 lbs. of spec. The HP numbers seemed low and it was done by 4500. I replaced the rocker arms with a set of stock Ford adjustable rockers and push rods an adjusted the valves to 0 lash plus 1/8 turn of preload and it cured the problem. The engine ran to 6000 RPM an picked up 55 HP. With the stock non adjustable rockers the pushrods had to much preload in the lifters and as the RPM and oil pressure increased the lifters pumped up and held the valves open. 99 times out of 100 its a valve spring problem but this time it was not. My point here is you need to test the springs before you do anything else. What rocker arms are you running on you engine?
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