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Topics - jwrmach1

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FE Technical Forum / Overheated fresh rebuild
« on: April 05, 2021, 08:24:18 PM »
I am looking to the experts here for a little advice.  I have been lurking here for years as I assembled my 428.  Things did not go well this past weekend.  I finally finished my 70 Mach 1 and got it registered and it was time to take it for its first ride.  The 428 was run on the dyno at my local machine shop and it ran great with no issues.  In any event, for the first test drive, I headed down the road about three miles.  All was working great, good oil pressure, normal temp.  I turned around and headed back home but I hit the throttle a little and took off.  Little did I know at the time, a freeze plug popped out and I lost all coolant.  About half mile down the road I noticed the temp starting to rise.  I continued home, but the temp kept climbing and it started to knock.  I made it home the 2.5 miles home not knowing I had lost all coolant as the temp gauge was not in any coolant any more.  In hindsight, not a good decision.  I let it cool off for a few hours and did some troubleshooting and found the freeze plug missing.  Car seems to run ok,  I changed the oil and oil pressure is still great, but I'm worried so I pulled the plugs and stuck a borescope in all 8.  Piston tops all look good.  Cylinder walls all still show crosshatching with no vertical lines.  Of course it is all magnified with the borescope I used so little things look big.  There were some brown spots in cylinder 4 and oil in cylinder 8.  Cylinder 6 looked like it might have had oil in it too, not much though.  Compression is between 160 and 180 on all 8.  This seems like a big spread to me.  Should I pull the heads for a better look and replace the head gaskets?  What causes the freeze plug to pop out?  I did use the 1 49/64" brass plugs.  I hadn't planned on driving 6 miles before I had to tear it down again.  What to do next???
Thanks
Jack
70 Mach 1

2
FE Technical Forum / 428 in a Highboy
« on: February 05, 2021, 01:14:20 PM »
I've got a 72 Highboy with a 360 that I want to change to a 66 Tbird 428.  The end goal is more power but still look like a 360 under the hood.  The only concession on stock looks under the hood would be headers instead of the log manifolds.  I want to use iron heads.  This will do some trailer towing duties so top end power is not high on the list, but low and mid range torque is.    The question is which heads have exhaust ports that match up with the available highboy headers?  I would love to use 428CJ heads, but will there be a mismatch on exhaust ports?  I have a set of C7JE industrial heads or would the C6AE-R heads be a better choice with CJ valves?  Maybe the original D2's with CJ valves and port cleanup?   What would be a good cam recommendation for this type of application?
Thanks in advance,
JWR

3
FE Technical Forum / Piston to deck clearance
« on: January 06, 2019, 09:32:14 AM »
I am finally assembling the 428 after 30 years for my Mach 1.  The block is an early service block with a C1 scratch and casting date of mid May 1970.  My question after mocking up my assembly is that I have a deck clearance on cylinders 1-4 of .017-.018", but on the opposite bank the numbers are .027-.028".  I have the TRW L2303 .030 pistons.  Is it possible the block is off that much.?  Is this normal for FE blocks?  Should I have the block zero decked a different amount on each side?  If .028" is taken off the drivers side bank, and .018" off passenger side bank, will I have intake sealing woes or do I need to do machining to the intake? 
Thanks,
Jack

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