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Skirt is offset from the wrist pin/piston pin 90°. Skirt wear may happen when there isn't enough clearance between piston and cylinder wall. Or the piston got too big from overheating. Or the piston is installed backwards, so the wrist pin and connecting rod offset is wrong. That makes a sound...

Your harmonic balancer is junk. For $140 you should be able to buy a new one.

Hi Rip, 516 is closed chamber 79-80 cc. 1970 383 originally had open chamber 906 heads 88 cc. I was also thinking about compression and wondering whether the transition to closed chamber would cause knock. It's not my engine. I was talking to another guy. His 1970 383 has run fine with 516 heads...

Hi rds Transmissions are heavy. To avoid shipping costs, you may want to stay local. I suggest that you take pictures of the RV trans - front, rear, and sides - and post them to this thread. We can help you with whether it needs mods. Ben

Big block bell housing looks circular. You need a big block trans for that 383 V8 Newport Small block looks flat on passenger side. Also torque converter cover bolts location and starter location are different on small and big block bell housings

516 head castings have the small exhaust valve 1.60" versus 906 heads which have 1.74" exhaust valve. Do you think 1.60" is enough for a 1970 383 mild cam, stock compression, stock trans, street cruiser 3.23 rear?

10.4 compression is high for a street cruiser. I have read that you can go with higher compression with aluminum heads, but still I think you will have a problem using only premium gas. Racers use higher compression with a bigger cam because of decreased cylinder pressure, but a race cam may not...

What company did you buy them from? Thanks

What gasket silicone did you use? Thanks!

Thanks, but Moroso 93055 are already installed on my car, so I am going to at least try them. I was asking Welder Guy about torque before I run the engine for the 1st time with the new valve cover gaskets.

1970 Fury Convertible 440/727. I spent a lot of hours cleaning, priming, painting, and installing stock valve covers. Aluminum not an option, although pics would be cool to see. Stock valve covers torqued at 40"lbs. I may have overtorqued, but Moroso generic directions are 80"lbs. Of course...

Did you use the Moroso recommended 80"lbs torque? Or did you go with the factory torque of 40"lbs? Thanks!

On my 1970 Fury 440, factory 4bbl manifold, I did use the fiber gaskets. I wanted extra leak protection. I did not paint the valley pan or use fiberglass. I used Permatex Ultra Gray RTV on the top of the block at the end bars.

If you are only replacing the pinion seal, you should not do anything with the collapsible spacer. 489 case has large spline. 1972 8 3/4 Pinion Yoke: Monkey wrench to hold yoke. Belleville washer, install with convex side forward. Pinion yoke nut, reinstall. Turn nut until pinion yoke fully...

Have the gasket cut. Workable but not beautiful. Thanks again big john.

Big John is sending a small sheet of rubber so I can cut my own gasket. Thanks!

So buy the new oil cap, remove the seal, and pitch the new oil cap?

I don't see oil cap seal. Engine, Valve Covers/Hardware :Mega Parts USA

Oil Filler Cap, Valve Covers/Hardware, 187-337-1070 Reproduction, NOS and Used Mopar Muscle Car Parts I see the oil cap listed. Is the oil cap seal listed separately somewhere?

Oil Cap from 1970s Big Block Valve Covers. Ditching the cheap chrome junk valve covers and going back to stock. Oil cap Rubber Seal was rock hard. 1st pic on right. Where can I buy a new Rubber Seal? just FYI. VHT SP 100 sprays on normal. Duplicolor DE 1652 is runny. I had to use 7 very light...