410 not that easy

[DuckRyder]

428 Cobra Jet sizes, 427 are bigger at 2.19/1.73

The 427 valves won't clear, but the CJ did on mine.

Some guys say they notch the bores, but I did not have to.

[nevrenufhp]

I like that 300 pounds of torque at 1000 rpm!

[68F250]

I like how you go from 300 to 418 ft.-lbs. from 1000 to 1500 rpm, that's 90% of the peak torque! Ya can't get that out of a 390, it will put a big smile on your face at every stoplight.

[HOWDY69]

This is a 410 engineering update. We are going with the 2.08/1.64 valves and have found a used Performer RPM intake to use instead of iron. It’s rated for 1500 to 6500 and will match well with the stock heads. It sounded kind of high RPM to me. I asked if the Performer 390, which is the OEM replacement according to Edelbrock, would be better and was told the runners were too small for 416 ci unless someone just wanted pure low-end torque and the Performer RPM would give a better balance of torque and power.

Carburetor is a Holley 4150 650 cfm with electric choke and vacuum secondaries.

BTW the estimated volume on the 381P piston after installation is 18 cc’s. So once again you were very close Duckryder. They will be cc’ed after installation and I will let you know how they prove out.

[DuckRyder]

Performer RPM should work fine for you power wise, however:

That manifold moves the carb back about an inch, based on the fact that the additional height of my Blue Thunder (which does not move the carb back) causes a stock air cleaner to be very tight on the lip in the firewall, I would caution that if you intend to run a standard air cleaner it may cause clearance issues.

If you plan to run a typical open element it is no problem, but if you want to run a stock aircleaner check it out.

[HOWDY69]

Thanks for the heads up on the air cleaner. When I dropped the truck off today I talked to Tom about zero decking. He said he was not planning on doing it to my engine because a pre-machining mock-up was not in my budget. He said it also caused problems with matching the intake to the heads. He will have the machine shop square the decks. After he installs the pistons he will cc them and the combustion chambers and go from there. With the 1.660 pistons and the theoretical 10.17 deck height the piston to deck would be 0.032. Machining the deck will reduce that somewhat. Sounds like we are still on track for 9.5 or less. I should have the sonic test results in a few days.

[pat67shorty]

Honestly, with 9.5:1 I don't think you'll have too much trouble with 87.

The 9.5:1 car 390 in my truck happily munches on 87 while I flog it, and I have yet to hear it ping, let alone knock.

[HOWDY69]

Now that I have made it through the first 500 miles on the new 410FE I would just like to thank everyone for your help and support. Your advice and experiences really helped me make some critical decisions. Here is what I ended up with.

360 block bored 0.030 over
428 crank 20/20
OEM rods ARP bolts
Sealed Power 381P pistons
CJ valves, mild porting
Performer RPM intake
Holley 4150 carb
FPA Try-Y's (future installation)

Compression is 9.6 to 1
Temperature is 160 with 4 row radiator
(I am sure it will go up this summer)
Oil pressure is 3/4

I still have a lot of work to do on the truck but I feel like I have crossed a major hurtle with the engine rebuild. Thanks again for all the help and support.

[CJ,s 67 F100]

I think the cut off on reg. unleaded is 9.5-1 . Our 9.4-1 390 runs great on Reg. Unleaded

[69rangerman]

WOW! Now I know why you 390 guys are all torqued (get it..) about your motors. I could not believe the size of those pistons on duckryders hood! My itsy bitsy 302's barely qualify as pistons in comparison. Cool to see advice and support manifested in a working motor.

Tom

[waynaferd]

So you have a 428 crank and 390 pistons, and regular 360 rods, correct?

And if you don't mind, how much was everything (parts, machine work, etc)?

Thanks!!

[suavematt]

~ Suave'

[DuckRyder]

428 Crank
390/428 Rods (no 352/360 rods)
390 TRUCK pistons or some of the aftermarket for this application (Ross, Probe, and JE/SRP make them)

You will have to either internally balance ($) the 428 crank, or run a 428 flexplate/flywheel.