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I am using billet caps from 400 that blew up in the Demon before I got it.

I assume a Main Girdle is in store.
Whose product would be good?

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I have seen and looked at several different brands of main girdles for Mopar BB motors, I don't own or use one due to the fact that the oil pan studs don't limit or add any strength to the girdles, the main studs limit the for and aft movement of the girdles but do not strenthen the bottom of the block that I can see I do beleive in and use better main caps and main studs on stock blocks,
but no girdles Put that money for the girdle and machine shop charges towards a good race block instead Every part in every production motor has a designed fatique limit built into at the factory, once you exceed that limit your on your own

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Why the big 18cc dish on the pistons?
You will loose quench and squish completely - better off with a larger cc head and flat tops

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I had to go with 22cc dish pistons on my 416 so
I could run on pump crap.. 87 octane for the street
and 93 for the track... still has a .040 quench

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With 440-1 heads, you will have more than enough head, so big cubes and a light rotating assembly will work best. A long rod 512 motor produces a lighter bob weight than a 499, which is an advantage of being easier on a stock block plus it is 2.5 percent bigger. That may not be much but I will take the 2.5 percent extra torque in a street car any day.
Considering that you have 440-1 heads, those heads have the runner volume to put peak torque as high as 5200 rpm, so the more cubes, the better off you are for low speed and mid range. I can see the advantages of even more stroke than 4.25 in a deal like yours. I would go as big as I can and still get a decent piston in it that will live a good street life.

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With 440-1 heads, you will have more than enough head, so big cubes and a light rotating assembly will work best. A long rod 512 motor produces a lighter bob weight than a 499, which is an advantage of being easier on a stock block plus it is 2.5 percent bigger. That may not be much but I will take the 2.5 percent extra torque in a street car any day.
Considering that you have 440-1 heads, those heads have the runner volume to put peak torque as high as 5200 rpm, so the more cubes, the better off you are for low speed and mid range. I can see the advantages of even more stroke than 4.25 in a deal like yours. I would go as big as I can and still get a decent piston in it that will live a good street life.

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Long rod 512 low deck sounds nice, I would guess that uses a 6.700" rod and pistons like those from the 4.15" stroker?

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Building a motor for the pro tour charger which will have five speed overdrive in a 3800 pound + 69 charger air-conditioning and fuel injected.

For this type car is the 499 with the longer rod preferred over a 511?

Also who would be a premium parts supplier for rotating assembly?

This is a rework of the 383 based motor I initially built. Aluminum Indy – 1's will be employed.

Thanks in advance

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