[chiphead]

Federal Mogul 4040M 3/4 groove mains. Clevite rod bearings. full groove is old school and developed before the engineers fully understood the need for a good oil wedge to support the crank. I once took a P350 apart that had full groove mains and you could see the abnormal journal wear that lined up with the full groove.

Some constructive criticism- I would ditch the stock rods in favor of cheap forgings. By the time you install aftermarket bolts and have the big ends resized, its the same cost as stronger rods.

XE256 is a decent cam for a P350, but not a 400. I had that cam in the same 350. XE cams have valvetrain noise in my experience with 2 different XE grinds. I'd use a slightly larger cam like a Summit 2800, a 067 copy or something with about 215 duration with 112LSA. The XE grinds are on a 110LSA so the power peaks then ends early. Those 96 heads will put the compression in the mid to high 8s, so you'll have to mill them if you want any serious power.

[hurryinhoosier62]

Originally Posted by chiphead

Federal Mogul 4040M 3/4 groove mains. Clevite rod bearings. full groove is old school and developed before the engineers fully understood the need for a good oil wedge to support the crank. I once took a P350 apart that had full groove mains and you could see the abnormal journal wear that lined up with the full groove.

Some constructive criticism- I would ditch the stock rods in favor of cheap forgings. By the time you install aftermarket bolts and have the big ends resized, its the same cost as stronger rods.

XE256 is a decent cam for a P350, but not a 400. I had that cam in the same 350. XE cams have valvetrain noise in my experience with 2 different XE grinds. I'd use a slightly larger cam like a Summit 2800, a 067 copy or something with about 215 duration with 112LSA. The XE grinds are on a 110LSA so the power peaks then ends early. Those 96 heads will put the compression in the mid to high 8s, so you'll have to mill them if you want any serious power.

Never have seen that in the engines I've built. I have seen FM bearings have wide variations in thickness due to the fact they're made in Mexico. If you're concerned about full groove bearings, use Mahle Clevite p/n MS-483G (mains, grooved only on the top shell) and CB-758HN (rods). I agree with replacing the stock rods with QUALITY 5140 replacements. Stay away from TRW/Speed Pro forged pistons. They're quite heavy when compared to Icon or SRP forgings.