390 rod strength
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Postmaster
Joined: Jul 2003
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From: Pittsburgh
390 rod strength
What is considered the "acceptable limit" in RPM for Ford C1AE rods with replacement bolts?
Also are these just your typical car 390 rods (which i'm assuming) or are these the "PI" rods?
Just going through a motor i picked up, figuring out what all is in there. It has a cam equivalent to a hydraulic PI cam and has flat tops in it with a 390 "S" manifold, plus i can see all of the balance marks and grinds on the bottom end so it ::looks:: like this motor was done right, just making sure no one skimped anywhere.
Justin
Also are these just your typical car 390 rods (which i'm assuming) or are these the "PI" rods?
Just going through a motor i picked up, figuring out what all is in there. It has a cam equivalent to a hydraulic PI cam and has flat tops in it with a 390 "S" manifold, plus i can see all of the balance marks and grinds on the bottom end so it ::looks:: like this motor was done right, just making sure no one skimped anywhere.
Justin
Post Fiend
Joined: Jan 2003
Posts: 8,600
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From: Iowa
Depending on pistons, assuming they're in good shape, and not doing any special prep, I'd guess about 7000rpm.
Here's a quote from an article on http://www.doveengineparts.com/. He's comparing 390 rods to Ford 400 rods:
Here's a quote from an article on http://www.doveengineparts.com/. He's comparing 390 rods to Ford 400 rods:
I have seen stock 428's run over 8300 R.P.M. with properly prepared 390 rods. There are HI-PERFORMANCE bearings available for the 390 rod and the rod is spot faced to accept the football shaped rod bolt head. The 400 rods are broached, which makes a perfect place for the 400 rod to break. The 390 rod cap is well designed and has large ribs added to the cap for strength. The 400 cap is plain with no ribs. It is designed to run under 4000 R.P.M with a 2 barrel carb and pull Mark 5's and 3/4 ton trucks around. It was never offered with a 4 barrel carb.
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Postmaster
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From: Pittsburgh
Then that's well within what i want to do. I pulled one of the pistons off of the rod and checked the rod bushing, it looks brand new and specs good.
The pistons have a ford casting number on them, but they come within spec and from the piston faces don't look like they have many miles at all, almost like the pistons were a NOS set of some sort.
I was just making sure the rods would be fine for the 5500-6000 rpm this motor should be wrapping out.
Justin
The pistons have a ford casting number on them, but they come within spec and from the piston faces don't look like they have many miles at all, almost like the pistons were a NOS set of some sort.
I was just making sure the rods would be fine for the 5500-6000 rpm this motor should be wrapping out.
Justin
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