Build a 390
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Joined: Aug 2004
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Build a 390
I am building a 390 for my '79 F150
forged pistons (flat top)
edelbrock heads and intake
Harland sharp rockers
crane extreme energy cam
I want to do Mpfi with holley commander 950 system
gonna deck and line hone block etc
But i noticed .... my Con rods all seem to be same casting numbers but they all slightly look different. For example the nub the sticks up abouve the wrist pin end can vary in height by over 1/8 inch. Should i look for Better rods?
forged pistons (flat top)
edelbrock heads and intake
Harland sharp rockers
crane extreme energy cam
I want to do Mpfi with holley commander 950 system
gonna deck and line hone block etc
But i noticed .... my Con rods all seem to be same casting numbers but they all slightly look different. For example the nub the sticks up abouve the wrist pin end can vary in height by over 1/8 inch. Should i look for Better rods?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Yeah, Rusty is right, sounds like it was already balanced once. Get the rotating assembly balanced this time and everything should be fine.
I'd put on a regular carb first and get the cam broken in and everything before trying to get the MPFI working. Someone else here has already done it, but had a hard time getting it perfect.
I'd put on a regular carb first and get the cam broken in and everything before trying to get the MPFI working. Someone else here has already done it, but had a hard time getting it perfect.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
I have no idea if the factory tried to match the rods to the pistons, but anything is possible. Was it EVER rebuilt before?
Either way, get it balanced this time around and don't worry about the rods, they'll be matched to the pistons.
Do all the con rods have numbers punched into the big end on both the rod itself and the cap?
Either way, get it balanced this time around and don't worry about the rods, they'll be matched to the pistons.
Do all the con rods have numbers punched into the big end on both the rod itself and the cap?
