This is a combination I've not tried before - anyone know what length pushrods to use with a flat-tappet 289 and GT-40 (non-"P") heads?
Pushrods for 289 with GT-40 heads
- Thread starter Loup-garou
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Hack
15 Year Member
Get an adjustable length pushrod checker so that you get your valvetrain geometry correct. I bought the one from Comp for $20. Well worth it IMO. Every engine is different, as are every set of heads. You're spending a lot of money on parts and machine work, get the valvetrain right so you don't wear out the guides right away.
Falcon79
Active Member
What roller rockers are you going to use? I have a 302 with GT-40 heads with the 1:7 crane rockers. I was able to use standard length pushrods. You however are probably running flat tappet lifts and not rollers.
Standard Ford rockers for now. The pushrods I believe will work are the ones for the 5.0, pre-roller cam (1982 or so). I'll get an adjustable pushrod to make sure, though - I can't say for sure if the heads have been milled.
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