Bent pushrod

Dark_5.0 · 04-17-2007, 11:20 AM

Ok last year I was in a index race at the local 1/8th mile track and in the finals I over-revved my car to about 7000rpms while doing the burnout. It immediately began to tick but I went ahead and raced the race and ran a 8.14 on a 8.20 index, this was with my old 302.

Anyways I just got around to tearing it apart and the pushrod on the #8 intake valve is bent but there are not any signs that the piston contacted the valve. The piston and the valve look untouched.

Could spring pressure alone bend a pushrod? And why just the one bent pushrod?

This motor made about 20 or passes with the new .566 lift cam before this happened.

1989GT · 04-17-2007, 01:16 PM

What springs/heads/rocker arms were you running?

andy669 · 04-17-2007, 04:58 PM

If you bent a pushrod, theres a really good chance you bent a valve too. It might be really hard to see, and you might not even notice it until its chucked up in the valve grinder. You'll definately want to have that guide looked at too, but with just a tweak in the valve, it probably didnt damage the guide.

Andy

Dark_5.0 · 04-17-2007, 08:59 PM

I was running Canfield heads, Harland and sharp roller rockers, and the machine shop set up the valve springs specifically for my Ed Curtis custom cam.

My piston to valve clearances were just within spec so I am really not surprised. I just wonder why only one of the pushrods bent.

I am sending these heads off to Abbot Racing heads for some new valve springs and to get checked out before I put them on my stroker.

04-17-2007, 11:20 AM	#1
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Bent pushrod Ok last year I was in a index race at the local 1/8th mile track and in the finals I over-revved my car to about 7000rpms while doing the burnout. It immediately began to tick but I went ahead and raced the race and ran a 8.14 on a 8.20 index, this was with my old 302. Anyways I just got around to tearing it apart and the pushrod on the #8 intake valve is bent but there are not any signs that the piston contacted the valve. The piston and the valve look untouched. Could spring pressure alone bend a pushrod? And why just the one bent pushrod? This motor made about 20 or passes with the new .566 lift cam before this happened. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

04-17-2007, 01:16 PM	#2
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	Re: Bent pushrod What springs/heads/rocker arms were you running? __________________ 89GT,Pro-Bullet 306, H/C/I and a bunch of other stuff. Sold 00GT, Vortech S-Trim, Steeda Boost Pipe, C&L intake, Mac off-road H-pipe, Flowmasters, B&M Ripper shifter, Eibach Sportline springs, Koni Struts/shocks, MM full length subframe connectors, Cobra brakes, 3.73's. My Car Domain Page

04-17-2007, 04:58 PM	#3
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Re: Bent pushrod If you bent a pushrod, theres a really good chance you bent a valve too. It might be really hard to see, and you might not even notice it until its chucked up in the valve grinder. You'll definately want to have that guide looked at too, but with just a tweak in the valve, it probably didnt damage the guide. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

04-17-2007, 08:59 PM	#4
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: Bent pushrod I was running Canfield heads, Harland and sharp roller rockers, and the machine shop set up the valve springs specifically for my Ed Curtis custom cam. My piston to valve clearances were just within spec so I am really not surprised. I just wonder why only one of the pushrods bent. I am sending these heads off to Abbot Racing heads for some new valve springs and to get checked out before I put them on my stroker. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

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