broke drag motor...??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shortbed70 · 10-23-2010, 01:37 PM

Well we tore apart my buddies motor out of his 74 drag truck in progress,and we found a broken lifter,and one lifter that is mushroomed and will not come out of the block of course that lead to flat cam lobe but the delema is where did two bent rods come from.... Needless to say the 355 is becoming a 383 this winter and getting a 4.88 gear and manual vb glide with a trans brake. shooting for the 7,s in 1/8th mile in a full bodied truck.

*stich626* · 10-23-2010, 05:18 PM

bent rods are from no oil..
the stuck lifter blocking the oil flow..
what the pick up look like, full of cam chaft lobe

shortbed70 · 10-24-2010, 01:00 AM

That crap was everywhere. Bearings looked good still so where did the no oil cause the bend.

Marv D · 10-24-2010, 12:19 PM

Yeah, if it didn't blacken the bearings I would not suspect an oil starvation,, I'm not seeing how it would cause bent rods tho . My thoughts would be RPM stretching the rod to contact with the head,, or coolant entering the chamber and compression / hydrolock at RPM. Motors do crazy things just as they are starting to come apart.

10-23-2010, 01:37 PM	#1
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	broke drag motor...??? Well we tore apart my buddies motor out of his 74 drag truck in progress,and we found a broken lifter,and one lifter that is mushroomed and will not come out of the block of course that lead to flat cam lobe but the delema is where did two bent rods come from.... Needless to say the 355 is becoming a 383 this winter and getting a 4.88 gear and manual vb glide with a trans brake. shooting for the 7,s in 1/8th mile in a full bodied truck. __________________ Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274

10-23-2010, 05:18 PM	#2
stich626 Account Suspended Join Date: Sep 2010 Location: hingham ma Posts: 1,721	Re: broke drag motor...??? bent rods are from no oil.. the stuck lifter blocking the oil flow.. what the pick up look like, full of cam chaft lobe

10-24-2010, 01:00 AM	#3
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	Re: broke drag motor...??? That crap was everywhere. Bearings looked good still so where did the no oil cause the bend. __________________ Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274

10-24-2010, 12:19 PM	#4
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: broke drag motor...??? Yeah, if it didn't blacken the bearings I would not suspect an oil starvation,, I'm not seeing how it would cause bent rods tho . My thoughts would be RPM stretching the rod to contact with the head,, or coolant entering the chamber and compression / hydrolock at RPM. Motors do crazy things just as they are starting to come apart. __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.



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