Big Block gurus please help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

justpball · 02-19-2011, 07:26 PM

I have an 87 with factory 454 with TBi, rod in knocking... My buddy has a MV gen 3 block and I am wondering if I can just swap blocks or are there difffs that would be a pain
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**old Rusty C10** · 02-20-2011, 12:21 AM

i wish i had the answer for you but if you dont recieve a response on this I will move to engines in the AM tomorrow

80SPORT · 02-20-2011, 12:59 AM

If your question is will the bare blocks interchange the answer is no;
You can however change out the whole motor.
If you just want a block they are the same from 1970 to 1990(Mark 4 motors)so there are lots around.
The mark 5 went to 1 pc crank seal(different flex plate) and different cylinder heads

Weak areas on high mileage engines are pistons,camshafts and lifters

justpball · 02-20-2011, 10:00 PM

Thanks bud, I found a 78 454 so working with that now
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f.monroe · 02-20-2011, 10:54 PM

Are you positive its a rod knock? I had a 454 truck that suddenly developed a knock. Sounded like a rod but oil pressure was fine .I ran a little top engine cleaner through it and cleaned the combustion chambers out . Knock gone . It was a piece of carbon that had apparently attached to a piston and was smacking the head. Just a thought . There are cheaper ways to clean carbon from the chambers but this one worked.
Frank

02-19-2011, 07:26 PM	#1
justpball Registered User Join Date: Dec 2008 Location: Silverhill, Al Posts: 2,026	Big Block gurus please help I have an 87 with factory 454 with TBi, rod in knocking... My buddy has a MV gen 3 block and I am wondering if I can just swap blocks or are there difffs that would be a pain Posted via Mobile Device __________________ Fuzzy Dice Club Member 87 Crew SWB Build for the crew http://67-72chevytrucks.com/vboard/s...d.php?t=430082 http://www.cardomain.com/ride/3232925 90 burb 2wd Build Thread For The Burb! http://67-72chevytrucks.com/vboard/s...d.php?t=383055

02-20-2011, 12:21 AM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: Big Block gurus please help i wish i had the answer for you but if you dont recieve a response on this I will move to engines in the AM tomorrow __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

02-20-2011, 12:59 AM	#3
80SPORT Registered User Join Date: Mar 2008 Location: red deer alberta Posts: 777	Re: Big Block gurus please help If your question is will the bare blocks interchange the answer is no; You can however change out the whole motor. If you just want a block they are the same from 1970 to 1990(Mark 4 motors)so there are lots around. The mark 5 went to 1 pc crank seal(different flex plate) and different cylinder heads Weak areas on high mileage engines are pistons,camshafts and lifters

02-20-2011, 10:00 PM	#4
justpball Registered User Join Date: Dec 2008 Location: Silverhill, Al Posts: 2,026	Re: Big Block gurus please help Thanks bud, I found a 78 454 so working with that now Posted via Mobile Device __________________ Fuzzy Dice Club Member 87 Crew SWB Build for the crew http://67-72chevytrucks.com/vboard/s...d.php?t=430082 http://www.cardomain.com/ride/3232925 90 burb 2wd Build Thread For The Burb! http://67-72chevytrucks.com/vboard/s...d.php?t=383055

02-20-2011, 10:54 PM	#5
f.monroe Senior Member Join Date: May 2004 Location: Caldwell,Tx. Posts: 3,648	Re: Big Block gurus please help Are you positive its a rod knock? I had a 454 truck that suddenly developed a knock. Sounded like a rod but oil pressure was fine .I ran a little top engine cleaner through it and cleaned the combustion chambers out . Knock gone . It was a piece of carbon that had apparently attached to a piston and was smacking the head. Just a thought . There are cheaper ways to clean carbon from the chambers but this one worked. Frank __________________ Born and proudly residing in a Red State !



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