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Canadian Poncho Homepage -> Canadian Poncho -> The Lounge -> 85 1ton 454 manifold bolt question
Post Info TOPIC: 85 1ton 454 manifold bolt question
DonSSDD


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85 1ton 454 manifold bolt question
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our volunteer fire dept has an 85 Chev 4 WD dually water truck, it has had a noisy exhaust leak for many years. We have it at a heavy truck dealership for an MVI and they would like to install new exhaust manifold gaskets on one side. What are the odds of a rusty manifold bolt breaking off in the block and if 1 or more does, is this an easy fix?

My thought was leave it as is, we dont drive it very far and when in use, its sitting pumping or sucking water. It has about 5000 KMs and was bought new.

Leave as is or repair ?

Thanks for any advice. 



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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
4SPEED427


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The odds of breaking a bolt in the head are very slim, at least based on my experience at the dealership. GM's small and big blocks are by far the best out there for not breaking manifold bolts. The bolt is a special shallow thread bolt that won't seize as easily.

However, that engine should not have a manifold gasket, it should be metal to metal. If there is a manifold gasket in there now it's not original. If it's leaking with a gasket, the manifold may be warped.

Are you sure it's not cracked? That is a common problem on them when they work hard.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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JC2+2


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If you have an exhaust leak due to warped manifold, like Carl said do not use a gasket. What will work is steel on steel with muffler cement.

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'68 Parisienne 2+2 Convertible Matador Red (Resale Red but not for sale).
DonSSDD


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Thanks for the advice, Ill crawl under this myself with the guy fixing it, I asked him if it was cracked, he thought it was not. GM still sell this head?

Any good reason not to leave it as is? The only risk is carbon monoxide?

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
4SPEED427


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If it is leaking but not yet warped and you keep running it that way, it will likely ruin the manifold. I think it's best to repair it now as it's likely cheaper now than if left to get worse.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Pontiacanada


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I have a '63 283 & 'glide that I can trade you for that big ole noisy engine.wink



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'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.

DonSSDD


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Need a little more torque Darryl. This thing will cruise at 120 loaded with water and burn an unbelievable amount of gas. It has a 4 speed with that really low 1st gear.

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
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Pontiacanada


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I have some stumps on the property that need pulling ...



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Prince Edward Island

'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.

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