Someone please help

[Iceman12]

I just bought a blazer, previous owner swapped out the 305 with a 350, all works well except the manifold bolt pattern.

A friend has exhaust manifold from a 74 camaro 350
I'm new and want to know if I can use them

Please

 

[Iceman12]

I haven't taken mine off but they look the same image 1

 

[cuervo]

The exhaust for both the 305 and 350 should be the same. Sometimes after many years of use when you remove an exhaust manifold they tend be warped a bit which could keep them from bolting back on.

 

[Iceman12]

The end bolt is the one which isn't cooperating

 

[cuervo]

Yeah the manifold is warp just a bit. I've seen people try to spread them back out while trying to get the bolt started but most of the time they end up cracking the ear off.

 

[Keitha]

Start with the 2 outside bolts and do not tighten them - Just get the treads started then work on the others. Once you get them all started, follow back around and tighten them.

 

[runamok151]

Throw some headers on there and forget the manifoldsburnout

 

[dyeager535]

I've always wondered if when the manifolds are warped a bit, if you could just use a slightly larger drill bit (perhaps metric?) to enlarge the hole enough that you didn't have to fight getting the threads started, without overly compromising the manifold strength.

 

[Iceman12]

Throw some headers on there and forget the manifoldsburnout

I can't because we have smog laws out here that prevent it to my understanding

 

[diesel4me]

When I had that problem ,(manifold not wanting to bolt up),I took it in my garage ,and fired up my wood stove,and placed it on the hot coals for a good 10 minutes,then used my welding gloves to take it out --it was painful to install,but the bolts lined right up!..

Some 305's in the early 80's had heads with one less exhaust manifold bolt than all the other small blocks--most of them had manifolds that went over the spark plugs instead of under them,and they also had 2 bolt flanges for the exhaust pipes..most of those were used on Malibu's and Monte Carlos and some Camaros..we had people searching for them come in the junkyard often,we only had a few pairs though..

 

[70jimmy]

They make manifold spreaders. Pretty cheap. It is like a collar in the middle and you use a wrench to loosen the bolts that stick out of the collar and that spreads the manifold.

Most auto parts stores have them or can order them. I will see if I can find a link.

 

[70jimmy]

Here you go.

http://www.oreillyauto.com/site/c/search.oap?keyword=exhaust+manifold+spreader

12.99 each. I have two. I think heating them up in an oven might be smart also. but you can make them move without.

 

[sponsoredbydad]

I can't because we have smog laws out here that prevent it to my understanding

Edelbrock makes a sweet 50 state smog legal header which are good in cali. Had some on my 87 Burb. They are awesome, but awesome ain't cheep $600 or so

 

[Iceman12]

Wow guys this is so helpful thanks a bunch