63mako

It is 125 lbs per bolt pulling straight out, not at an angle. you won't pull the heads of them off or pull the threads as long as you have full thread engagement.

7t9l82

Apparently some will not believe what people tell them.

Indiancreek

With the head bolts you're dealing with the shear strength of the bolt and can use a grade 8 if you choose. With the intake you're dealing with the tread strength at what ever condition they have to be in at the time.

ezobens

It has nothing to do with believing anyone.
As an ME, I know on paper the threads should hold-
In practice, do I want to bet my life on 5/16" hardware/threads when 3/8" is readily available? For me personally, no-
I've seen too many manifolds with buggered up carb pad threads and don't even get me started on the QC of aftermarket parts.

But don't let me stop those of you that are more confident than I.

bellaireroad

It would be interesting to know if anyone has ever had or heard of a mishap by pulling from the intake

Scottd

I bought a load leveler from harbor freight that came with brackets. I hooked to 3 intake manifold bolts (used the stock bolts) and on hole in the head that my alternator bolts too. Everything went well. Im sure lifting straight up from the carb pad is fine, but I knew Id be jerking, pulling, and cursing this motor out. I just went with the theory bigger is better. (the bolts holding the lift mounts)

fastbruce

In Nascar I put Hundreds of Engines in and out W/ Headers, Bellhousings and Tranny with Carb plate only, I put my engine in and out of my Corvette with a Carb Plate, But the Big Block in the Nova SS got 4 corner chains off the heads

John Holmes

2 schools of thought on this subject:
1) people in the know who will use the carb flange.
and
2) p*ssies.

Scottd

And dont forget #3

3) internet trolls who love to stir the pot

cardo0

Ok, now that its a done deal i dont have to worry the consequences but i never used more than 2 bolts - on the intake to head bolts - whatever size they are. If u look at most OEM crate engines they have a loop plate usually at 1 end, sometimes both ends of engine and the bolts that hold that plate are tiny. I want to say 1/4-20 but too lazy to dig up my used ones up right now to measure.

For maneuvering the engine i liked and bought this TPIS "Happy Hooker" lift plate: http://www.tpis.com/parts/view/67. But havent got to test it yet. It will pick up from carb mount or the GEN II LT1 intake.

bashcraft

You're an ME and you're actually making a post like this? You can't be serious.

An ME who doesn't trust his own calculations isn't much of an ME.

bashcraft

Well, not the way I would've put it, but

No, it's called people who know what they're talking about.

Scottd

So, because some of us prefer to lift from the heads/intake bolts, we dont know what we are talking about?

Maybe I prefer the 4 points of contact that a load leveler gives me? Simply because its easier to grab 1 of 4 chains to help pull an inch or two in either direction.

Wow. I never realized that this thread would devolve into a pissing contest.

bashcraft

You don't know what you're talking about because of statements made like this one:

ezobens

My calculations I trust-
Other people's work, questionable castings and/or machining abilities I don't. With 500+ pounds of metal dangling over my head, I prefer not to take a chance.

7t9l82

here is a tip, Don't have your head under a 500 LB object and it won't be a problem.

bashcraft

Well then, do it. You'll find out it's perfectly safe.

bashcraft

Also, the earth could open up and swallow you. At least I've heard of that happening.

AzMotorhead

OH SNAP!!! Really!!!! I better just stay in bed tomorrow