70 LT1 Intake Bolt Question.

[Ralph B.]

Need your help: Getting ready to install the intake manifold and just noticed that the set of intake bolts that I received from Paragon (which supposed to be correct for this application) has (1) of the bolts that is approximately 1/4" longer than the rest of them, plus it has a different "head marking". ---- Is this right and if so, where on the intake does this go ?????
Thank you !!!!!
Ralph

[Edward J.]

Re: 70 LT1 Intake Bolt Question.

Ralph,
The Longer Bolt Goes To The Engine Lift Bracket And Is A Different Head Marking,ive Found This On My 72 Small Block.

[Ralph B.]

Re: 70 LT1 Intake Bolt Question.

Ed,
Thank you ---- that makes sense, the lift braket on the passenger side is thicker then the drivers side lift bracket so I will assume it must be for the thicker one which is the very last bolt near the firewall on the passengers side which is where I will install it.
I really appreciate your help!
Ralph

[Mike E.]

Re: 70 LT1 Intake Bolt Question.

There's also a shielding bracket back there, isn't there? That, in conjunction with the lift bracket, necessitates the longer bolt.

[Ralph B.]

Re: 70 LT1 Intake Bolt Question.

Mike,
I believe the shielding brackets and lift brackets do not share the same intake bolts.
This is the way I understand it:
Passenger side: Lift bracket is on the last intake bolt hole near the firewall and the shielding bracket is the next to last intake bolt hole.
Drivers side: shielding bracket is on the very last intake bolt hole near the firewall and lift bracket is on the second from the front of the engine.
I just was just not sure where the longer bolt went until Ed got me straightened out.
Ralph

[Paul O.]

Re: 70 LT1 Intake Bolt Question.

Ralph The fwd lifting bracket has the 2 bolts that are longer the normal config bolts are used at the shielding brackets at the driver/pass rear the aft lifting bracket is attached to the bell housing too the engine case bolt not at the manifold. Paul 18046

[Patrick H.]

Re: 70 LT1 Intake Bolt Question.

I find that the repro bolt sets really don't match what you find on original motors. Often I have seen 3 different bolt types

- one slightly longer bolt type (2 bolts total), often with flanged head, holds down the lifting eye at the left front of the engine.

- one "normal" length style but with alternate head marking (2 bolts total) are used at the spark plug wire supports

- the remainder of the intake bolts all match with respect to headmark and length.

So, to me "most factory correct" or "more typical of factory production" you will need at least two different bolt types (left front lifting eye + the rest) if not three.

Note the photo of my 72 below. The lifting eye bolts differ from the "normal" intake bolts.

Patrick

[Ralph B.]

Re: 70 LT1 Intake Bolt Question.

Paul,
I stand to be corrected, after looking at my judging manual it confirms what you have described except it calls for a (1) hole bracket.
Thank you,
Ralph

[Terry M.]

Re: 70 LT1 Intake Bolt Question.

The 1970 lifting eye attaches to the intake bracket with one bolt, and attaches to the driver's front bolt. In 1971 and later they went to the two-bolt bracket that is shown in Patrick's photo. I don't think that information is a secret, and has nothing to do with the engine type. I'm pretty sure we put it in the TIM&JG.

Yes for 1970 that bolt has a different head mark than the others. But -- Patrick is on the right track -- my 1970 LT1 has five different kinds of fasteners holding the intake manifold. Of course that counts the stud for the TCS solenoid.

I have posted those head marks at least twice on the old board, and I really think it was three times. If you think any kit of fasteners from anyone can duplicate the original fasteners -- well let me tell you about the beachfront property in Arizona.

[Ralph B.]

Re: 70 LT1 Intake Bolt Question.

Terry,

I'm still a little confused i.e. --- the way I now understand it is:

PASSENGER side attaches to the bell housing to block bolt and is orange in color.
DRIVERS side attaches to second from the front with a one bolt bracket painted silver. ---- I now assume that this uses the longer bolt with the different head mark due to the additional thickness of the bracket ---should this be painted with the same dull aluminim paint used on the intake or a different silver finish? ---- plus I have (2) styles of lift brackets --(1) which bent up but basically straight, and the other has a right angle bent tab at the top --- which goes where ??
I never realized how involved this can be and I appologize for the confussion.
Ralph

[Terry M.]

Re: 70 LT1 Intake Bolt Question.

Yes, the one at the bell housing to engine bolt could be orange, or mostly orange, depending on how much over spray got on the bell housing. That varied from engine to engine, and very much depends on when your engine was built. Early 1970 LT1s might not have any orange on the bell housing, and on some the back of the heads and the flair for the bell housing attachment were painted with a brush. So the answer to that depends on when your 1970 engine was assembled.

The one on the intake is just a right angle with two holes in it. The smaller one for the bolt for the intake fastener and the larger for the hook to lift the engine. The originals had a notch cut out of one corner. The reproductions I have seen do not have that detail. It is just another case of "close enough is good enough."

I hope the picture helps.

[Bill L.]

Re: 70 LT1 Intake Bolt Question.

I can say that my 70 had three different bolts. The lift bracket had a bolt with an "A" head mark with flange and is identical to the bolts attaching the bell housing. Except for the stud for TCS solenoid, all other bolts were hex head with an "A" head mark and of course no washers.

Hope that helps.

Bill

[Paul O.]

Re: 70 LT1 Intake Bolt Question.

Ralph Terry is right on the money I was thinking 71-72 sometimes the memory fails on all the little details but at least I was in the ballpark. Paul 18046

[Ralph B.]

Re: 70 LT1 Intake Bolt Question.

I'm all set and thank you all for your help.
Ralph