73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Surfdude on September 28, 2017, 12:08:56 pm
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I know there are lots with more experience than me and a few of you who also have to contend with the lovely CARB regulations here in California so..
1978 Chevy C10
Engine 350 SBC
Intake manifold with all of the state-mandated smog fittings casting number: 346249
The new block has a casting number of 10243880, 92-96 model years.
Will the two mate unmodified? I ask because as I am trying to put the manifold on but the 4 center bolts look as if they are drilled at a more perpendicular (straight up) angle than the rest. I am asking before I get the grinder out and modify the holes then epoxy back to size.
I would like to put an aftermarket intake manifold on, but there are no intake manifolds with the magic EO (executive order) paperwork available. Has anyone put on a Performer manifold with the EGR option and successfully passed smog in CA?
I want to keep it carb'ed (I luvs me the sound of 2ndaries opening up) so am leaning against TBI, that and the hassle of the state come smog time.
I appreciate all of the help, I would post pictures if I was doing anything interesting but all of us have seen greasy engines that have sat for 30+ years.
Thanks for the help,
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It's not the block it's the cylinder heads that you have to worry about. If you are putting an early manifold on center bolt heads then you need to elongate the 4 center bolt holes. I'm fairly certain professional products intakes come with the adapters and elongated holes.
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It's not the block it's the cylinder heads that you have to worry about. If you are putting an early manifold on center bolt heads then you need to elongate the 4 center bolt holes. I'm fairly certain professional products intakes come with the adapters and elongated holes.
They do. I have one on an 87 350 in my 37
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Thanks, I have not contacted Professional Products. Let's see if they have a CARB-certified intake manifold. ( I think this is a unicorn)
This is what I get for 'knowing' without verifying. I just knew the cutoff for smog was the model year when they went to TBI when I bought this. ::) Bah.
Well, Just have to get on with it. Worse case I will tap the existing holes in the manifold, fill with a low grade bolt, and re-drill at a more correct angle.
I think I can figure out something for a boss for the bolt side and braze it on afterwards.
If only I 'knew' (there is that word again) that IF I bought an aftermarket manifold with an EGR that all would be OK with the smog police. I personally don't see why not but I ran into a similar situation a few years back with a cracked intake manifold and the referee would not budge. OEM, junk it, or TBI were my options.
Again, thanks for the help here. If Professional Products doesn't have what I can use, I will post the ensuing photos for the collective hilarity and head-shaking of the general community.
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Drilling out the 4 center bolt holes in the intake is a simple and easy solution. You can make angled bushings yourself as well.
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Or buy them but it's easy enough to fab something up http://www.jegs.com/p/Professional-Products/Professional-Products-Intake-Manifold-Bushings/2849675/10002/-1