Author Topic: correct exhaust manifolds #s for a 68 mo 302 wo air  (Read 4753 times)

jonboy1216

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correct exhaust manifolds #s for a 68 mo 302 wo air
« on: March 23, 2009, 05:13:23 AM »
my book has a bunch of different casting numbers that could work   mo  block was a april 17 68 build date if this helps

bertfam

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Re: correct exhaust manifolds #s for a 68 mo 302 wo air
« Reply #1 on: March 23, 2009, 02:08:47 PM »
Well, the problem is that your car would have come with the AIR pump, so you're looking for something that didn't exist.

However, if you want exhaust manifolds without the holes that will fit, then you could go with the earlier applications 3840912 or 3893608 (Right) and 3892679 (left). They're fit, but they won't be "correct".

Ed

jonboy1216

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Re: correct exhaust manifolds #s for a 68 mo 302 wo air
« Reply #2 on: March 24, 2009, 02:16:23 AM »
thanks for the info a 67 mo wouldnt have come with air right?

Gramps69Z

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Re: correct exhaust manifolds #s for a 68 mo 302 wo air
« Reply #3 on: March 24, 2009, 03:02:49 AM »
No "factory" 1st generation Z/28's came with air conditioning.
Captain John Wykoff
Destin Fire:   October 31, 2015 at 0700--Officially Retired

bertfam

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Re: correct exhaust manifolds #s for a 68 mo 302 wo air
« Reply #4 on: March 24, 2009, 03:38:40 AM »
John, I think he means A.I.R (smog), not A/C.

Not quite jonboy. As per Kurt's "1967-69 EMISSION SYSTEM" report, in 1967 (as in 1966), emissions equipment was required only on cars sold in California. The California cars were fitted with an AIR system (Regular Production Option (RPO) K19), and the PCV system (RPO K24). All engines equipped with K19 had unique engine codes due to the required holes in the exhaust manifold(s). Also, the L26 (230 ci L6) engines with K19 used a different distributor and the L30 (327 / 275hp) engines with K19 had a different initial timing. Note that smog equipment was not required on cars built in California but intended for sale in other states.

Ed

jonboy1216

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Re: correct exhaust manifolds #s for a 68 mo 302 wo air
« Reply #5 on: March 24, 2009, 08:10:52 PM »
thanks bertfam so what would be the correct casting #S maniflods on a april 17 of 68 built MO block without the air injection system?

bertfam

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Re: correct exhaust manifolds #s for a 68 mo 302 wo air
« Reply #6 on: March 24, 2009, 08:17:23 PM »
Like I said before, there's not such thing. All 1968 Camaro small block cars with a manual transmission came with A.I.R. so you need the manifolds with the holes to be "correct". If you don't care about being "correct", then you can use one of the numbers listed above.

Ed

Jerry@CHP

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Re: correct exhaust manifolds #s for a 68 mo 302 wo air
« Reply #7 on: March 26, 2009, 12:05:22 PM »
I also have the GM diverter valve and emissions chart in my 67-68 Z28 Camaro book, calls out all applications.

Jerry

 

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