Could these exhaust manifolds be from a numbers matching car - Chevelle Tech
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Old Mar 20th, 12, 9:05 PM
Jason1 Jason1 is offline
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Default Could these exhaust manifolds be from a numbers matching car

Hi everyone, i've purchased a 70 chevelle ss that is to be numbers matching. I'm currently tearing it down to get the engine rebuild (the vin in stamped in the front pad) car had 1 repaint and all signs show its original or looks like it. The manufacture date is june 1970 but when pulling the exhaust manifolds they are dated E6 70 (left) and D21 70 (right) would it be normal for the exhaust manifolds to have diff. dates..... 2nd part is could the heads also then have different dates?
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Old Mar 20th, 12, 9:10 PM
keithb keithb is offline
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Default Re: Could these exhaust manifolds be from a numbers matching car

Yes the line workers pulled parts from a big bin. They only cared if it was the correct part for the job.
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Old Mar 21st, 12, 3:19 AM
NickeyChevelle NickeyChevelle is offline
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Default Re: Could these exhaust manifolds be from a numbers matching car

Quote:
Originally Posted by Jason1 View Post
The manufacture date is june 1970
Is that the Assembly Date for the car or the engine? The engine's front pad is stamped with the exact Assembly Date. Obviously the original manifolds couldn't have been cast after the engine assembly date... I'd say 16 days would be a byte much on a small block (since so many were built), they may be okay for a Big Block.
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Old Mar 21st, 12, 9:55 AM
LeoP LeoP is offline
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Default Re: Could these exhaust manifolds be from a numbers matching car

the engine was assembled at the Tonawanda plant and I am pretty sure it had the manifolds installed there, then painted. JMHO.
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Old Mar 21st, 12, 6:27 PM
Jason1 Jason1 is offline
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Default Re: Could these exhaust manifolds be from a numbers matching car

Thanks for the responses, its an oshawa built car....would this also apply towards the heads? i had pulled the covers off a bit a go can't recall the exact dates but they were not the same date... i will be checking dates to make sure and will post.
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Old Mar 24th, 12, 5:44 PM
Verle Verle is offline
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Default Re: Could these exhaust manifolds be from a numbers matching car

Yes, heads are usually different dates. Workers had no interest/incentive to do anything like that. They just used the next available parts.

Exhaust manifolds were installed at the engine plant and were painted when the engine was painted. The paint quickly burned off when the engine was run a little while.
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