[DeTomaso] Exhaust popping

[Mirril McMullen]

Fred,

Pretty sure mine leaked in the same spot.

I got rid of them and went with the Euro setup (before going 180s).

I sold the BBs to a POCA member and he found the leaks.

I sent his money back and not sure what he did with them.

/\/\

#6859 WAYBAC

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf
Of Fred Foreman
Sent: Tuesday, April 7, 2020 10:55 AM
To: detomaso at server.detomasolist.com
Subject: [DeTomaso] Exhaust popping

After buying my Pantera, I had exhaust popping on deceleration with Hall
"big bore" exhaust.  I was told about exhaust leaks too.
On checking over the system I found on #3 & #4 cylinders a black mark from
leakage where the headers meet the cylinder head.  Removing the headers on
that side showed that the header flange plate did not completely cover the
corner of the exhaust port opening and the result was a burned thru corner
and flange leakage.  So, My header primaries are much smaller than the
cylinder head exhaust ports.
The correction was to weld up a bit on the edge of the flange plate to make
it a wee bit taller and file it for a smooth sealing surface.

I have always wondered if my headers were really "big bore" or "little
bore".  Does Hall make headers for 2 barrel heads with smaller ports?
Fred Foreman
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