[C2] Grand Sport intake manifold?
02-01-2019, 12:14 PM
#1
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Grand Sport intake manifold?
This is an extremely rare piece of Corvette racing history. 1 of a very few made. Original magnesium cross ram Hilborn/Kinsler style fuel injection manifold. Legend says this was used at the end of the Corvette Grand Sport program to try to up the HP over the 58mm side draft webers to try to keep pace with the Cobras. Hard telling how many were ever made or exist today. Belongs in a museum or a high end collection or sitting beside one of the most valuable corvettes in the world. Not here in my shop full of Ford parts. Call text or email.=leftcushmancomp@hotmail.com 207 749 3307 $5500.00.
I saw this listed on a local Facebook Swap and Sell site. It's not mine and I don't t know the seller. Downeaster64.
Last edited by Downeaster64; 02-01-2019 at 03:52 PM.
02-01-2019, 03:29 PM
#2
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That is NOT an original Grand Sport manifold.
Grand Sport manifolds were made of aluminum and had pairs of runners Siamesed as they crossed over rather than interleaved as on your manifold.
Your manifold was almost certainly manufactured by L. B. MacKay in southern California for the F5000 engines. It's a neat piece but it's NOT a Grand Sport manifold.
Jim
Grand Sport manifolds were made of aluminum and had pairs of runners Siamesed as they crossed over rather than interleaved as on your manifold.
Your manifold was almost certainly manufactured by L. B. MacKay in southern California for the F5000 engines. It's a neat piece but it's NOT a Grand Sport manifold.
Jim
Last edited by jim lockwood; 02-01-2019 at 04:41 PM.
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02-01-2019, 03:31 PM
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Oh, and BTW, the Grand Sports NEVER had trouble keeping pace with the Cobras.
Quite the opposite.
At Nassau in late 1963, Grand Sports were 11 SECONDS PER LAP faster than the Cobras.
Quite the opposite.
At Nassau in late 1963, Grand Sports were 11 SECONDS PER LAP faster than the Cobras.
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02-01-2019, 10:31 PM
#4
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Back in the mid 70s I worked for Mickey Thompson at his Long Beach Ca, shop. Mickey had stacks of Magnesium small block parts that were left over from his Indy car rear engine Chev small block powered program. I remember seeing complete webber and FI intakes assemblies, heads and compete blocks cast in magnesium. When I left, we were working on a mid-engine single seat off road racer powered by one of those left over Mag Motors. I will look and see if I can find the photos.
I think that intake is left over from the Mickey Thompson Indy car program…....
I think that intake is left over from the Mickey Thompson Indy car program…....
02-01-2019, 11:08 PM
#5
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I have two mag blocks from Mickey's shop. One is NOS, never used and one has small bore sleeves (like an Indy stock block would have) and it has Mickey Thompson stamped on the front and rear of the block. I have seen original GM documents showing dates and quantities of magnesium and aluminum engine blocks and heads cast specifically for Mickey. Document was dated late 1962 which coincides with Mickey's 1963 Indy 500 effort.
Suposedly GM cast 31 mag blocks for Mickey and they were numbered with hand stamps. My NOS one is stamped 31 and the used one is stamped 22.
Suposedly GM cast 31 mag blocks for Mickey and they were numbered with hand stamps. My NOS one is stamped 31 and the used one is stamped 22.
Last edited by Dr L-88; 02-01-2019 at 11:09 PM.
02-02-2019, 07:16 AM
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My information about the use of that manifold on F5000 engines came from a former TRACO employee who was there "back in the day". TRACO built F5000 engines and bought a lot of those manifolds.