Help with Olds 307 Project

Olds 307 and 403

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Oct 4, 2018
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What cfm is the Holley carb? It will probably be way rich as is and the square to spread bore adapter as mentioned. He will need stock replacement pushrods for a 85 to 90 Olds 307 Vin Y. They are different as that motor has the taller roller lifters. Surprised a flat tappet doesn't go flat using the roller lifters.
 

yitzac1990

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Oct 21, 2020
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i have no idea what the CFM of the carb is...

I believe the push rods that i had help finding were about 7.7" long....does this sound right?
 

Olds 307 and 403

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Distributor should work fine, be aggressive with the timing. A 600 cfm is plenty big for that 307. The push rods sound right. My regular, no roller cam push rods are just over 8" long. I believe there is about a 1/2" difference between the two.
 

Olds 307 and 403

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What about the 58070 part number? They seem to be the same, just un-coated...
Yes. Quite often there is something like -1 added to the part number for ceramic, this has an actual different part number.
 

yitzac1990

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Oct 21, 2020
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and the square to spread bore adapter as mentioned

Can you give me a part number for the correct adapter? Would the Mr Gasket 1932 work? It will be going on an A5 manifold that I can hopefully grab from Rocketman!

 

Olds 307 and 403

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Yes, that Mr Gasket adapter will work.
 
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