I can confirm the 4-hole spacer whistle-fix. I have an edelbrock performer , and with an open edelbrock heat insulator gasket 1/4" thick there was a loud whistle under part throttle, i bougth a 3/16" (i think) 4 hole spacer and that solved all the noise problems.
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Murphy's law - "Anything that can go wrong will go wrong".
-469 ,Butler 310+ Eheads, Hurricane intake portmatched by butler, Butler roller 230/236 @0.50 112 LSA, Johnson lifters, pypes 2 1/2" exhaust, 3.42 yukon duragrip lsd, holley sniper efi, hyperfuel efi tank +++
Last edited by djustice; 08-03-2021 at 09:10 AM.
Reason: cant spell even for love or money :/
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