Thread: 289 HiPo technical
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Old 05-09-2005, 02:15 AM
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G.R. G.R. is offline
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Join Date: Jul 2001
Location: Evans, CO
Cobra Make, Engine: NAF 289 FIA, 347 stroker with Weber 48's, building a '48 Anglia gasser, driving a '55 Chevy resto-rod
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I'm in the process of rebuilding my top end. I floated an intake valve due to a broken retainer. Luckily the valve just"kissed "the piston, no damage) and there was no damage to the lower end.

I have the 289 HI-Po heads with screw in studs and damper valve springs. These were a weak link ,corrected in the Boss 302, in the 289 due to the guide design and one piece retainer on the valve springs. Over revving and high Rpm were the weak link destroying many an engine.

I'm going with Edlebrock Aluminum heads to match the RPM performer manifold. Still haven't decided on a cam
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