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Old 06-16-2016, 03:34 PM
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I just figured its over 25 years old and wouldn't hurt to be replaced. Thanks maybe ill just paint it or powdercoat it.
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Old 06-16-2016, 03:37 PM
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If the water passages look decent, then no biggie there. Just clean her up, paint/powderccoat and let her go. That'll save you some money for other things (a retro-fit hydraulic roller would compliment the heads nicely!).

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Old 06-16-2016, 05:18 PM
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Be sure to check the metal straight below the t-stat.on the floor of the manifold real good.
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Old 06-21-2016, 02:28 PM
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Trying to find the right head.... can anyone tell me what the chamber size in the heads is? if its open chamber or closed? and what the combustion chamber cc is? I can take it apart and put it back together but havnt a clue to any of this. Gen IV 454 mag rectangle port heads. Thanks in advance
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Old 06-21-2016, 02:34 PM
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They are 188s, open chamber, 121cc (sometimes this is may be advertised as 118cc I think, but typically cc at 121). 2.19/1.88 valves, 320-325cc intake runner port.

Edit: I agree, the stock high rise dual plane intake with the brass lined ports is a good intake.
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Old 06-23-2016, 04:10 PM
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Thanks for the help guys. Went with a pair of dart iron eagles and edelbrock air gap manifold. Will be doing a roller cam this winter.
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Old 06-23-2016, 06:21 PM
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I am running 308 eagles as well.
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Old 06-23-2016, 06:28 PM
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Did you notice any power increase with them? Or are you running a roller setup already? Also did you have to measure pushrods or did stock work?
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Old 06-23-2016, 06:41 PM
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You will need longer pushrods. Yes they make more power, much better head than the stock gm, but I have other upgrades including roller cams. I am running mid 70s with more tuning needed. Boat ran 68 with stock 420s.
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Old 06-23-2016, 06:56 PM
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Thanks for the help! Parts will be in Monday I'll let you guys know how she turns out.
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