Engine help
#12
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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!).
TZ
TZ
#14
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Join Date: Sep 2013
Location: plymouth, ma
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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
#15
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.
Edit: I agree, the stock high rise dual plane intake with the brass lined ports is a good intake.
#19
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.