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Old 03-24-2022, 11:21 AM   #155
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What's the casting number on those heads? Can not make the # out in the pic. Those are a closed chamber type head! That is good! Need the casting #'s. Seats, guides, 3 angle valve job and bowl posting will make a huge improvement with the thin 0.027 head gaskets!
Do yourself a favor include these head gaskets in your budget from Summit racing, you will need a pair of them!!!
: https://www.summitracing.com/search/...ss-in/0-027-in

Miss print in the post "bowl posting"
meant Bowl porting - hogging it out and valve guide relief! Just ask and I will provide the info..
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Old 03-24-2022, 06:14 PM   #156
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What's the casting number on those heads? Can not make the # out in the pic. Those are a closed chamber type head! That is good! Need the casting #'s. Seats, guides, 3 angle valve job and bowl posting will make a huge improvement with the thin 0.027 head gaskets!
Do yourself a favor include these head gaskets in your budget from Summit racing, you will need a pair of them!!!
: https://www.summitracing.com/search/...ss-in/0-027-in
Numbers on the top sideClick image for larger version

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Old 03-25-2022, 09:40 AM   #157
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I'll look them up for you!! Might be this weekend, super busy in my shop!!!
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Old 03-25-2022, 09:49 AM   #158
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Do try to get a measurement of a piston at TDC and the deck height (top of piston to top of the engine block). Most likely between 0.040 ~0.070 this way the static compression & quench can be figured out!
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Old 03-26-2022, 08:47 AM   #159
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The heads you have (265239) are from 1966 came on the 273 LA engine. Very desirable & rare over what was stock on that engine open chamber heads! You saved some $$$ on that!!! I see someone had the valve seats change in the past. Have you machine shop replace the exhaust seats with stelllite hardened seats, do a 3 angle valve job & back cut the valve face. Minor bowl porting rely makes these heads flow well for a RV application. idle to 3500 RPM's. The heads should be measured to see how much has been surfaced off in the past. Do check your engine block to see what size it is? On the side of the block in bold casting is the engine size. Do measure your bore size and piston deck height! Do post a picture of the pistons!!! Like to see whats in there...
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Old 03-26-2022, 09:04 AM   #160
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It was common in the past to mill those #234 heads 0.040 to lower the combustion chamber CC's to raise compression. The head thickness is very important!! (this must be done) If milled too much the intake to block angle is off - this causes problems with the intake sealing!! All so need the piston deck height for the proper head gasket thickness!! Need to see if you have flat top pistons or pistons with valve reliefs.
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