Quick Question about PTV Clearance on my Set-up-
Quick Question about PTV Clearance on my Set-up- I curently have a TSP 233/239 .598/.603 112+2 LSA R2 Cam in my car, I am going to get some TSP Stg 2.5 5.3l heads (Might get the 317+ cfm "R" version) but need to know whats the LOWEST CC size and SMALLEST head gasket I can go with WITHOUT flycutting. 59cc w/ cometic .040. head gasket ok?? What will my DCR and SCR be at with that? I have moslty 91 octane in my area so keep that in mind, 93 is another 40 cents a gallon 
. Thanks guys.
. Thanks guys. Just the person I wanted to answer. I already have them cam but what you are saying is I cannot have the heads milled down or run .040 gaskets? Only GM MLS gaskets? Any idea what my compression ratio will be at?
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Joined: Mar 2004
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From: BFE
Dont know man, its going to be the ones from TSP. I will try to find out real quick.....
***Edit- their website does not list it but I want to say they are a 62 or 64cc???
***Edit- their website does not list it but I want to say they are a 62 or 64cc???
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TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
that .2 increment in scr doesn't warrant the loss of PTV if you ask me and to get 11:1 you need 61.4cc chambers. Of course you can get the 5.3L with sunken valve, but that is another story, I'm not an advocate of those either.
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Verdad Gallardo Ok then, I will have TSP take them down to 62CC (or 61cc if I can even get away with that, I will ask them when I call) and use stock GM MLS gaskets. Now a quick question about pushrods, you were the one that told me to get 7.425's a while back for my cam only (and they worked GREAT, I have VERY LITTLE valvetrain noise), what size will I need now? 7.400's? Thanks again.
Last edited by LS1C5Vette; May 19, 2008 at 09:40 PM.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
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From: BFE
Mechanical overev has no safety.
I mean that you'll have enough PTV margin in case you encounter any anomaly in your valvetrain (valve float, for exemple) the piston has enough space to be forgiving.
I mean that you'll have enough PTV margin in case you encounter any anomaly in your valvetrain (valve float, for exemple) the piston has enough space to be forgiving.
Here is one for you, what about leaving the 5.3l heads the stock CC size (TSP said they would do a LIGHT mill just to make sure the surface is even) and running a Cometic .045 gasket?
