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flatchatcharlie
rice boy
Joined: 08 Nov 2002
Posts: 38
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 Posted: Mon Nov 11, 2002 11:30 pm Post subject: big valve bullshit |
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| after reading several posts on big valve heads I thought I had the information to find one (the 7,14,21 rule and the 00....number on the inlet valve ) As my gem heads were still on motors I looked for the 7,14,21 numbers I only have 5,6,20,23 how unlucky is that!so I thought I was going to have to buy another when curiosity got the better of me and I decided to pull on off to check.the number on the head was 23 the number on the inlet valve was 05977 so by the rules that proved it was n't a big valve head.Then I decided to mesure the valves because they did look rather big.Guess what the inlet messures 42mm the exhaust 34mm a big valve head so the two rules mentioned above dont mean a thing the head did come from a TX though.Now I have my big valve head I can start porting and the 32/36 webber conversion hopefully I'll have it done by the time my g200 comes back from the machine shop! |
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Gold TX Sleeper
backyard mechanic
Joined: 05 Feb 2002
Posts: 509
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| Posted: Tue Nov 12, 2002 4:26 am Post subject: Re: big valve bullshit |
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| It's possible that a previous owner of the head has fitted the larger valves. Do you have any history of it? (the head). |
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Adam
Site Admin
Joined: 04 Oct 2001
Posts: 682
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| Posted: Tue Nov 12, 2002 3:39 pm Post subject: Re: big valve misquotes |
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Methinks you have made a very simplistic assumption, my original comment (now taken massively out of context) was that a 7,14,21 etc.. should be a big valve head. Feel free to correct me...
What I didn't say but what you've incorrectly assumed is that this means that heads WITHOUT these numbers DON'T have the larger inlet valves...
Does this make sense? |
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flatchatcharlie
rice boy
Joined: 08 Nov 2002
Posts: 38
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| Posted: Tue Nov 12, 2002 6:38 pm Post subject: Re: big valve misquotes |
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| Yes that makes sense but its not just your post that says it.Many posts make the same statement with out clarifying that not all big valve heads have these numbers |
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flatchatcharlie
rice boy
Joined: 08 Nov 2002
Posts: 38
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| Posted: Tue Nov 12, 2002 6:43 pm Post subject: Re: big valve bullshit |
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| I know the car has done pizza deliveries for 7 years it was rebuilt then and lasted till I took it in a burnout comp.The ports messure bigger and the combustion chamber is smaller so I tend to belive these valves would be originally in this head. |
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rob_w
tinkerer
Joined: 19 Feb 2002
Posts: 395
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| Posted: Tue Nov 12, 2002 10:01 pm Post subject: Re: big valve bullshit |
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well, i had a tx for a while, and although it had the small valve head, it was match ported and had huge valves..
i guess you just gotta check everything carefully, and go with what youve got.
rob. |
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