Valves Can you please advise me on which chev valves you guys use as replacement valves my engine is a 1951 C1BA
Thanks in advance Granny |
Re: Valves The 1.5 and 1.6 SBC valves Have the same stem diameter, but are about .060" longer. Which makes them ideal to use with hi lift cams like the L-100. The 1.72 valve can be used in the untake, but I don't see the benefit of using it in a street engine.
Gramps |
Re: Valves Thanks Gramps for that
Granny |
Re: Valves An advantage of the 1.6" valve is it gets the valve up higher in a seat that has been ground too deep. In effect that unshrouds the valve and gives a little more effective lift.
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Re: Valves Another advantage is you can get top quality hi flow valves for Chevy much cheaper than the flathead version.
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Here is an example of a Manley Performance Chevy valve with a 1.600 head OD, .240 stem OD, 4.84 OAL.
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Re: Valves Back in my yut I did allot of valve jobs. Put one or more 1.5 valves in theseol flat motors just to fix a bad seat.
G |
Re: Valves I have a set of those Manley Chevy valves for sale on the EV8 swap meet site, also at Hershey, C4S-35 Mon.-Thurs.
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Re: Valves Hi russcc, Thanks for your info but I live down under so will not be at Hershey and the shipping cost to here would near double the Cost
Granny |
Re: Valves In our shop we use the Chevy valves in rebuilds to match the hardened seats we install.
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ot sure when the 1.6 valve was introduced , the 1.5 cost $2.95 and the 1.6 was 5.95. So 16 valves was quite expensive when running a hi lift cam. I didn't see the reason to run them in the exhaust unless the deats were bad. Replacing the seats wasalso very expensive to do it right. You have to understand, money was in short supply raising 4 kids, and the price of adj lifters went up to over 20 bucks a set. so I build allot of engines for other people. My favorit engine back then was the Olds 370ci engine, another reason you couldn't use the stock trans and rear end. The La Sall trans got scarce, but the Caddy boxes were only 20/30 bucks, but you had to buy a Hurst shifter anothe 50 bucks shot. So you can see why racing was expensive. Then waz the good ol days Gramps |
Re: Valves There is quite a range of Chevy valves. From budget replacement to Serve Duty. The price goes up accordingly. I'd try to find ones with undercut stems under the head to give you maximum flow.
If you really want to get slick, have someone taper and install bronze inserts into the valve guides to also improve flow into the port. Inserts just improve wear and help to prevent sticking valves. |
Re: Valves Yes Bronz incert are best, but expensive. Just knurl the cast iron guides, much cheaper, and will last as long as the rings do. There must be a reaon for every modification, and not for spending money.
Gramps PS thats why I don't use 1.6 valves in a street engine. |
Re: Valves Ntt
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Re: Valves Can some one please give me part number for the 1.5 chevy values they use it their rebuilds
Thanks in advance Granny |
Re: Valves 4 Attachment(s)
Just so everybody thinks it all the way through. When you lengthen the stem, you also lengthen the installed length/height of the valve spring. So, make sure you have your valve springs tested and know at what installed height they need to be to deliver the correct LBs on the seat.
I frequently use Isky 185G springs on my high-performance builds and I take a steel Chevy valve retainer and cut it back for the 185G springs. The retainer is much thicker than the stock 49-53 ones, so it helps take up the longer spring distance of the 1.6 valves. Also, when buying new 49-53 style valve guides, it is best to have the exhaust guides that do NOT have the intake seal groove cut into them. Why? Well, the more surface area on the valve guide OD, the better heat transfer from the exhaust valve into the block - this is important for valve cooling (exhaust side). You'll see a 'solid' type exhaust guide below. I also make aluminum 'spacers' to put against the guide to set the final installed height. I don't like stacking up 3 or 4 .060 spring shims (I'm a bit picky): Attachment 500448 Attachment 500449 Attachment 500451 Attachment 500450 |
Re: Valves This is all very good information, Pay attention here!
Gramps |
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