Valve spring specs

[46CHF]

Building a 47 chief bonneville, can anyone provide installed height and installed height spring pressure also open or full lift spring pressure

[Yellow53Chief]

Hi,
Jim Mosher of performanceindian.com has one of the better if not the best discussion of valve springs and their specifications on his website. A true Bonneville set-up used inner springs as well as the outer springs. The combination will help prevent valve float, but the the combination also puts a lot of strain on the valve train. If you are looking for maximum RPM performance, inner springs will help. For regular every day riding; inner springs provide little benefit and may shorten the valve train's life.

[cdf6333]

I've been using 70's 500 ci Cadillac V8 valve springs for over 40 years and there isn't a better spring made. They're part # VS-773 in TRW or RV-619S in Elgin. ( They're all made by the same Co anyway) You can buy em on eBay for about $3 each. They're progressively wound like all modern auto, truck or cycle springs and the "tighter" ( closer together) coils go against the cylinder. I have then in many many engines and have 55,000 miles on them in my 46 Chief. You'll love em! F those old used inner springs, I never opened up a Bonne motor without those being broken.

[tfburke3]

I've been using 70's 500 ci Cadillac V8 valve springs for over 40 years and there isn't a better spring made. They're part # VS-773 in TRW or RV-619S in Elgin. ( They're all made by the same Co anyway) You can buy em on eBay for about $3 each. They're progressively wound like all modern auto, truck or cycle springs and the "tighter" ( closer together) coils go against the cylinder. I have then in many many engines and have 55,000 miles on them in my 46 Chief. You'll love em! F those old used inner springs, I never opened up a Bonne motor without those being broken.

Hey Bob,
What closed pressure are you setting up for?
Tom Burke

[cdf6333]

Tom I lost the specs as I did this in the early 80's while I had the auto machine shop. I had the spring testing tool which I sold to Belgium when I closed the shop. I put these in all the motors I do, which is still 2-5 a year.
try em, you'll love them! They're perfectly square ( end-to-end) which makes the valve stem and guides last longer and they have a decent anti-rust coating. They're very forgiving as to installed length, don't bother shimming no matter how deep the seats are sunk. \

[tfburke3]

Tom I lost the specs as I did this in the early 80's while I had the auto machine shop. I had the spring testing tool which I sold to Belgium when I closed the shop. I put these in all the motors I do, which is still 2-5 a year.
try em, you'll love them! They're perfectly square ( end-to-end) which makes the valve stem and guides last longer and they have a decent anti-rust coating. They're very forgiving as to installed length, don't bother shimming no matter how deep the seats are sunk. \

Thanks,maybe I will try a set for next valve job
Tom