big block valve wsprings

[Clem Z.]

Re: big block valve wsprings

F/M lists a valve spring VS1581 that looks close

[Keith B.]

Re: big block valve wsprings

what are the valve springs used on the new Chevy BB crate engines

[Duke W.]

Re: big block valve wsprings

F/M lists a valve spring VS1581 that looks close

The napaonline.com buyer's guide lists it for use on what looks like all big blocks from '65 into the seventies, so it appears to be an OE replacement, but unfortunately no force/rate data is listed for it.

Someone will have to buy one and have it tested to be sure.

It's a dual spring with a damper sandwiched between the two springs... interesting.

Duke

[Clem Z.]

Re: big block valve wsprings

The napaonline.com buyer's guide lists it for use on what looks like all big blocks from '65 into the seventies, so it appears to be an OE replacement, but unfortunately no force/rate data is listed for it.

Someone will have to buy one and have it tested to be sure.

It's a dual spring with a damper sandwiched between the two springs... interesting.

Duke

105#@1.880, 370 #/inch

[Clem Z.]

Re: big block valve wsprings

here you go on the valve springs. zoom to 200% and you can read the page

[Duke W.]

Re: big block valve wsprings

I can't read all the data regardless of magnfication. Some it too blurred. Can you write it out?

Duke

[Jerry G.]

Re: big block valve wsprings

Clem
What about a modern Beehive spring for this appilcation? GM likes them now in their HP motors? Jerry

[Clem Z.]

Re: big block valve wsprings

VS1581,dual spring/damper ,OD 1.460, max lift .620, closed pressure 105#@1.880, coil bind 1.200, #/inch 370, open pressure 338@1.250

[Clem Z.]

Re: big block valve wsprings

Clem
What about a modern Beehive spring for this appilcation? GM likes them now in their HP motors? Jerry

they should work but i am not sure of what is available

[William F.]

Re: big block valve wsprings

If I replace the first desing valve springs, seals, locks, should I replace other components such as new (GM or aftermarket such as Lunati) pushrods, rocker arms, etc.?
Thanks

[Clem Z.]

Re: big block valve wsprings

also if you use the spring with the flat wound damper make sure the valve spring shim you use is hardened as these flat wound damper will cut into any metal that is not hardened. you can use a file to check to make sure the shims are hardened and the ones sold by GM are hardened

[Clem Z.]

Re: big block valve wsprings

If I replace the first desing valve springs, seals, locks, should I replace other components such as new (GM or aftermarket such as Lunati) pushrods, rocker arms, etc.?
Thanks

no if they show no sighs of wear. also keep the parts together as they come out of the engine so there is no breakin required.

[Wayne M.]

Re: big block valve wsprings

From How-to-Hotrod BB Chev's (1972 issue); they only concern themselves with hi-perf GM items.

There was another 396/427 spring (not shown) #3856860 (w/damper) for Passenger BB's (exc. Sp. H/Per.) starting in '65 and covering all low-perf 396 passenger up to '69, and even the low-perf '69 427 (from my P&A catalog July '69 Rev.).

I'm sure that if there were reliability problems, this spring would have been replaced during that timeframe. I do see that it's gone from my Jan '70 P&A catalogs, though, replaced by the 3859911.



y

[Dick W.]

Re: big block valve wsprings

From How-to-Hotrod BB Chev's (1972 issue); they only concern themselves with hi-perf GM items.

There was another 396/427 spring (not shown) #3856860 (w/damper) for Passenger BB's (exc. Sp. H/Per.) starting in '65 and covering all low-perf 396 passenger up to '69, and even the low-perf '69 427 (from my P&A catalog July '69 Rev.).

I'm sure that if there were reliability problems, this spring would have been replaced during that timeframe.

There were some awful slow learners at GM during that time period. If they had inventory in the warehouse, it most likely would have been used up before they replaced it. Plus the communication pipeline between dealers, factory service rep's, engineers, etc is not what it is today

[Don L.]

Re: big block valve wsprings

You might also consider looking at http://racingsprings.com/Multimedia/...talog_2012.pdf or on catalog www.racingsprings.com

They offer several springs that could be possibly retro fit to the engine. While they don't offer application information I know the PAC-1212X spring will retrofit into the LT engine group. For further information you can contact Matt Milkovich as I have worked with him in the past on similar retrofit discussions.