Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

Go to Thread: PreviousNext
Go to: Forum ListMessage ListNew TopicLog In


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5812 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Part numbers wanted for valve springs
Posted by: BlownMGB-V8
Date: May 27, 2019 10:15AM

I expect some of you will have some favorites. I'm looking for a drop-in replacement for the BOPR heads, (specifically 300 heads but the dimensions are the same) that are capable of operating up to 7,000 rpm without being overly stiff. Not looking for beehive springs or something that will require cutting the seats to fit. Just something similar to stock but a bit stiffer. My guess is that there should be any number of SBC springs that would work.

Jim


minorv8
Jukka Harkola

(161 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Part numbers wanted for valve springs
Posted by: minorv8
Date: May 28, 2019 01:26AM

I have also tried to find suitable ones but usually the problem is the fitted height. Especially if you have even a slightly uprated cam. IIRC Kent Cams do a set of both single (part no. VS44) and dual springs (VS43) but they are pretty expensive. Around 200 for single set and 250 for duals in UK. Duals need machining.


Kent Cams Rover V8 springs.jpg


MGBV8
Carl Floyd
Kingsport, TN
(3726 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Part numbers wanted for valve springs
Posted by: MGBV8
Date: May 28, 2019 08:24PM

I was thinking SBC Z28 springs. Seven grand might be a bit much, though.

How much lift do they have to endure?


mgb260
Jim Nichols
Sequim,WA
(1974 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Part numbers wanted for valve springs
Posted by: mgb260
Date: May 28, 2019 08:46PM

The Z28 springs work good with slightly taller valve like the 2.3 SOHC Pinto valves. You would have to lower the seats in the head or use locks to lift the retainers higher with the short Buick/Rover valves. Good to 6500RPM and a little over .500 lift.


minorv8
Jukka Harkola

(161 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Part numbers wanted for valve springs
Posted by: minorv8
Date: May 29, 2019 12:26AM

Are there Buick type 10 degree locks available with different heights ? Machining the seats in order to compensate short valves / taller springs does not really make any sense.


mgb260
Jim Nichols
Sequim,WA
(1974 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Part numbers wanted for valve springs
Posted by: mgb260
Date: May 29, 2019 01:37AM

Jukka, That is why I have always used the taller valves and shimmed the rocker stands to compensate. It also requires longer pushrods for proper geometry. The Buick valves should be 7 degrees like Chevy. I don't know about Rover, they may be 10 degrees.


MGBV8
Carl Floyd
Kingsport, TN
(3726 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Part numbers wanted for valve springs
Posted by: MGBV8
Date: May 29, 2019 11:27AM

These should do it.

[sdparts.com]

Or these.

[www.summitracing.com]



mgb260
Jim Nichols
Sequim,WA
(1974 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Part numbers wanted for valve springs
Posted by: mgb260
Date: May 29, 2019 12:34PM

These have a shorter installed height and can't beat the price. You would probably need Chevy retainers but try the Buick one's to see if they will work.

[www.alexsparts.com]


MGBV8
Carl Floyd
Kingsport, TN
(3726 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Part numbers wanted for valve springs
Posted by: MGBV8
Date: May 29, 2019 12:50PM

Lift & installed height would be helpful, Jim B.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5812 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Part numbers wanted for valve springs
Posted by: BlownMGB-V8
Date: May 29, 2019 11:58PM

Valve lift is .436". It appears 1.727" is the factory spec for installed height, showing 64lbs of seated pressure, so I'd think those last Z28 springs should work, might need a shim to raise the spring pressure a bit. I think I'd like to see something around 120 seated, 350 open. The price is certainly right.

Jim


Sorry, only registered users may post in this forum.