BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Part numbers wanted for valve springs
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 (268 posts) Registered: 04/08/2009 06:50AM Main British Car: Morris Minor Rover V8 |
Re: Part numbers wanted for valve springs
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.
|
MGBV8 Carl Floyd Kingsport, TN (4511 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Part numbers wanted for valve springs
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 (2461 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Part numbers wanted for valve springs
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 (268 posts) Registered: 04/08/2009 06:50AM Main British Car: Morris Minor Rover V8 |
Re: Part numbers wanted for valve springs
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 (2461 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Part numbers wanted for valve springs
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 (4511 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Part numbers wanted for valve springs
|
|
mgb260 Jim Nichols Sequim,WA (2461 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Part numbers wanted for valve springs
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] |
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Part numbers wanted for valve springs
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 |