Engine and Transmission Tech
tips, technology, tools and techniques related to vehicle driveline components
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Cadillac 4.9L in an LBC ?
Maybe it's worth considering ? 22,75" OAL, including accessories ! Torque is good for street machines and this does quite well. Popular in Fieros, why not in LBC's ?
Let's discuss, Art. |
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mgb260 Jim Nichols Sequim,WA (2463 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Cadillac 4.9L in an LBC ?
My project is being resurrected again for my 15 year old grandson. Doing structural floor and rocker work now. Probably 4.9 Caddy with V6 60 degree 700 R4 at first but I already have a Jeep AW4 too. You can also use a 200 R4 with Speedway adapter. Stay tuned!
Edited 1 time(s). Last edit at 10/16/2023 04:53PM by mgb260. |
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MGBV8 Carl Floyd Kingsport, TN (4514 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Cadillac 4.9L in an LBC ?
Refresher course.
[forum.britishv8.org] I just spent a good part of the morning rereading that entire 11 page thread. Jim Nichols has compiled a fantastic amount of information on Caddy 4.9L mods! Edited 1 time(s). Last edit at 10/18/2023 10:48AM by MGBV8. |
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Re: Cadillac 4.9L in an LBC ?
Nice work Jim ! Did you use the 4.5L. intake manifold for the 4 bbl.? It appears the rod journals have " hydraulically rolled fillets".
I found KB pistons and billet rods that should work. My round lobe, RV8 cam blanks might be modded to fit. This engine begs for a good alumium head ! Onward, Art. |
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mgb260 Jim Nichols Sequim,WA (2463 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Cadillac 4.9L in an LBC ?
Art, That is one of John's Performance motors. He used an adapter from TBI to 4 barrel. The 88-90 4.5 have the TBI and straight valve covers. 4.1 had painted or chrome straight valve covers. The 91-95 4.9 has the same TBI pattern but you have to plug the injector holes with pipe plugs. Here is the adapter: [khaosmotorsports.com]
Edited 1 time(s). Last edit at 10/19/2023 12:10AM by mgb260. |
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Cadillac 4.9L in an LBC ?
Not a fan I'm afraid, it appears to have a number of questionable design features that I'm just not happy with, and that look like they would be difficult or impossible to change. Things like the small oil passages in the filter adapter and the cantilevered design of the rocker support bar come immediately to mind as worrying for any sort of performance build. For the MGB I think the Rover is a better bet and in the same weight and displacement range with lots of aftermarket support.
Having said that I'd take a Buick 300 over either of them. I'm not just saying that, I sincerely do believe it is a better fit for the car. Jim |
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mgb260 Jim Nichols Sequim,WA (2463 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Cadillac 4.9L in an LBC ?
The 4.1 (4100) had a lot of issues. Most were fixed by the time the 4.5 came out in 88. I do like the chrome valve covers and oil pan, also the water pump and exhaust manifold. The valve covers can retrofit to the 4.5. There are other parts that may help a longitudinal swap. The rocker bar issue is solved by machining a notch for pedestal rockers and better bolts. The 4.9 oil pump should be used in the 4.5, gerotor type with more volume and pressure, less load on distributor.
Edited 2 time(s). Last edit at 10/19/2023 08:09PM by mgb260. |
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mgb260 Jim Nichols Sequim,WA (2463 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Cadillac 4.9L in an LBC ?
I like the 300 Buick too, but age and scarcity has taken it's toll. car-part.com wrecking yard search of entire country list eight, but 13 pages of 4.9 Cadillac.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Cadillac 4.9L in an LBC ?
Looking in the wrong places. TA has a list of warehouses around the country who have old Buick engines and parts. I just sent them an email asking if they will share that list, we'll see how they answer.
Jim Edited 1 time(s). Last edit at 10/20/2023 11:43AM by BlownMGB-V8. |
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MGBV8 Carl Floyd Kingsport, TN (4514 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Cadillac 4.9L in an LBC ?
From Hemmings in 2018:
Buick Parts Resources [www.hemmings.com] [www.hemmings.com] [www.hemmings.com] Edited 1 time(s). Last edit at 10/20/2023 12:15PM by MGBV8. |
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Re: Cadillac 4.9L in an LBC ?
Loyalty vs. engineering : The reality is, the RV8 , Buick V6 and SBB are based on engineering of 1960 +/-. Seemingly Rover dolled-out improvements as a must. Their larger bore with aluminum core shift is a basic problem.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Cadillac 4.9L in an LBC ?
Not really Art. Upgrades are available for those who want them. Surely there must be something better than that single plane above? Such Tiny throttle bores.
Jim |
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Re: Cadillac 4.9L in an LBC ?
Reportedly the 60 deg., V6 flywheel can be re-drilled to fit the Cad. Try SBF hedders, modded to fit. New oil pan , $20. on Rock Auto. Cylinders are cheaper/easier to bore and hone. What if there was a SOHC head available soon ? Got a lathe, make your own aluminum flywheel, with Fidanza steel insert.
Onward, Art. |
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