Howdy,
If you want the backstory on the portion markings (S//NP), check out my LSR section thread.
I'm decided to go racing and chase some small displacement Classic records. Since I'm not planning on racing this year, I'm still trying to get the Riviera cruiseable, and I put my family ahead of this hobby; I'm taking the slow route of getting it together. Much like TSB and his OHC Six thread starting with an engine and a car joining later, I'll add the 81 Regal that'll be the home of this motor at some point in the future.
Basic Specs:
Block, just agreed to buy a complete 70K mile 82 Grand Prix motor complete from a guy who's changing directions with a 4x4 project.
Crank, modified 3.0L OEM crank. Rods turned down to 2.20 from 2.25 and a solid radius put on the crank to strengthen it. It's a 2.66in stroke vs. the 3.40 of a 3.8L.
Rods, 6.385in BBC rods narrowed to fit the Buick journals and the small ends offset bushed down to 0.927 SBC pins and to bring the C-C length down to ~6.375. The slop is dependent on the final deck height to nail the 0.040in piston to head clearance with the 0.035in gaskets.
Pistons, old BMS TRW flattops in 3.800in bore. Old school, heavy, but near indestructable.
Heads, some form of stock heads. I have home ported (maybe butchered) GN heads and a set of complete older heads, a set of 1.745/1.5 SS valves (oversized). Will probably have beehive springs and Ti retainers to keep the valvetrain stable at rpm.
Intake, massaged 4.1L OEM intake with an spreadbore adapter for a 600cfm double pumper modified for blow through. Steve Morris Engines carb bonnet with as tall of a spacer under the bonnet as I can fit to get the air straight before the carb.
Headers, KB/ATR style units since I like the cross over design better than the stockers.
Turbo, stock GN turbo. Already have one and it's good for 300hp and still spool on the low end. Might upgrade depending on performance.
Variables:
Cam, solid roller but since they are billet and expensive, I'm working with a big Turbo6 builder on seeing if he can fine a good used one that fits the application.
Rockers, definately rollers to keep them stable at rpm but ratio will likely be determined by either a used set coming available or coilbind on the springs.
Oiling, getting my hands on a mid 90's Rover timing cover that has a gerotor pump in it to experiment with. Definately going to add extra oil returns to the pan from the heads. Might block off the lifter valley to keep the drainback off of the rotating assembly.
Flexplate, probably a custom unit, depends on the crank pattern compared to the RWD parts and balance factors.
Block stability, thinking about doing a half fill on the block and/or adding a steel girdle to try and increase the crank's stability. The builder I'm working with doesn't like girdles, he doesn't think they add much to strengthening the main webs which are the block weakness. Haven't asked him about hardblock on a well seasoned block.
Well this has gone on long enough, I'll get pictures of a good cross section of my parts tomorrow just because.
If you want the backstory on the portion markings (S//NP), check out my LSR section thread.
I'm decided to go racing and chase some small displacement Classic records. Since I'm not planning on racing this year, I'm still trying to get the Riviera cruiseable, and I put my family ahead of this hobby; I'm taking the slow route of getting it together. Much like TSB and his OHC Six thread starting with an engine and a car joining later, I'll add the 81 Regal that'll be the home of this motor at some point in the future.
Basic Specs:
Block, just agreed to buy a complete 70K mile 82 Grand Prix motor complete from a guy who's changing directions with a 4x4 project.
Crank, modified 3.0L OEM crank. Rods turned down to 2.20 from 2.25 and a solid radius put on the crank to strengthen it. It's a 2.66in stroke vs. the 3.40 of a 3.8L.
Rods, 6.385in BBC rods narrowed to fit the Buick journals and the small ends offset bushed down to 0.927 SBC pins and to bring the C-C length down to ~6.375. The slop is dependent on the final deck height to nail the 0.040in piston to head clearance with the 0.035in gaskets.
Pistons, old BMS TRW flattops in 3.800in bore. Old school, heavy, but near indestructable.
Heads, some form of stock heads. I have home ported (maybe butchered) GN heads and a set of complete older heads, a set of 1.745/1.5 SS valves (oversized). Will probably have beehive springs and Ti retainers to keep the valvetrain stable at rpm.
Intake, massaged 4.1L OEM intake with an spreadbore adapter for a 600cfm double pumper modified for blow through. Steve Morris Engines carb bonnet with as tall of a spacer under the bonnet as I can fit to get the air straight before the carb.
Headers, KB/ATR style units since I like the cross over design better than the stockers.
Turbo, stock GN turbo. Already have one and it's good for 300hp and still spool on the low end. Might upgrade depending on performance.
Variables:
Cam, solid roller but since they are billet and expensive, I'm working with a big Turbo6 builder on seeing if he can fine a good used one that fits the application.
Rockers, definately rollers to keep them stable at rpm but ratio will likely be determined by either a used set coming available or coilbind on the springs.
Oiling, getting my hands on a mid 90's Rover timing cover that has a gerotor pump in it to experiment with. Definately going to add extra oil returns to the pan from the heads. Might block off the lifter valley to keep the drainback off of the rotating assembly.
Flexplate, probably a custom unit, depends on the crank pattern compared to the RWD parts and balance factors.
Block stability, thinking about doing a half fill on the block and/or adding a steel girdle to try and increase the crank's stability. The builder I'm working with doesn't like girdles, he doesn't think they add much to strengthening the main webs which are the block weakness. Haven't asked him about hardblock on a well seasoned block.
Well this has gone on long enough, I'll get pictures of a good cross section of my parts tomorrow just because.
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