MRL Performance
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Here is our latest endevor, a BBM 400. Its a bit of a "Sleeper" as it is a stock looking 400 2bbl. The HP manifolds make it look a little better. Here is the run down, well as much as Im willing to tell yall anyhow.
400 BBM
4.375" bore 3.38" stroke
Stock 383 516 2bbl heads and intake
Heads were Not ported, only a blend for the new seats that we installed
Super light weight valvetrain, Beehive style springs, light weight valves
10 to 1 compression
2.08/1.60 valves
Holley 4412 500 2bbl carb
Super light weight internals, 2066g bob weight
Lunati Voodoo 60303 cam
MP iron adjustable rockers
Top end oiling mod
A few tricks here and there
Ran the water pump with the crank, not electric drive, and a real life 175* water temp. Timing was set to 34* total, A/F was 12.4-13.0.
Factory 400 4bbl rating is 190hp/305tq, and thats with a 4bbl
We ended up with 357HP @ 5200 rpm and 455TQ @ 3000rpm
It ran strong, pulled hard and sounded great. It had 16-17inches of vacuum at 800rpm, no vacuum advance. With a 4bbl intake and headers, this engine would make another 100hp easy.
Any way you look at it, its making a lot more power than a stock 400, with smaller heads, smaller intake, smaller carb. The advantages are, more compression and a mild performance cam, lighter pistons and valvetrain and few *Special* mods.
400 BBM
4.375" bore 3.38" stroke
Stock 383 516 2bbl heads and intake
Heads were Not ported, only a blend for the new seats that we installed
Super light weight valvetrain, Beehive style springs, light weight valves
10 to 1 compression
2.08/1.60 valves
Holley 4412 500 2bbl carb
Super light weight internals, 2066g bob weight
Lunati Voodoo 60303 cam
MP iron adjustable rockers
Top end oiling mod
A few tricks here and there
Ran the water pump with the crank, not electric drive, and a real life 175* water temp. Timing was set to 34* total, A/F was 12.4-13.0.
Factory 400 4bbl rating is 190hp/305tq, and thats with a 4bbl
We ended up with 357HP @ 5200 rpm and 455TQ @ 3000rpm
It ran strong, pulled hard and sounded great. It had 16-17inches of vacuum at 800rpm, no vacuum advance. With a 4bbl intake and headers, this engine would make another 100hp easy.
Any way you look at it, its making a lot more power than a stock 400, with smaller heads, smaller intake, smaller carb. The advantages are, more compression and a mild performance cam, lighter pistons and valvetrain and few *Special* mods.