Here is my 400 build going in 78 GMC SWB 4x4. 3.42 gears guessing weight is 5k.
Gas mileage is not important. Not going to drive it that much, weekly crusie in.
I am not building this myself, I have a local builder doing that.
511 400 block recent bored to 406. All normal machine work
Scat 9000 Series Cast Steel crank 3.750 x 5.7
Keith Black Hypereutectic Pistons
034 bowtie heads. 64 cc. 202 intake 160 exhaust 184cc intake runners
rockers and springs came with the heads.
Steam holes need to be drilled yet.
Comp Cam Thumpr Pro-Plasma Nitrided lift .489I/.476E.
Intake duration 235 Exhaust duaration 249
ARP block studs and ARP bolts.
My builder thinks that I should go to a 680 or 750 cfm carb. Based on a calulater
he used he thought it need around 650 to 700 cfm. What do you guys think?
Any other suggestions?
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2017 Silverado LTZ 6.2
1984 Scottsdale K10 - 468 700r 4x4 lwb
1978 GMC Sierra Grande K15 350 Soond to be 406 th350 4x4 swb
1968 GMC 20 305 V6 good ole wood hauler.
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