A forum member had me build a mild 406 for his 71 Chevelle, I thought I would post some pictures. I had a very nice thick 817 production block, bore and stroke 4.155 X 3.750, with a 7/16 6 inch rod and a Mahle piston, we ended up with 10.3 compression. The cam is hyd roller, 234/238 @ .050 .560/.530 lift on a 110. We used a AFR 195 head with modifications and a performer RPM air gap intake with a 1 inch open spacer. Carb is a AED 750 CFM. We plan on testing different distributers, locked and with a timing curve. Gas will be 91 octane from 7-11. Should be a interesting build. I should mention the valve job from AFR was a disaster.
400 Small Block Build And Dyno Test
VORTECPRO
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I got a block just sitting in my garage a 817 picked it up last yr for a friend and he ended up buying a crate 406 based off a 350 block bored and with a 3.875 crank, similar to the one David Vizzerd talks about in his book. So now I have a stock bore 400 block and no real use for it. thought about putting it back on craigslist but with all that is going on right now it is fine sitting in my heated garage.
I thought about building it with a scat 3.875 crank and scat I beam procomp rods and forged pistons, but not in my budget and no car to put it in.
I thought about building it with a scat 3.875 crank and scat I beam procomp rods and forged pistons, but not in my budget and no car to put it in.
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