I like the way they point out the mistakes and general B.S. they ran into during the construction process,
and the mistakes the previous builder and machine shops made.
personally ID have started over with a new DART SBC BLOCK rather than going through the crap they did to save the old block
it would have avoided a great deal of the stress and block related trauma.
keep in mind they had a 4" stroke crank in a SBC and a 4.125" bore and .
the need for heavy counter weights and 5.7"_- 6" connecting rods but limited deck height (9"- to about 9.02")
this may help you learn how at least this engine builder thinks
to calculate piston pin height or compression height,
First, divide the stroke by two and add that to the rod length: example if its a 383 build the stroke is,
3.75 / 2 = 1.875, and 1.875 + 6.00 = 7.875. Next, subtract that answer from the SBC deck height: 9.00- 7.875 = 1.125. So the answer is that the piston compression height should be 1.125 inches
SBC has a nominal 9" deck
so with a 6" connecting rod it would be a 1" pin height (likely too high in the ring grooves)
so with a 5.7" connecting rod it would be a 1.3" pin height (likely requiring to much counter weight removal)
so with a 5.875" connecting rod it would be a 1.125" pin height (optionally the route they took)
so with a 5.85" connecting rod it would be a 1.150" pin height ( probably the route they took)
one more reason why you do the math and measure the parts and ask questions before ordering most parts
Boostline Connecting Rod, Chevy Small Block, 5.850 in. Length, ARP2000 Set of 1. | SC5850-927S
Boostline Connecting Rod, Chevy Small Block, 5.850 in. Length, ARP2000 Set of 1.
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remember the formula for displacement
bore times bore times stroke times the number of cylinders times .7854
thus 4.125 x 4.125 x 4 x 8 times .7854- =427.6 cid
keep good durability and great lubrication, as a high priority
if your building a 427 SBC it should be built on a DART block and a FORGED 4340 steel rotating assembly and FORGED PISTONS
and if super or turbo charged you'll want static compression down around 8.5:1 to allow decent boost with minimal detonation, and probably ID use E85 and an intercooler and oil cooler Id try to keep the quench in the .040-.042 range, ID use solid copper head gaskets and dished forged pistons and keep the fuel/air ratio in the mildly rich range to keep the the potential for detonation minimal even with E85.they used BRODIX dragon slayer heads (a good choice)
Brodix 1320000: Dragon Slayer DS 225 Series Cylinder Heads 225cc Intake Ports - JEGS
Get the Best Performance with Brodix Dragon Slayer DS 225 Series Cylinder Heads 225cc Intake Ports 1320000 parts at JEGS. Shop Now at the Guaranteed Lowest Price!
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in the video they used doubled head gaskets to HALF ASS THE LOWER COMPRESSION from over 10:1 to lower just over 9:1
yes that saves money but its not the correct route'
I like the use of a single plane intake and sniper EFI and ignition they used
and the sniper optional efi programable software and recomended gauges looks to be almost mandatory
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