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Old 08-29-2011, 12:26 AM
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SBC 377 Build

I'm Planning on Build a SBC 377 I Have A 3951509 Block 2 Bolt Main, And A 3932442 (67 Camaro) Crank And I'm Looking to turn 5.5k to 7.5K without issues and I'm my understanding from my last build stock cranks are only good to turn 5.5K I'm wanting to get a scat crank to handle the rpms I'd like to get this engine to 450hp na.

my last build 350 i accidentally turned 7200 once but since then i put a msd box with a 6k chip its a flat top / stock vortec head motor

am i right for not wanting to use a stock crank?

and whats better 5.7 rods or 6" rods?

and could i bolt vortec style heads on the 400?

i know that it has an extra water jacket, just wondering if the heads could be machined to the 400, and if not what heads would be a Good candidate for my money,

i'm planning on building it according to a cam my buddy runs i think he said it was like 710 lift yea i know its alot but i'm going to build the motor around that cam

any help would be great guys

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Old 08-29-2011, 01:54 AM
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Quote:
Originally Posted by BuckinJeep
I'm Planning on Build a SBC 377 I Have A 3951509 Block 2 Bolt Main, And A 3932442 (67 Camaro) Crank And I'm Looking to turn 5.5k to 7.5K without issues and I'm my understanding from my last build stock cranks are only good to turn 5.5K I'm wanting to get a scat crank to handle the rpms I'd like to get this engine to 450hp na.

my last build 350 i accidentally turned 7200 once but since then i put a msd box with a 6k chip its a flat top / stock vortec head motor

am i right for not wanting to use a stock crank?

and whats better 5.7 rods or 6" rods?

and could i bolt vortec style heads on the 400?

i know that it has an extra water jacket, just wondering if the heads could be machined to the 400, and if not what heads would be a Good candidate for my money,

i'm planning on building it according to a cam my buddy runs i think he said it was like 710 lift yea i know its alot but i'm going to build the motor around that cam

any help would be great guys
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Forged or at least a Scat9000 Cast Steel crank with Scat's Cap Screw I-Beam Rods would be a good idea.
5.7" Rods usually gives you more Piston choices & keeps the Oil Ring out of the Piston Pin area.
The Steam holes can be drilled in the Vortec Heads. Vortecs don't flow well over .500" to .550" tho'.
GM 'Bowtie' Vortec Heads would be a better choice, they come with several larger size Intake runners & have extra material for porting. Or other brands Heads.
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Old 08-29-2011, 07:50 AM
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I turn my stock 350 crank to 7000 all the time. A short burst to 7000 rpm is much different than holding long periods at 7000 rpm.

why build a 377 when you could build a 406?

5.7 or 6 inch rods makes not difference in power. Use the 5.7 for a cheaper and less problematic build.

any sbc head will bolt onto a 400 block. However, it will need steam holes drilled in the heads of you plan to drive it on the street.

0.710" lift is a waste of time and money if the heads don't flow more at 0.700" than 0.500". Stock Vortec heads stop flowing after 0.500" lift. Furthermore, a 0.700" lift cam will not last very long and neither will the valve train. You will be changing out the entire valve train every 5000 miles. If you are planning to drive it on the street then use a lot less lift.

what gear and trans are you planning to use?
planning to drive it on the street?
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Old 08-29-2011, 08:15 AM
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X2 just how will this be driven ?



Cole
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Old 08-29-2011, 04:59 PM
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Yea, i figured i would not use my vortecs They are only good to 470 lift i've been looking at brodix heads, for the big cam, it's going in a mud truck, in front of a 4spd, no street, it would turn 5.5K to 7.5K 6 to 10 secs at a time, 5.7 rod would have less dewl right? just want to build it right and no worry about turn rpms, What i want is a Scat crank, 5.7 rods, flat tops, and brodix heads with roller lifters and rockers.
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Old 08-29-2011, 07:34 PM
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Even so in the past we ran the 372 combo with great results on the drag strip in the early 90`s I really got to like the combo. However, if I had a 400 I`d build a 400. You can take a 372 and a 383, build them with equal pieces in identical cars, same tranny, same gears and they`ll run side by side.
However, give the 400 the equal build and it`ll blow both them both away. We built both the 383 and 372 combo`s for mud and drag racing, but we learned a lesson later on which was once you go 400 you don`t go back.
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