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Old 03-24-2004, 07:32 PM
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Need Advice on Engine Build Up

Hi, I am 16 and have a '78 Malibu that has a 305 in it, but not for long. Just recently I purchased a 350 4 Bolt Main out of a early 70 pickup. My dad and I were planning on putting 375 fueled heads, 268 Crane Cam (and all matching valvetrian parts), Hooker headers, a 600 Edelbrock Carb, Performer Intake, Scat Crank, Boring it .030 over, High Performance Rebuild Kit, and Etc. Plus we got to get a 350 Turbo tranny and between a 3.23 & 3.73 gear. So is there any other parts I might need to get or any advice? Also about how much HORSEPOWER will it and have, and what should it run in and 1/8th? I was hoping to get 425-450 HP so I'll be fastest at school.

Sorry I meant a 266 Crane Cam

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Old 03-24-2004, 07:48 PM
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"High performance rebuild kit" what type of pistons? flat top, domed, etc.. forged, hypereutectic etc..compression on the pistons?

I just built my first motor BY MYSELF. its 78' 350 4bolt 9.35:1 speed pro hyper flat tops, vortec heads, comp magnum roller tips 1.52, comp XE 262, performer rpm airgap, Holley 650 double pumper, cast crank, reconditioned rods.

It makes around 350hp
I highly doubt you would make 400+hp. If its street you are looking for more tq really.

If this is daily driver you don't want over 10:1 compression really since you will be getting into pump gas friendly issues.

-Eric
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Old 03-24-2004, 08:19 PM
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I`m in the same boat...I`m rebuilding as we speak. When starting from scratch make sure all machining is done. Along with boring or honing your block.....MAKE SURE you balance it, keep your compression ratio around 10 to 1, you must have a tight quench . I skipped some of those important things my last time and my high dollar bolt ons were nothing....just a slow car.I am not kigging you, parts alone dod not make the car go.....the machining is a must also. Pay attention to the machining part of the rebuild , and I`m sure all of the ole timers on here will agree. I wish I had this advice before. Now I`m back at the machinist spending twice as much.

Good luck!
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Old 03-24-2004, 08:23 PM
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First off, be forwarned of many "high performance rebuild kits" the pistons that come in these kits have .020 off the tops, which kills quench and compression, My suggestion would be to get the teflon coated skirt speed pro pistons off ebay, the buy it now price is around $135, this is for a 4 valve relief flat top with coated skirt. Ebay is ate up with pistons, only most of the plain jane flat tops have the .020 off the tops, avoid these. set your Quench distance of around .045 to .040, keep the compression around 9.5:1. I`d run a comp cams H268, it`ll give a lopey idle and won`t kill low end torque. I would get the basic rering kit from Northern Auto parts that includes bearings, rings and gaskets.
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Old 03-24-2004, 08:26 PM
Erk Erk is offline
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I did not balance my 350-375 hp motor because my rotating assembly is very close to stock weight.

-Eric
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Old 03-25-2004, 03:51 AM
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First off, close to stock weight? That doesn't make any sense. Each piece of a rotating assembly is balanced individually, and stock Assemblies are not balanced. Second, horsepower and torque are mathematically derived from one another, you cant just build a motor with "a lot of torque."

To make the 400 horse you need a bunch more cam, aftermarket heads and some more compression. Its cool you and your dad have a project to work on together. Put some more cam in it so you can hear it when it idles, it will put a smile on your faces!

K
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Old 03-25-2004, 07:51 AM
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I will be using Hypereutectic F/T pistons, and will have the block machined as well as cleaned. The guy who will be working on it said with 375 Fueled Heads it should push between 400-450
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Old 03-25-2004, 08:14 AM
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Quote:
The guy who will be working on it said with 375 Fueled Heads it should push between 400-450
Color me stupid. What are 375 fueled heads? Where can I get some and how much?
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Old 03-25-2004, 03:01 PM
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I will be using Hypereutectic F/T pistons
Still be aware, these also come with .020 off the tops, Know what your buying before you pull your money out.
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Old 03-25-2004, 03:49 PM
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isnt that because most of the time tdc is .025 down from the deck?
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Old 03-25-2004, 03:58 PM
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I'll watch out for those pistons, but I think I can't put a 268 cam in it, b/c I really don't use a stall converter.

I think 375 fueled heads came off old Vettes with a 327. I was told you can buy them at Chevrolet dealerships.
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Old 03-25-2004, 04:18 PM
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Yeah but on cam and carb, intake etc.. That can affect your tq.
The "close to stock weight" i really don't know much about..
My friend told me that who owns a machine shop and is running a 10.20 in with his sbc so i think i'll listen to what he is saying.

-Eric
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Old 03-25-2004, 05:51 PM
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How can it not be pushing 400+ HP. If you have 375 Fueled heads
that will put me right at 375 then plus the extras it should be pushing around 425-450 HP.
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Old 03-25-2004, 07:07 PM
Erk Erk is offline
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It doesn't work like that.
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Old 03-25-2004, 09:16 PM
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stock heads will not get you over 400 hp in almost any case. The only way you'd make 400 with those heads is like with a 292 adv cam, roller rockers and a single plane intake. NOt gonna happen, you need aftermarket heads or settle for 350 hp.

K
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