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Old 12-18-2003, 01:33 AM
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327 build-up suggestions

I have a 327 small block,large journal, 2-bolt main engine and I want to build it to produce 375-400 horsepower. I took it apart already and it's bored .40 and has flattop pistons. looks to me like whomever had it before me had just done the inside work. It has original crank thats good yet. I want to put a bigger cam, roller rockers,heads, intake,pete jackson timing gears,and a high volume oil pump into it. Already have a edelbrock 4160 carb. I have about $2000.00 dollars to spend for now. Can anyone give me a good power combination for the stuff I listed and maybe some advice on what else I can do
to produce more power for my price range. Thanks it will be greatly appreciated.

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Old 12-18-2003, 05:22 AM
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Re: 327 build-up suggestions

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Originally posted by stewwwy1
I have a 327 small block,large journal, 2-bolt main engine and I want to build it to produce 375-400 horsepower. I have about $2000.00 dollars to spend for now. Can anyone give me a good power combination for the stuff I listed and maybe some advice on what else I can do
to produce more power for my price range. Thanks it will be greatly appreciated.
Good luck on getting 400 hp for 2 grand. A good set of heads will take most of that.

What is the hp of your motor now? If it one of the higher hp ones (350hp), then maybe you have a chance.

Either way, you have a good start....spend your $2000 on quality rebuild parts and see what you get.
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Old 12-18-2003, 06:27 AM
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first of all..do you have the double hump heads?..check the casting number on them online to see, aslo use a micrometer to see if you have to 2.02/1.60 valves in them..if you do then just have them hot-tanked and maybe polished a good machine shop can do this for a couple hundred bucks
next find a good intake(i recommend a dual plane) that will help feed the engine
choose the cam that is right for what you are wanting the motor to do if you need to call the company tech support and they will be happy to answer any of your questions
i would install a set of domes(pistons) in it (i run .010) in my 377 c.i. this way you will have good compression on pump gas
headers..cant go wrong with headers a good brand that will help the moter expell that exhaust
the most important thing is to get in contact with the companies tech support lines they are full of helpful info and can get what is right for you...hope this helps
and poncho....i have a 377c.i. chevy in my montecarlo and i have just shy of 450 hp and all this was done with $2176.63 i saved the receipts ..lol
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Old 12-18-2003, 08:19 AM
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The most Chevy got out of a 327 was the 365hp, which had 11:1 or better compression and a mechanical, high-duration cam. But, those were "gross" ratings, not the "net" ratings of today.
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Old 12-18-2003, 08:39 AM
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I had great success with an 11:1 327. It had a the 375 HP solid cam, 1.94 double hump heads (ported) and the Z-28/LT-1 intake manifold. If you use aftermarket 2.02's, this combination will easily net you 380 HP. I would use a high pressure pump (M55A Melling) instead of the high-volume to gain a few (10-12) horses at 5500, and a good chain drive will be more efficient than the gear drive. I drove that 327 for 20 years on pump gas and had no problems. The timing was 20` initial with 32 total, all in by 2500 rpms.
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Old 12-18-2003, 02:30 PM
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In 1964-65 the 327 was built with 375 hp which is the largest GM 327 built
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Old 12-18-2003, 03:12 PM
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Those ratings were gross ratings.
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Old 12-18-2003, 03:30 PM
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I'm sure the 400 mark is possible how ever it will have to be reached at quite high rpms which won't make it the greatest street engine. Your best bet is probably to buy the best set of heads you can get such as afr these heads with the right combination with the parts should enable you to reach 400hp but it won't come cheap.
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Old 12-19-2003, 07:32 AM
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Allow me to quote from this article about a 327:

"This little motor fooled us all by cranking out an honest 408 hp at 5,700 rpm with peak torque at 400 lb-ft at 4,800 rpm."

It is from this article:

http://www.chevyhiperformance.com/te...578/index.html

Dont know about the costs as it included a roller cam set up, but 400 can apparently be done....

I'm looking into doing something similar to this, but maybe without the roller cam...
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Old 12-19-2003, 02:06 PM
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I know there is a difference between gross and net but it sounds like you know my statemnet was correct. So I do not under stand why you stated 365hp was it

Also like to state that 400hp out of a 327 is not as hard as one may think. It will pek higher than a 350 but just as capable of the 400 mark.
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Old 12-19-2003, 04:16 PM
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you should concentrate more on torque than horsepower because torque is what gets you movin. build it for tons of low end power with peak hp at 5500 or so.dont get to crazy with the cam and work mostly on the heads.maybe check out some dart heads or edelbrock rpm heads. $2000 should be plenty if you can get by without much machine work. shop around for swap meet parts or racers who are changing parts. get a desktop dyno and find out what parts can perform best for your set up. good luck and burn rubber.
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Old 12-19-2003, 08:52 PM
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327's are junk!
Send it to me and I'll get rid of it 4 ya.
Seriously though. I love the 327's. They rev up quick, still have decent cubic inces and can definatly fool ya.
I think in the old days 375 horses was a lot, but with new cam profiles and better pistons and intakes, carbs, ect.... 400 is way feesible. HG
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Old 12-20-2003, 02:42 AM
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Back in high school I built a 327 out of a 4 bolt 350 block and rods,I had 11:1, scorpion torquer, 750 dbl pumper, camel humps, 300-525 solid cam ,4.11 gears and a 3200stalled 350 in a 69 nova. It pulled 12s. It had to be close to that mark, gross or net. If you have the time to shop around for deals I think its way doable.
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Old 12-20-2003, 10:37 AM
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There's a guy on ebay who can get you dart heads 165cc runner for a little over 500 bucks. THe 180 and higher iron ealges can be gotten for about 700 or so, which is a great deal. I would suggest 180cc runner 64cc chamber with 2.02 valves. Get a weiand stealth intake for it and a lumpy cam, something in the neighborhood of 280 adv dur. Roller would be nice to have too, but if you can't get one go the next step lumpier with a flat and push your engine higher (although probably not higher than low 6000's because you'll start needing high RPM valve train equipment.) Get a nice set of roller rockers, you can find them for about 170. Call the cam company and make sure the springs on your heads are jiving with the cam, and that should get you your 400 or better horse. THose darts knock the crap out of stock heads, and thats what they used on the test previously posted.

Good luck,

K
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