Thread: I want to get 425HP out of a 327...

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I run a 327 with 10:1 pistons, Comp 280/480 cam, vortec heads, beehive springs, Edlebrock intake, 750, headers and is still shy of 400 hp. Very streetable but a 383 in an El Camino just walked away from me at a light. I am building a 496 BBC and there will be no more loosing! I say build the 383, no replacement for displacement!!!

Anyone who says it's easy to build a streetable 327 with 425 hp in a Corvette hasn't built too many motors. Not only is it not feasible, it's just silly. A good high-rise, dual-plane intake such as a Edelbrock RPM or Weiand Stealth alone is worth 40 hp and you can't get one to fit under the stock 'vette hood. So, if you have to use a low-rise intake, you'll have to go bigger on the inches. I'd be on the lookout for a stock bore 400 block.

Disassemble the 327, oil everything and wrap it in plastic, then squirrel all of it away for a later sale to someone who wants the gennie mill with the car.

Do you remember when stock a 327 came with 375 HP. Surely we can get 50 more HP. If I were going to build a motor just to win a race, It wouldn't be a 383. He wanted to build a 327. 7000 rpm hole shots were fun when I was younger.

Originally Posted by Mikej

Do you remember when stock a 327 came with 375 HP. Surely we can get 50 more HP. If I were going to build a motor just to win a race, It wouldn't be a 383. He wanted to build a 327. 7000 rpm hole shots were fun when I was younger.

Are you old enough to remember 100 octane gas at the local corner service station to feed those 11.0:1 motors??
Are you old enough to know that the hp figure was GROSS, with ZERO accessories??

Fred, if you are stuck on the 327, just hook up a 125 shot of juice to it. Done.

We do lots of builds with the later roller blocks and also many using the Dart SHP block and a 3.875 stroke/4.125 bore 6 inch rod for 414 cid---with some Dart or AFR heads makes lots of streetable power

The way they measured horsepower back in 1965 when they rated that 327 fuelie engine at 375 hp is different than the way horsepower is measured now. By today's standards of measurement, that 375 hp 327 would probably be closer to 350 hp.

Originally Posted by techinspector1

Are you old enough to remember 100 octane gas at the local corner service station to feed those 11.0:1 motors??
Are you old enough to know that the hp figure was GROSS, with ZERO accessories??

Fred, if you are stuck on the 327, just hook up a 125 shot of juice to it. Done.

I do remember 103 octane at the local gas station. You could run a couple of different mock ups on your desk dyno and see what you come up with. And I did have a 327 as a kid with 11:1 - 2x4's- 292-302 dur. solid cam .512 lift and manual trans. Lots of fun. 4 miles to a gallon. lots of broken parts.

Originally Posted by jerry clayton

We do lots of builds with the later roller blocks and also many using the Dart SHP block and a 3.875 stroke/4.125 bore 6 inch rod for 414 cid---with some Dart or AFR heads makes lots of streetable power

550hp, 520ft/lbs with 10.0:1 SCR, 248/254 roller hyd cam, AFR 210 heads.

Check this site for 327 build:http://www.chevyhiperformance.com/te...mer/index.html Getting close.

Thanks Richard

For the money you will spend to build and maintain that 327 ,including all the broken parts from 7k hole shots and the like you could build a 454 smallblock with the 327 valve cover stickers and have a winner !

You will be then known as the guy who has the kick butt 327 under the hood!

If you do build the 327 have fun and keep us posted with how that goes...I am sure everyone here will be more than glad to help with thier exsperiance and help you put together a screamer.......they are just letting you know things wear and break often at those numbers you are looking at and its not cheap to do either.

Basically to sum it up ...thats not the most economicall way to get that hp, nor is it the most reliable.

Have fun in whatever you decide to do !

wow you guys are at it again,

take that 327 punch it .060 run 11:5-1 with a nice solid cam i know its old fashioned but it quite frankly works, use the offroad z cam .493 .512 and a good set of heads, you get get a cheap set of bare procomps have them all set up and fixed. or if youve got a set of camel humps laying around use them.

horsepower and torque are just a number if it does what you want it to do and run the number who cares what it has.

the combo i sent you would probably have 4-425 horse if it was built right and balanced n blueprinted.

if i can run 13:1 go down to joes corner store fill it up with 92 and some octane booster from a bottle and drive around with iron heads you shouldnt have a problem.

you can still buy the 100 or 103 what ever it is up the road from me at a chevron station. It is in the $8.00 a gallon range.

My two cents is you can get as much hp out of it as the amount of money you want to spend.Oh,by the way..............Anyone want to venture a guess at what rpm range that peak hp is going to happen??.Yeah,your going to buzz that 327 up.

Tell you what.One of my pet peeves is questions of hp on street driven vehicles.

Seriously,what segment of that rating do you really get to use on a daily basis?

If I am going to spend my hard earned dollars,I want to be able to feel the effects of that investment every time I drive it.

So it is deductive logic on all the posts before this one.The wise money is in fact spent on stroker 350 or World sbc.Why??.Well from my way of thinking,they create torque which is tons more valuable than hp on street vehicles.

Got to figure if you build a small c.i.sbc for hp,each time you drive it on the street,you get about a 1/3 return on that investment on the basis of what you really feel from the mod.To me,that is a waste of money when you have so many other choices.

Just my two cents worth mind ya.

Originally Posted by 1gary

torque which is tons more valuable than hp on street vehicles.

Got to figure if you build a small c.i.sbc for hp,each time you drive it on the street,you get about a 1/3 return on that investment on the basis of what you really feel from the mod.To me,that is a waste of money when you have so many other choices.

Just my two cents worth mind ya.

and thats your opinion and your entitles to it,

but whatever