Carburators

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Comment by Spike on March 4, 2009 at 10:18am

Steelcity6, The odds are in your favor that a phenolic 1" spacer will help. I ran a 2" aluminum spacer & the car was quicker than without it. As to spray, well, it depends, Are the pistons forged ? If not I wouldn't go over 100 HP
(N. O.). You don't know what the inside looks like, am I right? If so, I would start in small steps, checking for detonation or any odd sounds.

Comment by steelcity6 on March 4, 2009 at 12:22am

One of the reasons I chose this engine was the claims that it reved high. Keep in mind until last year I spent the last decade rebuildin mazda poered cars I enjoy high winding cars. Spike if I added a phelonic spacer say 1 inch would that help ? would I be able to spray on it with out Boom?

Comment by James on March 3, 2009 at 1:13am

I have a 355 small chevy with a cast crank, gmx rods, hyperutectic pistons, and is well balanced. It holds up to 7000 rpm's very well.I have .002 thousandths on rods and .0025 on the mains with clevite H bearings. 457 hp @ 6800. Fun little toy in an s10.

Comment by Spike on March 2, 2009 at 10:25am

Ah, But that was a Ford truck engine. It wasn't designed to rev. the cam & induction, not counting the head flow, the bearing clearances, etc.Weren't designed with 'Hot Rodding' in mind. The engines I'm talking about are balanced, with forged cranks, rods & pistons, Good flowing heads, cams & large carburetors. Besides these aren't 'old' engines. They are freshly built with good parts. As an aside, the Nitro burning engines in the Nostalgia Dragsters, are (sometimes) built on an original 1957 Chrysler Block. Most of them are using Aluminum 'repro' Blocks that have been redesigned to handle the stress. Back to the SBC, the 327 has a stroke of 3.25", much shorter than a 350, 383, 400, up to 434", which has a 4" stroke. The 283 has a stroke of 3". Using a forged crank etc. keeps the 'tinys' alive at 8000 rpm. As I stated previously, I still have (in one piece) a short block 355 on a stand, that regularly revved to 7000 rpm (I set that as an arbitrary limit) while running a stock CAST crank & stock rods. It ran multiple times over the years of 1997 to 2004. Speeds of up to 154.25 MPH were attained (I have the timing slips) to prove it. ETs of, well the best was 8.87*. It ran faster & quicker, each time out. I will grant none of these were stock. A stock 283 would run to 6000
rpm (with a Rochester 4-jet) or dual quads, or FI. The 'OLD' days of mid to late 60s, there was a class called "JR Fuel" it was a CI limit of 310", no trans, just a clutch,as light as you wanted, Fuel Injected, on NITRO and they ran upwards of 198 MPH, 3" stroke, stock Crank & Rods. Of course they were forged cranks & Rods. But it still remains the little SBC just naturally revved.
I won't say "unlike the Fords" which had to be coerced to do it.
BTW, YES it is "HARSH". But they will still live there.

Comment by Aarons83z28 on March 2, 2009 at 3:04am

8k? What year was this 327 out of? 8k on ANY motor, much less an old motor, is incredibly harsh =\
I blew a head gasket on my 69 Ford f-250 just by taking it up to 5.3k, 8k woulda blown a piston straight through my hood!

Comment by James on March 1, 2009 at 3:02am

Nothin like the sound of a screaming small block chevy!!

Comment by Spike on February 27, 2009 at 9:33am

Steelcity6, OK, here's a memory from the dark ages. Yes they (283s=327s) would rev to 8k and beyond. But usually not for too long. It will depend on the 'steel' crank, forged rods & pistons. With good parts, it'll live. I ran a stock 350 crank & rods up to 7k regularly. I refused to go higher. It is sitting on an engine stand waiting for a new home.

Comment by steelcity6 on February 27, 2009 at 12:38am

thanks for the help guys looks like Ill be lookin for a smaller carb...Alot of the problem is I dont know alot about this engine the old owner said it will rev to 8k with no problem but that seems really high even for a 327. Obviously the tunnle ram was put on the car cause it did rev high but im not sure 8k.

Comment by James on February 26, 2009 at 11:49pm

In regaurds to steelcity6 taking off the dual quads and going with a single carb setup and good intake was the best idea on a street motor. To determind proper carb size for any engine, you need to know the cubic inch and rpm you plan on running. A basic formula for this would be CID X MAX RPM /3456. Their are a few different formulas for this but this one will atleast get you in the ball park. Take the number you end up with and round up to the nearest carb cfm size.

327 x 6500 / 3456 = 615.01
A good 650 cfm carb would be sufficient.

Comment by Spike on February 26, 2009 at 1:56pm

steelcity6, I ran a 350 -Team G 850 Holley, Brodix Track1 heads, #86 primary+ #94 secondary, Reed solid cam .575" lift, PG, 1150 lbs weight. 4:30 gears 30x10.5x15" Goodyears, Ran 154.+ , and ET of 8.87 1/4 mile. I tried a 750 cfm it was slower, went back to the 850. Two 450s pass quite a larger volume of air I assume you didn't run straight linkage. If you want to add more fuel just get bigger jets. For a street 327 I would run a 650-750 cfm carb. But that is just my opinion.

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