Fuel Pump and Spark Plug Recommendation - Chevelle Tech
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post #1 of 14 (permalink) Old Oct 1st, 19, 9:47 PM Thread Starter
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Chris
 
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Fuel Pump and Spark Plug Recommendation

I finally got the motor and trans in the car so now it's time to start bolting on some parts. It's a 468 BB, hyd roller, steel 702 heads, 850 Holley that should be in the mid 500 HP range. This will be a street car.

#1, I am looking for a mechanical fuel pump that will work with both the supply and return fuel lines. I want a pump as stock looking as possible. I believe a 100 gph pump would work.

#2, I need a recommendation on what spark plugs I should use and what the gap should be. I will be using an HEI distributor.

Thx in advance for any suggestions.

Chris

Chris

1970 SS396 Chevelle
468 ci, TH 400, 3:73 posi
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post #2 of 14 (permalink) Old Oct 2nd, 19, 8:29 PM
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Re: Fuel Pump and Spark Plug Recommendation

NO ignition system should have any larger than .045 MAXIMUM spark plug gap, including EVERY HEI ever produced.

What compression ratio will the engine be, please?
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post #3 of 14 (permalink) Old Oct 2nd, 19, 10:21 PM Thread Starter
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Chris
 
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Re: Fuel Pump and Spark Plug Recommendation

10.5:1.

Thx Dave.

Chris

1970 SS396 Chevelle
468 ci, TH 400, 3:73 posi
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post #4 of 14 (permalink) Old Oct 3rd, 19, 9:02 AM
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Re: Fuel Pump and Spark Plug Recommendation

Quote:
Originally Posted by SS468 View Post

#1, I am looking for a mechanical fuel pump that will work with both the supply and return fuel lines. I want a pump as stock looking as possible. I believe a 100 gph pump would work.

Look at the Carter musclecar pumps, they look stock but flow a little bit more than a stock pump.
FWIW, I have run high 11's in the 1/4 mile with nothing more than stock replacement 40727 fuel pump.
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post #5 of 14 (permalink) Old Oct 3rd, 19, 9:07 AM
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Re: Fuel Pump and Spark Plug Recommendation

Quote:
Originally Posted by SS468 View Post
I finally got the motor and trans in the car so now it's time to start bolting on some parts. It's a 468 BB, hyd roller, steel 702 heads, 850 Holley that should be in the mid 500 HP range. This will be a street car.

#1, I am looking for a mechanical fuel pump that will work with both the supply and return fuel lines. I want a pump as stock looking as possible. I believe a 100 gph pump would work.

#2, I need a recommendation on what spark plugs I should use and what the gap should be. I will be using an HEI distributor.

Thx in advance for any suggestions.

Chris
Here is a stock looking pump that flows 110 gph for about $26.00

https://www.jegs.com/i/JEGS/555/15961/10002/-1

I would go with E3 Diamond Fire Plugs.

https://www.jegs.com/p/E3-Spark-Plug...57739/10002/-1
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post #6 of 14 (permalink) Old Oct 6th, 19, 11:41 PM Thread Starter
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Chris
 
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Re: Fuel Pump and Spark Plug Recommendation

Thx guys for the suggestions.

Chris

Chris

1970 SS396 Chevelle
468 ci, TH 400, 3:73 posi
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post #7 of 14 (permalink) Old Oct 7th, 19, 8:30 AM
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Gene
 
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Re: Help with new crate engine overheating

For 500 hp you need at least the Carter 110 gph.

NGK plugs is all I use anymore. Not Chinese ACs or Autolites. Unsure of the 702 heads seats for a part #.

I gap plugs at 043 for MSD use .

Gene
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post #8 of 14 (permalink) Old Oct 12th, 19, 11:28 AM Thread Starter
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Chris
 
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Does a 110 gph mechanical pump require a regulator? Thx

Chris

1970 SS396 Chevelle
468 ci, TH 400, 3:73 posi
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post #9 of 14 (permalink) Old Oct 12th, 19, 12:49 PM
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Re: Fuel Pump and Spark Plug Recommendation

My 496 is running an LS6 replacement AC pump. It has a return line and supplies plenty of fuel. Looks stock because it is stock. I recommend NGK GR5 plugs gapped no more than .045.

70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #10 of 14 (permalink) Old Nov 11th, 19, 10:30 PM Thread Starter
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Chris
 
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Re: Fuel Pump and Spark Plug Recommendation

Tom, I see in your signature that your 496 is putting out 628 HP. How does an LS6 pump supply enough gas for that beast if the 454 was rated for almost 200 less horsepower? I'm not questioning your setup just trying to educate myself.

Thanks, Chris.

Chris

1970 SS396 Chevelle
468 ci, TH 400, 3:73 posi
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post #11 of 14 (permalink) Old Nov 11th, 19, 10:52 PM
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Re: Fuel Pump and Spark Plug Recommendation

Quote:
Originally Posted by SS468 View Post
Tom, I see in your signature that your 496 is putting out 628 HP. How does an LS6 pump supply enough gas for that beast if the 454 was rated for almost 200 less horsepower? I'm not questioning your setup just trying to educate myself.

Thanks, Chris.
Well, folks will tell you the LS6 was underrated by a whole lot for starters. Beyond that.. I don't know. All I can tell you is that this Carter pump (in my post earlier I said it was an AC) supplies 7 pounds from a stand-still to 6,000 RPM in high gear. All the lines, sending unit and switching valve are stock. 3/8" feed, 1/4" return. I was going through a lot of more expensive pumps and I think the stock pushrod might be a factor so I got a lightweight one and installed it with this cheap factory replacement pump and my fuel delivery problems vanished.

I just had the receipt in my hand and I recall the pump cost about $33 in 2015-ish. I'll post the part number when I get home. I have been planning a switch to EFI so the cheap pump was supposed to be just to get me by.... Turns out it's the best one I've had in the truck and I'm still having fun goofing with carbs.
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70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #12 of 14 (permalink) Old Nov 11th, 19, 11:58 PM
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Re: Fuel Pump and Spark Plug Recommendation

Here is the pump I'm using-

https://www.jegs.com/i/Carter/180/M6102/10002/-1

And, of course, it's $3 cheaper now than when I bought mine...

70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
Tommy the Cat is offline  
post #13 of 14 (permalink) Old Nov 12th, 19, 10:17 PM Thread Starter
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Chris
 
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Re: Fuel Pump and Spark Plug Recommendation

Thx Tom for the explanation. I will be buying this pump. My cam calls for a bronze tip fuel pump pushrod so I plan to buy that as well.

Chris

1970 SS396 Chevelle
468 ci, TH 400, 3:73 posi
SS468 is offline  
post #14 of 14 (permalink) Old Nov 13th, 19, 5:14 PM
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Re: Fuel Pump and Spark Plug Recommendation

NGK and Auto-Lite are great spark plugs.



E3, I have had nothing but bad news with them, they shroud the spark way too much, and fully empty wallets for a mediocre, to just plain useless part.

Spark plug heat ranges ARE NOT set by ignition systems, they are set by engine parameters, mostly compression ratios.

Plug gaps are set by the emissions level of the engine, and/or the processor type. An HEI, NO MATTER THE COIL, .045 MAXIMUM. MSD, .045 maximum. Engines with serious compression ratois would need less spark plug gap to overcome the compression resistance (a function of the compression ratio) in the chambers.
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