So which heads will get my 358 in the high 10's

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1980RS
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Re: So which heads will get my 358 in the high 10's

Post by 1980RS »

Just got the car running in the last few minutes. The car is way more responsive with the Vic. Jr. on it and starts better over the Air Gap. So my guess is if all works out the car should be better off the trailer. I sure like that FST carburetor, whack the throttle, instant response :D .
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Re: So which heads will get my 358 in the high 10's

Post by HQM383 »

1980RS wrote: Thu Jul 21, 2022 2:40 pm ..... I sure like that FST carburetor, whack the throttle, instant response :D .
You’ll have to pin gauge that FST one day to unlock its secrets of success. :D
I’m a Street/Strip guy..... like to think outside the quadrilateral parallelogram.
1980RS
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Re: So which heads will get my 358 in the high 10's

Post by 1980RS »

HQM383 wrote: Thu Jul 21, 2022 3:42 pm
1980RS wrote: Thu Jul 21, 2022 2:40 pm ..... I sure like that FST carburetor, whack the throttle, instant response :D .
You’ll have to pin gauge that FST one day to unlock its secrets of success. :D
Ya that kind of sucks of them. The card I have lists the bleed numbers but there are none on the bleeds, that one is kind of stupid for sure.
1980RS
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Re: So which heads will get my 358 in the high 10's

Post by 1980RS »

Here it is ready to run
20220721_191644.jpg
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rewguy
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Re: So which heads will get my 358 in the high 10's

Post by rewguy »

6.50camaro wrote: Fri Jul 08, 2022 12:44 pm
econo racer wrote: Fri Jul 08, 2022 8:14 am I would put the 8 inch converter in it 1st. :D
I can attest to that fact, when I went from a 3500 stall 10" converter to a 8" 5300 stall my street/strip 383 was .3 quicker in the 1/8th mile and dropping the full exhaust for 12" collector extensions dropped it another .15 to .2 . went from a mid to high 7.40's car to a high 6.90's car. Dan
What size exhaust did you take off? What mufflers as well?
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Re: So which heads will get my 358 in the high 10's

Post by 6.50camaro »

rewguy wrote: Sun Jul 31, 2022 8:12 am
6.50camaro wrote: Fri Jul 08, 2022 12:44 pm
econo racer wrote: Fri Jul 08, 2022 8:14 am I would put the 8 inch converter in it 1st. :D
I can attest to that fact, when I went from a 3500 stall 10" converter to a 8" 5300 stall my street/strip 383 was .3 quicker in the 1/8th mile and dropping the full exhaust for 12" collector extensions dropped it another .15 to .2 . went from a mid to high 7.40's car to a high 6.90's car. Dan
What size exhaust did you take off? What mufflers as well?
I took off a pypes stainless system 3 "x 2-1/2"reducer at collector 2-1/2" the rest of the way. x pipe, pypes M80 mufflers w/turndowns in front the rear end .
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Re: So which heads will get my 358 in the high 10's

Post by 1980RS »

Looks like rain and 70 degree dew point is going not make this happen come this weekned, rats.
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Re: So which heads will get my 358 in the high 10's

Post by steve cowan »

1980RS wrote: Thu Aug 04, 2022 8:50 pm Looks like rain and 70 degree dew point is going not make this happen come this weekned, rats.
Bummer,
Cylinder head time :D
steve c
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1980RS
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Re: So which heads will get my 358 in the high 10's

Post by 1980RS »

steve cowan wrote: Fri Aug 05, 2022 2:32 am
1980RS wrote: Thu Aug 04, 2022 8:50 pm Looks like rain and 70 degree dew point is going not make this happen come this weekned, rats.
Bummer,
Cylinder head time :D
Yup, rain is headed that way twards the track right now, but since we really need the rain where I live I am not complaining about that.
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Re: So which heads will get my 358 in the high 10's

Post by 1980RS »

They are racing today but it looks like the slip and slide nationals out there :lol: Next Friday's weather looks to be fantastic so I will be going then. I will post times and some pictures on Sat. for sure after the test day. This also gives me some time to test the 2 1050 Dominators, Ya I know their to big :lol:
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Re: So which heads will get my 358 in the high 10's

Post by vortecpro »

A better title would be:


"what driveline behind my 350 will get me in the 10s"


Still waiting for you to get on me with that peanut port :D
Racing a NA NHRA stocker should be mandatory before any posting.
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Re: So which heads will get my 358 in the high 10's

Post by skinny z »

vortecpro wrote: Sun Aug 07, 2022 1:54 pm A better title would be
"what driveline behind my 350 will get me in the 10s"
This has a lot of significance with respect to where I'm going next.
I had posted earlier (a few years back) about my perceived HP claim based on weight, MPH and ET.
I happily assumed I was reasonably well north of the 400 CHP line. That would have been a 3700 lb race weight car that ran a corrected 109 MPH.
It was explained to me by a Stock class racer (Racing a NA NHRA stocker should be mandatory before any posting :wink: ), that the power required to do that was considerably less than 400. Probably closer to 360.
Then it occured to me that my 400+ HP claim wasn't too far off the mark but that was peak HP. It's average HP as seen at the tires that counts. With my poorly set up chassis and drivetrain, I was rarely at that peak as I was always accelerating to get there. My average was way down. Down to 360 apparently.
If, with a properly dialed in convertor and sufficient traction, that 109 result could undoubtedly be faster. The ET would follow.

This time around, I may just lean on the strip side of performance and factor out the cross country driving.

Before:
15/06/05
2210’, 59F/15C, 29.91” Hg/101.29 kPa, 51% rh
DA: 2855
12.92 @ 104.87, 8.21 @ 83.77, 1.85 60’
12.479 @ 108.653 MPH corrected
12.93 @ 105.46, 8.23 @ 83.15, 1.85 60’
12.489 @ 109.264 MPH

As you can see, I'll say the HP was there, but the rest of the car was lacking.

The OP's mileage may vary.
Kevin
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Re: So which heads will get my 358 in the high 10's

Post by 1980RS »

vortecpro wrote: Sun Aug 07, 2022 1:54 pm A better title would be:


"what driveline behind my 350 will get me in the 10s"


Still waiting for you to get on me with that peanut port :D
My new one Next month will be "what will my peanut port engine run with ported L29- heads" :lol:
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Re: So which heads will get my 358 in the high 10's

Post by 1980RS »

Rats, rain ruined today also. :evil:
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Re: So which heads will get my 358 in the high 10's

Post by steve cowan »

1980RS wrote: Fri Aug 12, 2022 3:08 pm Rats, rain ruined today also. :evil:
Yep,
Same here on other side of the world.
Was a nostalgia event today so there would of been some track prep.
Spent all last weekend setting a baseline caltrac,shock setting, checking wheel alignment etc.
Oh well wait another 2 weeks I guess :?
steve c
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