363 Build

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Author Topic: 363 Build  (Read 9251 times)

Offline Coupe66

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363 Build
« on: October 24, 2022, 07:39:50 pm »
Hi all,
I am looking to build a 363 Windsor for my 66 Mustang and would like some ideas on a combo that could see me possibly get into the 10 second 1/4 mile times naturally aspirated.
My current 347 build with 185 AFR heads, rpm air gap, 750dp carb, Howard’s  hydraulic roller cam, has run a best of 11.4 aspirated and 10.7 with 100 shot of nitrous.
This has been and still is a fantastic motor to date, but I would like to see if 10s are possible with an aspirated motor. I would like to stay with Hydraulic roller if possible, but not a game breaker either.
Any ideas or experience of similar combos would be great.
Note- car has 3500rpm converter in the c4 auto and 3.9 diff ratio in the 9”
Cheers,
Wes..

Offline Dwayne

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Re: 363 Build
« Reply #1 on: October 24, 2022, 09:14:30 pm »

Offline GLENN 70

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Re: 363 Build
« Reply #2 on: October 24, 2022, 10:38:57 pm »
Interesting . What are your 60 ft times? , 1/8 mile mph ? , and mph finish ? . Do you run a spacer plate under the carb ?  . The 363 will need a bigger carb maybe and a  Vic Jr intake too . After market block also . You need another 40-50 more HP in your 347 to get into the 10s unless your 60 ft is crap . ps I have been to the track a few times in the last few mths but it keeps getting rained out ,now toooo hot .  What colour is your mustang ?  You need a 1.5 in the 60 ft , around 100 mph in the 1/8 and around 124 mph over the line to run a 10 .9
« Last Edit: October 24, 2022, 11:05:48 pm by GLENN 70 »

Offline Coupe66

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Re: 363 Build
« Reply #3 on: October 25, 2022, 07:09:22 am »
Hi Glenn,
My Mustang is red.  The run that went 11.42 the 60 ft time was 1,688 , 1/8th mile was 7.284 and mph was 116, but I think I backed off just before the finish line. The rpm air gap has 1/2” open spacer plus the 1/2 inch nitrous plate, so basically 1”.
The car has run 10.73 at 127mph with the 100hp nitrous shot, with a 1.65 60ft time as I didn’t hit the nitrous off the line.
My thoughts are the 363 with all the good gear similar to my current engine may not have enough to get me into the 10s?
Am thinking AFR 205 heads (58cc)and victor jr intake. Should be close to 11.5 to 1 compression
I would like to use similar to my current hydraulic roller cam. It is a Howard’s cam part number 220275.
Do you think I will gain an extra 40-50 hp?
Thanks.
Ps I am heading to Willowbank again first weekend of November for the road trip drag challenge.   

Offline GLENN 70

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Re: 363 Build
« Reply #4 on: October 25, 2022, 10:03:56 am »
The 363 combo will run a high 10 . Your 60 ft time is too high ,you need a low 1.5 . Your converter is too small at 3;500 and needs to be 4;500 to 5,000 rpm .  That will be a problem if using gas . Before going 363 I would fit a bigger converter and the Victor jr intake which you are going to use on the 363 anyway ,so not a waste of money . Going down from a 1.6 to a 1.5 is 2 tenths off the et ,so 11.2 just by getting off the line better .  I’m no expert but been racing all my life and had a 66 with a mild 347 for years . 11.9 at 115 mph with crapy tyres , was a total  sleeper , ran stock 5.5 x14 inch original steel wheels and mustang caps ,std mustang air cleaner too .  wheels Now a 70 mach 1 that should run around 11.4 at 117 mph . Your going to be up in the rpm range with 3.9 gears also once your mph comes up .
« Last Edit: October 25, 2022, 11:01:24 am by GLENN 70 »

Offline Coupe66

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Re: 363 Build
« Reply #5 on: October 25, 2022, 07:08:28 pm »
Thanks for the info Glenn.  Yep, I always thought the converter is too small.
I am being offered a 363 early next year from a mate at too good a price to turn down, so I will still look at building the new motor.
Just trying to get ideas of a combo that might run in the high tens without being too radical.
The rpm’s when it went 127mph was a bit over 7000, that’s with 26” tyre.  The 3.9 ratio feels about right.
Your old 66 was impressive for what it was running.
What are you running in the Mach 1?

Offline GLENN 70

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Re: 363 Build
« Reply #6 on: October 25, 2022, 07:27:53 pm »
My 70 is a cruise car , power steering and air con etc etc . I did run it earlier this year but it had a miss , bad coil after me changing everything else 1st . Still ran 11.71 @115.9 mph . Every run was low  1.6 .  . M/t et streets 255/60 x15 . 408 stroker , 4,000 stall and 3.7 gears .  Just a flat tappet hyd cam ,not a roller . A guy that goes to the track in a grey 66 I want to run . 347 stroker too .

Offline Coupe66

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Re: 363 Build
« Reply #7 on: October 25, 2022, 07:42:22 pm »
That’s a cool cruise car with still plenty of grunt.

The 363 I am thinking 205 AFR heads, aim for 11.5 compression, victor jr manifold, it already has a brand new 750 APD carb, decent size hydraulic roller, 1 3/4” extractors and larger converter , maybe 4500 rpm.

Any ideas on what horsepower I could be expecting from this. ?

Offline GLENN 70

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Re: 363 Build
« Reply #8 on: October 25, 2022, 08:07:42 pm »
HP I have no idea . That’s a good combo  :thumb:.  4,500 converter is ok just . 4,500 is quite big on the street but no big on the track . Buy the best converter you can get , don’t ask me which brand as it’s a touchy question .  Do you have a good suspension set up ? , chassis connectors etc etc ? . . On mine I just run no front sway bar , chassis connectors and cal tracks and et streets.  I can not spin the wheels at willowbank . Sure can on the street  :grin:

Offline Coupe66

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Re: 363 Build
« Reply #9 on: October 25, 2022, 08:38:29 pm »
I don’t have chassis connectors , just soft front springs with 90/10 shocks.   Traction bars not caltracs in the rear.
I’m same as you, traction is fine at Willowbank with et streets, but street tyres on the street is definitely fun/scary to say the least  :smile01:
Even if the new combo is only a slight improvement on what I have it will still be cool.
It’s hard to compare anything to that giggly gas. :lol:
I would just like to get close my goal with a nice aspirated motor.

Offline GLENN 70

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Re: 363 Build
« Reply #10 on: October 25, 2022, 08:58:00 pm »
Have fun and if I see you at willowbank sometime I will say hi . I have a mate will a red 35 GTR that’s keen to give it a run ,should run a high 10 no problems . We went up 3 times and each time it got rained out .  Will be next winter now ,tooooo hot how . 

Offline Coupe66

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Re: 363 Build
« Reply #11 on: October 25, 2022, 09:09:02 pm »
No worries, thanks Glenn.
Cheers also for the info.  :thumb:

Offline Blue Oval

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Re: 363 Build
« Reply #12 on: November 14, 2022, 03:34:50 pm »
G'day Wes,
I have a similar combo and a 10 sec 1/4 is a possibility with a 347 in my opinion.
 You definitely need more converter. 5-6000 rpm.
Also caltracs or Gazzard leafs etc for the rear end if you haven't got similar ?
Each tenth of a second you drop on your 60 foot time is equal to two tenths at the end.
Glenn has given good advice. 100mph in the 1/8th and a low 1.5 sec 60 ft or 1.4sec will get you there.
Few mods and you could do it. Great challenge and cheaper than building a 363.

For reference I ran 11.21 sec at 123 mph with a 60 foot of 1.57 and 1/8th mile 98mph.
4500 rpm converter. 4.11:1 gears, AFR 185, 11.2:1 compression, Victor Junior manifold. Comp Cams 304 hyd roller cam. 800 DP Prosystems carb. 1 5/8" extractors, 2 1/2" exhaust connected at the time.
Had a 10 sec 1/4 in it. Needed more converter.

 1966 GT Coupe. AFR 185 heads, Hyd Roller cam.  1/4 mile 11.21 sec @123mph

Offline barnett468

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Re: 363 Build
« Reply #13 on: November 27, 2022, 11:04:38 am »
If you don't need to stick with 363 just stroke it to something larger.

You might consider using MOREL limited travel lifters for your app if you stick with hydraulics.

Offline Coupe66

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Re: 363 Build
« Reply #14 on: June 01, 2023, 06:32:32 pm »
Ok guys,
I am close to receiving the 363 short block I am buying off a mate of mine.
I am sticking with the RPM air gap with 1” spacer, but will be doing some porting work on the manifold as well.
Have ordered the Howard’s HR cam # 220275
241, 247@50 and 581 , 603 lift with 110 lobe sep.
I am now thinking I will go the AFR 195 heads with 58cc chamber- should give 11.5:1 comp.
Currently have 1 5/8” extractors , but may end up going custom 1 3/4” as my mustang is RHD - already have twin 3” exhaust.
C4 with 3500 converter  , 9” with 3.9 gears.
The goal is to run a high 10sec 1/4 in my 66 coupe.
Any input would be appreciated.
Cheers
Wes.