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408sbc race gas combo

 
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vonzo
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Joined: 22 Sep 2006
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PostPosted: Sat Sep 23, 2006 9:50 pm    Post subject: 408sbc race gas combo Reply with quote

I'm buiding a 408 sbc high RPM motor Dart 230heads Lunati solid roller 265 int 267 exh at .050 108 lobe sep 645 int 645 exh with 1.5 rocker recomend 1.6 on int Dart int for 4150 carb 950 cfm Im having a hard time estimating HP and if thats enough cam for those heads they flow 254 at .500 272 at .600 275 at.700 It is a 12.5:1 motor internally balanced forged crank an 5.56 H beam rods may have to bump compression also to 13:1 anyone with a good program to estimate this is a very similar combo to a 410 sprinter just having troble with the details it hase to run gas not alcohol
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nwcc
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PostPosted: Sat Sep 23, 2006 10:30 pm    Post subject: Reply with quote

I have access to some very detailed software. Is it a dry sump motor? Are you going to be using a windage tray and crank scraper?
I also need header info..like primary length/ diameter and collector length/ diameter.
Electric waterpump?
The software even asks what type of cam drive (belt, chain, or gear)
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vonzo
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PostPosted: Sat Sep 23, 2006 11:14 pm    Post subject: 408sbc race gas combo Reply with quote

windage tray and crank scraper gear drive timing setup headers are 1 and7/8 steped to 2inch 28 inch primary 4 inch collector and yes it will have an electric water pump sorry so slow to respond Im not to savy on the computer
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GrandSportC3
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1968 Chevrolet Corvette

PostPosted: Sat Sep 23, 2006 11:17 pm    Post subject: Reply with quote

That's a very similar setup like mine.. You sould be around 650 HP (flywheel)
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vonzo
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PostPosted: Sat Sep 23, 2006 11:22 pm    Post subject: 408sbc race gas combo Reply with quote

forgot to mention heads a iron not aluminum class rules
thanks for reply I bet that is a fun ride with 650 hp

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GrandSportC3
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1968 Chevrolet Corvette

PostPosted: Sun Sep 24, 2006 3:12 pm    Post subject: Re: 408sbc race gas combo Reply with quote

vonzo wrote:
forgot to mention heads a iron not aluminum class rules
thanks for reply I bet that is a fun ride with 650 hp

The iron heads won't affect performance.. just weight..
The Iron Eagle 230cc and Pro 1 230 cc are identical casts just different material!

here's a video of one of my runs (on a hot summer day 2900 DA)

http://www.corvetteforum.net/c3/grandsportc3/desoto1076.wmv
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vonzo
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PostPosted: Sun Sep 24, 2006 5:04 pm    Post subject: 408sbc race gas combo Reply with quote

SSHHWWEEEETT. I had a 68vette convertible for a short time restored a 56 chevy 2 door post for it. It had been burnt was in terible shape. The bone head I got it from was in a divorce at the time unknown to me she held the title I held the car had it for 7 years unable to do anything to it she finnally got the car. bad record keeping on my part and dumb trade. That video makes me a little jealous but Im impressed with your abilities and machine what are your shift points how many revs do you turn it? what stall I looked up specs but cant remember
Vonzo

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GrandSportC3
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1968 Chevrolet Corvette

PostPosted: Sun Sep 24, 2006 5:21 pm    Post subject: Re: 408sbc race gas combo Reply with quote

vonzo wrote:
SSHHWWEEEETT. I had a 68vette convertible for a short time restored a 56 chevy 2 door post for it. It had been burnt was in terible shape. The bone head I got it from was in a divorce at the time unknown to me she held the title I held the car had it for 7 years unable to do anything to it she finnally got the car. bad record keeping on my part and dumb trade. That video makes me a little jealous but Im impressed with your abilities and machine what are your shift points how many revs do you turn it? what stall I looked up specs but cant remember
Vonzo

I shift at about 6800 RPM and that's about where the peak HP comes in.. I'd usually shift 300 RPM past peak HP but I really want the engine to last for a while. I use a 7000 RPM chip in the MSD 6AL, so if I'm a little late shifting, I hit the rev limiter. I'm going through the traps close to 6800 RPM. (at 125 mph)
I might trap at about 7000 RPM in winter.. Maybe I'll have to put the 7200 RPM chip in there for winter..
The car would be about .2 - .3 faster with more stall speed (according to the builder which recommends 5500 RPM stall). Listen to the video and you can hear how the car has a hard time reving up after every shift but once the RPM's are past 6000 RPM, the revs shoot up like crazy..
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vonzo
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PostPosted: Sun Sep 24, 2006 5:44 pm    Post subject: 408sbc race gas combo Reply with quote

It sounded pretty responsive. mine will have to run a few more RRRS than that I worry about longevity too your setup is Ideal in my opinion. my 408 goes in belive it or not a puller truck most guys run big blocks but I have had much success running a 70 LT1 against these guys I run a little more gear,( final drive ratio any where for 28:1 to 20:1) and a lot more RPM. Truck pulling is as much a ground speed game as brute torque game. It takes alot more money to build a 9000 RPM big block than a 9000RPM small block. Plus a truck puller gets many many less hours use per year than a 1/4 miler no practice session.
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GrandSportC3
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1968 Chevrolet Corvette

PostPosted: Sun Sep 24, 2006 6:15 pm    Post subject: Re: 408sbc race gas combo Reply with quote

vonzo wrote:
It sounded pretty responsive. mine will have to run a few more RRRS than that I worry about longevity too your setup is Ideal in my opinion. my 408 goes in belive it or not a puller truck most guys run big blocks but I have had much success running a 70 LT1 against these guys I run a little more gear,( final drive ratio any where for 28:1 to 20:1) and a lot more RPM. Truck pulling is as much a ground speed game as brute torque game. It takes alot more money to build a 9000 RPM big block than a 9000RPM small block. Plus a truck puller gets many many less hours use per year than a 1/4 miler no practice session.


Listen closely at the engine after shifts.. Right after every shift, there's a slight hesitation. That hesitation would be gone with a higher stall speed.
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clay
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1972 Chevrolet Nova

PostPosted: Mon Sep 25, 2006 4:47 am    Post subject: Reply with quote

Man, I love truck pulls - kind of like a drag race slowed down so you can really enjoy it Very Happy . Clay
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junkyarddog
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1982 Oldsmobile Cutlass

PostPosted: Mon Sep 25, 2006 9:10 am    Post subject: setup Reply with quote

My setup and GranSprtC3 have similar setup except I run 5500 stall powerglide. This past saturday we raced at in finals of pro (yay I made it to finals!) I ran 10.393 @ 127.84mph. This was at 2620' air BUT 20-25mph cross/head wind. I shift at 7000rpm and trap at 6800-6900. Without the wind I would say it would have run hi 10's low 20's @ 130-131. That wind was screwy. My dad second time trial in our 225" RED almost lost it at top nd b/c of wind. It was running hi 8.40's at 157 (also 406sbc).
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vonzo
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Joined: 22 Sep 2006
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PostPosted: Mon Sep 25, 2006 5:37 pm    Post subject: 408sbc race gas combo Reply with quote

Youve got that right clay I used to Drag race my little 70 LT1 in my 55 Chevy and loved it but somehow that motor found it way between the wheel wells of my 68 GMC 4X4 ever whant to make a dog out of a pretty stout little motor just put it in a 4700lbs pickup but first time I hooked on a sled I was hooked more fun than racing
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