Hot Rod Forum : Hotrodders Bulletin Board

Hot Rod Forum : Hotrodders Bulletin Board (http://www.hotrodders.com/forum/)
-   Engine (http://www.hotrodders.com/forum/engine/)
-   -   383 questions!!! (http://www.hotrodders.com/forum/383-questions-121903.html)

400smb_s10 08-10-2007 03:01 PM

383 questions!!!
 
I have a 1995 350 that siezed on me.. and I also have an 1973 400 crank.

What I would like to know is..

Could I use the siezed 350 block unsieze it and have the machine work done to it and then use the 400 crank?

I would also like to know what would be a good combo to get me around 350 hp and 400ft lbs at around 9.5:1-10:1 compression, and If all possible have a revlimit of 7000 RPMs

Thanks a bundel in advance! :thumbup:

Ed

53_belair 08-10-2007 03:23 PM

Im pretty sure this is how the first 350 stroker kits came about? I am pretty sure you can have the mains turned down the .200. It is going to be real easy to get to your power goals, why the rev limit at 7?

383silverado 08-10-2007 03:26 PM

yes you could use the 400 crank but i think you have the mains ground down to 350 mains.

http://www.ryanscarpage.50megs.com/combos1.html

also here is alittle info on 383's

http://www.chevymania.com/tech/383.htm

400smb_s10 08-10-2007 03:58 PM

I just thought that the revlimit @ 7000 RPMs was lots of revin unless it will take more?

Thanks

Ed

53_belair 08-10-2007 04:10 PM

With your power expectations, there is no need to be up there. You will have to put some money in your valve train if you want to be up there all the time. At 350hp, you will have a cam, intake and heads that are gonna run out of steam around 6k if not before so I see no reason. Each to thier own though, I love the sound of a small block up there so dont get me wrong :thumbup:

Blazin72 08-10-2007 04:22 PM

I believe the '95 350s had one piece rear main seals. The older 400s are two piece rear main seals. You'd need an adapter for it to work. And yes, there are adapters to install two piece cranks in one piece blocks. I think Moroso makes it.

Here's the adapter: http://store.summitracing.com/partde...5&autoview=sku

383silverado 08-10-2007 04:40 PM

Quote:

Originally Posted by 53_belair
I love the sound of a small block up there so dont get me wrong :thumbup:


this guy is working on my 383

check out this 8400 rpm video of This 356 ci 673 hp 9:1 compression, Koerner racing Built

http://www.koernerracing.com/swtour.htm

53_belair 08-10-2007 04:41 PM

Quote:

Originally Posted by Blazin72
I believe the '95 350s had one piece rear main seals. The older 400s are two piece rear main seals. You'd need an adapter for it to work. And yes, there are adapters to install two piece cranks in one piece blocks. I think Moroso makes it.

Forgot to mention that, all 87' up blocks i believe are 1 piece rear.

454C10 08-10-2007 04:43 PM

350hp and 400 ftlbs can be made with a mild 350. Use 10:1 cr, edelbrock performer heads (170cc intake, 64cc chambers), and a cam with 210 to 215 degrees of duration.

I have seen a 350 built with 190 cc AFR heads that made 345 hp and 400 ftlbs with 10:1 and a very mild compcam 252H (206/206 duration).

If you use a 400 crank you will also need to use a 400 flywheel, 400 balancer, and chamfered bearings.

You may also run into flywheel size issues. A 400 flywheel is 168 tooth and you might be using a 153. However, I have seen some bolt on counter weight that convert a neutral flywheel into a counter weighed flywheel (400 flywheel). also the 400 balancer maybe bigger than your current balancer which could throw off the belt alignment. Might be better just to get the 400 crank internally balanced so you can use the same flywheel, balancer, and starter.

Gm makes 383 crate engine with a roller cam that makes about 350hp and over 400ftlbs. roller cams make more power.

383silverado 08-10-2007 04:54 PM

or you can get a new 3.75 stroke scat 9000 1 piece rear main seal crank for 200 bucks.

454C10 08-10-2007 05:14 PM

FYI

gm 383 crate engine with 196/207 degree roller cam and vortec heads, gm intake and 625 demon carb makes
338hp and 444 ftlb of torque

Add 1.6 ratio rockers and power goes up to
355hp and 453 ftlbs

Add a rpm intake
370hp and 467 ftlbs

add a 750 carb
379hp and 474 ftlbs with a tiny, smooth idling cam.

Hippie 08-11-2007 08:39 AM

Quote:

Originally Posted by 383silverado
or you can get a new 3.75 stroke scat 9000 1 piece rear main seal crank for 200 bucks.


That's the only way to fly as fas as I'm concerned. I was going to the adapter route, I already had a 2 Pc. rear main 383 crank and had a 1 pc. block but by the time you get your 400 crank turned down and buy the adapter you'll have WELL over the cost of new Scat crank in it. The adapters are in the neighborhood of $140 IIRC and then you still have the leaky 2 Pc. rear seal to deal with. You'll be money ahead to sell the 400 crank and buy a new 1 Pc. crank. I traded off my 2 Pc. crank and bought the Scat crank for mine and it is REALLY nice.


Quote:

Originally Posted by 454C10
gm 383 crate engine with 196/207 degree roller cam and vortec heads, gm intake and 625 demon carb makes
338hp and 444 ftlb of torque ........... with a tiny, smooth idling cam.

That is the '395 Marine cam which is also used in the 350 Ramjet. Don't let the specs fool you it is a great little cam. I have been playing with it on DD2000 and with a set of AFR195 heads on the HT383 engine 454C10 listed above it showed 440 LbFt PLUS from 2,000 through 4,500 RPM and 404 HP at 5,500 RPM. This is an engine that would idle at 600 RPM like a sewing machine, pull hard to 5500 and and run on cat pee. I have been able to duplicate GM's dyno results for the HT383 on DD2000 within 5% so I'm pretty confident about the numbers I just posted. Swap in the ZZ4 cam and TQ drops to 403 at 2,000 but is 459 @ 4500 and HP is 448 at 5,500 and it still has a fairly smooth idle.

Mine goes to the machine shop in about 5 weeks. I'm using a Scat crank, 5.7 rods, 18cc D-cup pistons, Vortec heads and the ZZ4 cam. I was going to use the '395 cam and already have it but I decided I could give up the low end in exchange for a little more between 4,000 and 5,500. DD shows that combo making 383 HP @ 5,000 and 431 Lb Ft @ 4,000 with 398 LbFt at 2,000.

I'm still kicking around spending the bucks for the AFR's and sticking with the milder cam though. I'd pick up power all the way through the power band and I think I could be happy with those kind of numbers. :D

454C10 08-13-2007 08:26 AM

All the hp/tq numbers I gave above were from a Hot Rod Magazine article published in March 2002 (pp 25-32). I left out the final dyno using a XE282HR compcam were it made 455hp at 5600 rpm and 493hp at 4200 rpm still using vortec head sand 9.6:1 cr. But the cam would require more stall and gears.


All times are GMT -6. The time now is 05:13 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.