Alright, I am stuck with my L03 POS and it's getting annoying....or slow. I am going to upgrade to a L98 very soon but I have a few questions. First off I plan on rebuilding the L98 to my own specs. I am going to put on vortec heads with high lift springs, a LT4 hot cam, vortec base with large mouth runners, 52mm TB, and all the computer stuff. What I want to know is about the internals. Would it be more cost effective to just bore out the block and make a 355, get new pistons and rods and use the old crank? Or would it be better to spend a little extra and get a balanced 383 stroker kit? I've seen some amazing things done with a 355, talking about people running away from Z06's, w/o nos. I want to make around 400 ft/lb and possibly 350-400hp. I want something streetable but really fun to drive and that won't get beat up by four bangers. Anyone with a 383 or 355 let me know your setup and what you think about it, power output, et's, anything. I am just trying to gain some insight on what I should build. Thanks a lot all
Lc

 

Sounds like the exact thing I'm going through right now. lol I have found that Scoggins Dickey has a Vortec TPI crate engine on their site. I think if I put a 400 crank in that, it would haul ***. Anyway, I'm anxious to see some more posts.

 

LOL, what a small world. That is the exact reason I posted this, is because of that very engine and the possibility of it being even more of a monster if extra cubes were added.
Lc

 

lol, well if we could only get someone to answer we'd be all set.

 

well i read a article in chevy high performance mag they built a 355c.i. with 9:8:1 compression,trick flow G1 heads,1 5/8" headers 3" exhaust,218/228 cam,holly stealth ram 24 LB injectors and stock gears 3:23 and stock computer they ran 12.0 in the 1/4 thats the setup im doing this winter tell me what you think maybe an idea for you guys o yeah and it put 330hp/400lBs torque to the rear wheels.

 

Did that article say how much low end torque the engine lost with steath ram as opposed to TPI? Or was it just an engine build article with really no comparison? That is a pretty stout combo to run 12s. Thanks for the reply!
Lc

 

well yes it comes with a complete dyno sheet comparison but it was compared to a tpi with ported and siamised base and aftermarket runners .just put it this way the HSR had plenty of low end torque 396.4 lbs of torque @ 2850 RPMs thats enough for me.

 

ME WANT THAT ENGINE(SDPC2000/360HP VORTEC T.P.I) TOO, LOL.

 

don't worry about the low end loss w/ using the Stealth Ram over the TPI. W/ a stock TPI the low end is too low in the powerband to really help w/ any type of drag situation. modified it moves up in the powerband and is more useable.

you main question was the 355 vs the 383. well as it is always said, "There is no substitute for more cubes."

that being said the 383 will give you more torque under the curve, but in having more cubes will require more air in/out.

i personally am building a 355 myself, but simply b/c this is the first motor im am personally assembling myself, and do not want to mess w/ the additional machine work in checking clearances for the stroker motor.

i would have rather built a 383 but stumbed upon a great deal for both a crank and rods so i jumped on it and haven't looked back since.

Do a search on the "355 vs 383" topic. it has been discussed hundreds of times and there is a great amout of stuff out there on it. that is probably why not many people have replied is b/c it has been discussed so many times.

 

Check My sig and search for 1bad91z or mike crews on this board. There both running vortec headed tpi motors and there both putting down over 300 rear wheel horse and over 400 rear wheel torque. They also run low 12's. I would suggest some stout heads, i(vortecs, darts iron eagles, World Sportsmans, afr's) with around 170-195 cc intake runners, a descent cam, like the comp cams xe262, or xe268 but get it with a 112 lsa. Specs should be somewhere like 218/224 with somewhere around 500 lift and 112+lsa. With a good set of heads and a good cam like I suggested, Now match it with a good induction. Something that flows in the area to 1500-6000, unless you plan on revving to the sky. More duration means more rpms up top but less low end. Thats why I would reccomend the 383, Even if you use a higher duration cam, You will still have massive amounts of low end because of the longer stroke. If fuel injection is what your after then use a fully ported ltr setup, or a super-ram, miniram something. And If your not then just go with a standard holley 750DP with a dual plane high rise. That will also get you into the 12's.

If you have the cash then go with some afr 190's. They are BAD-AS* heads!!! check this package out that chevy high performance got from their products

383ci
afr 190's
9.5-1 compression
AFR Flopower RPM manifold #5029
Holley 750-#4779
Comp Cams HDRoller Cam 12-433-8-(big cam)
MsD Distributor@36 degree timing
93 octane=

a whopping 503 horsepower and 517 ft lbs!!!!!Now thats power!!!!

There are many ways to make a 350 or a 383 fly, You just have to know what you want, and where you want it (RPMS). After that it just takes research, and research to get to where you wanna be.

Just my 2cents


IROCZMAN380

 

irocman,

At what RPM was the hp and tq of that 383 produced?

Thanks

 

503hp@ 5800 RPMS
517 ft lbs @ 4600

There ya go---


IROCZMAN380

 

wow imagine this using the setup they used in the mag except 383 bottom end instaed that would probably produce like 370rwhp and 500lbs rwtq i think i want that lol.

 

Wow, that is a whole lot of power. I want to be able to rev my engine up to about 6 grand easily and never over 7000. I've done a lot of research on stroker kits and other combos for both 355 and 383, but I am looking for hard core evidence of what everyone else has experienced as opposed to numbers on a graph or advertisement. I want to be able to run with all the LT1 and LS1 and stomp mustangs, but have a streetable, fun car as well. So about 400-450 hp and tq would be nice.

IROCZMAN, what was the price of building that 383?? Sounds like a pretty fun combo!
thanks for the replys!


-Lewis (305RSlc)-

 

Well If your going to go 383, Id suggest looking for a shortblock with forged pistons. I know www.wheelermotorsports.com sales some good stuff and www.sdpc2000.com also has some short blocks but they get a bit pricy. Heres a break down for the above setup that made 503 horsepower:

383 short block----1200
AFR 190's----------1200 (i think)
Manifold------------150
Carb-----------------250
Cam-----------------200



Thats around 2800 for that alone. You still have to get Roller rockers, Pan, water pump, pulleys, Starter, flywheel, timing chain, balancer, and you know all the other goodies.

So Id say Your looking at around 4000 dollars for that combo depending on how much stuff you already have, and what brands you go with. If you go FI it will cost even more, But its really not to bad of a deal, because chevy sales crate 502's that are berly pumping out 500 horse and there selling for 8000. So its really not that bad. And keep in mind that 503 hories was made with OUT OF THE BOX AFRS. That should tell you the quality of these heads is excellent. I wish I had a pair. Ill prolly use em on my next motor. But if you have the cash afr's are well worth the dough!!!

Just my 02cents


IROCZMAN380