qwarnon

Alright so I'm shooting for between 375 and 400 flywheel hp on a budget 355 build. The motor is basically built, i'm just wondering if you guys think i will make around 375-400 or not.

Its about 10.3 to 1 compression 355 with

3.5 stroke crank, lighter rods, arp bolts, Hyper pistons with valve relief
.030 overbore
summit 1105 cam with 1.6 roller rockers around .495 and .505 lift with rockers
461 heads with minor gasket match porting and 2.02 1.60 valves
no power steering
moroso underdrive pulley on crank.
Air gap dual plane intake
edelbrock 750cfm carb
shorty 1.5" primary headers
HEI distributor

Anything you think i should change? should i go with bigger primaries? should i hit it with a 50 shot of nitrous (i want this to last so no big shots)

Remember its a budget build.

2nd3rd4thgen

i think you should be pretty close to what you want with out the spray,and if it doesnt make it just throw a 100 shot on it and call it a day.

qwarnon

thanks and also best budget n20 kit? plate style, for this motor. used or new either way.

big hammer

edelbrock makes nice n2o kits and are usually cheaper than nos stuff

you should be close to your goal. the 461 heads are decent for back in the day stuff but the newer designs are far superior

qwarnon

yeah thats what ive heard on the 461's, i just got em for a good price, only $150 bucks fully assembled except rockers, with screw in studs, push rod guides, etc.

i think my next upgrade will be a nice set of aluminum heads so i can handle the compression better

2nd3rd4thgen

(Edelbrock 479.99 for the Performer Nitrous Kit) (NX Hitman System 432.99 ) (NOS 431.99 for the Super Powershot kit ) or you could get the (nos sniper kit for 387.99 ) but the super powershot kit is a little bit better as far as the hardware it comes with compared to the sniper kit. these are all good entry level kits. This is off of jegs web site.

big hammer

i've had a sniper kit. it's cheap but it's cheap. works well though.

moge11

use 1-5/8 headers...

moge11

use the Comp Xtreme Energy XE274 230/236 duration and .490 lift. .523 w/ 1.6 rockers. will probably make 20 more horsepower than what you have picked...

brucer

convert it to roller cam around .520/540 lift.. and msd ignition and your there.

1994t/a

I agree with this 100%....im running a XE274 in the 355 i built for my nova.all i can say is WOW! ive never had a cam that makes power like it all across the rpm range.it comes up on power at about 2000rpm and doesnt stop pulling till about 6200rpm...and im running a set of dart cast iron heads with 2.02/1.60s 180cc runners and 64cc chambers.air gap intake and roller rockers.its a about 375-400hp,so you shouldnt have any problems with making the same with those 461 heads.

jebcamaro

iTrader: (28)

Is this a street or race only car? That compression is way too high for an iron head car unless your planning to run race gas at all times. That compression with nitrous is asking for trouble on Hypereutectic pistons as well.

2nd3rd4thgen

you can run 93 pump gas just fine, 1994/ta has pretty much the same set up as the op and has no problem running pump gas. if you want to spray it just throw some race gas in it before you spray just for some extra safety. but you will be fine on 93,

jebcamaro

iTrader: (28)

We`re not talking about LT1 motor here. They are reverse cool engines that allow you to safely run more compression on pump gas. The LT1 cools the heads before it heads into the block. The cooler heads decrease chances of detonation. Old school SBC`s can`t because they cool the block first. I`ve been around hotrodding and racing my whole life and I`m pushing 40, so been there and done that.

2nd3rd4thgen

easy now there killer. take a look at 1994/ta's sig, im not talking about his trans am he doesnt have any more, im talking about his nova with the old school sbc 355 that has pretty much the same set up as the op is wanting to run he runs pump gas with no problem what so ever.

1994t/a

No we are not...this is the sbc and bbc fourm not the LT1 fourm.

No its not to much....once you get much past 12.5:1 compression ur gonna need more octane.10:1 on the street is just fine thats what my 355 is and it runs on 93 octane perfectly fine.

No its not to much compression with nitrous with hypereutectic pistons.you could spray up to a 100 shot "if" you have the system setup properly.Mainly a good fuel system to supply enough fuel for the engine and the nitrous too and doing your homework on tuning nitrous systems

So have I and may others on here....my dad drag raced a 64 chevy II.i grew up at the track and in the garage.

.

Really?WTF does that have to do with this thread?...we arent measuring dicks here,we are trying to give informative opinons about whats asked.....btw while we are compairing dicks here,im 25 years old and have went to automotive tech school and have 4 of my ASE ratings and have done metal fabrication my whole life.I started welding when i was 9 years old.so ive been there and done that in a few years less than you.

TLM85367

yea i run reg 91 is what we have available here on my 10.5:1 355 on my truck l98 heads hyperutectic flat tops and has run fine for a long time you wont have a problem with that(really hard)oh im 21 by the way..working on cars since i was 10 lol

thirdgengta350

iTrader: (4)

i have an NX hitman kit that i'd be willing to sell. pm for details. and IMO i think you should probably go with a little bigger intake. Single plain's are amazing for bringing out the TQ in mid to higher range rpms. you do lose a tad down low though.

greatskiiiier

iTrader: (10)

he cant run roller cam unless he wants to dump $600 into it.... im doing a very simular build, 360 with forged pistons and .100 dome, 882 heads with minor work, and ive specd our the same cam for myself, so ill have basically the same motor as you, oh and dual plane intake with 600 holley
a 750 is a lot of carb for that motor, but i think youll make 325-360bhp... overall a good build for a sbc, oh and dont spray hyper pistons
and static compression isnt the only thing to do with octane, dynamic compression is what matters.. thats why i choose this cam, ill be at 9.7:1 compression, and 10.0-10.3:1 after machine work (depending on how much i remove), this is the biggest cam you can run and maintain a 8.0 dynamic compression ratio unless you get your static compression up or advance the timing

Lilsbc

Ok I have had a 388 with a comp 525in 525ex cam with 11:1 comp and a set of ported 461's and it ran on 91 octaine and ran 11.90 in the 1/4 and on 125 it went 11.o's and this was a dailey street driven car back and forth to work. Sounds like you have a great combo. I would go with at least of set of full length headers and call a cam company and have them build you a cam. Then add a stahl accordingly.

again if you are going to spray it make sure you have a fat tune up to make sure you don't go lean. You will loose alittle bit but it's a conservative tune and will stay alive. And if you are planning on spraying maybe mix a couple of gallons of either 100 or 110 in just to be safe.