355 Build Advice.
Thread Starter
Teching In
Joined: Jul 2008
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355 Build Advice. 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.
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.
10 Second Club
Joined: May 2009
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From: over dere
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
Thread Starter
Teching In
Joined: Jul 2008
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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
i think my next upgrade will be a nice set of aluminum heads so i can handle the compression better
On The Tree
Joined: Jul 2007
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(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.
10 Second Club
Joined: May 2009
Posts: 3,427
Likes: 226
From: over dere
(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.
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On The Tree
Joined: Feb 2007
Posts: 156
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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...
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.
On The Tree
Joined: Jul 2007
Posts: 105
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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,
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.
On The Tree
Joined: Jul 2007
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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.
On The Tree
Joined: Feb 2007
Posts: 156
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We`re not talking about LT1 motor here
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
I`ve been around hotrodding and racing my whole life
I`m pushing 40, so been there and done that
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.
Last edited by 1994t/a; Jan 27, 2010 at 02:23 PM.
Teching In
Joined: Aug 2009
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From: 85367
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
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.
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
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
Last edited by greatskiiiier; Feb 13, 2010 at 06:17 PM.
Staging Lane
Joined: Jan 2010
Posts: 52
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From: Gaines, mi
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.
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.
