Thread: Lacking power need more!

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Well About two years ago i did 350 sbc swap into my fiero. Now i want a little more power to the ground. The motor made 309hp@4450and 386ft/tq@3768. Im using 74CC 882 casting number. Im currently running a 570 street avenger Edelbrock RPM intake, Patriot 1 5/8 to 2 1/2 collector. Stock cast pistons, 8.5:1 comp ratio and the cam thats in there i could not tell you with my life about anything about it lol. All i know is its not big at all lol.

But the Just of things I wanna hear what kind of head cam intake carb combo's are good power makers? Im not the best at matching things up but this is what i was thinking of running, Leave comments be harsh and truthful for i love criticism. My goal is 425-475 horse. Ill be happy as a fat kid eating cake!

Head choice
http://www.summitracing.com/parts/AFR-1040/
Airflow Research, 195cc intake 65cc chamber, 2.05/1.60 valves alluminum heads.
Cam choice, This is what im weiry about.
http://www.summitracing.com/parts/LUN-60104LK
Lunati voodoo cams, Duration@.050 233/241 Lift .504/.525

Intake
http://www.summitracing.com/parts/EDL-7501
The traditional Air Gap, and paint it black black because thats the theme im going in my engine bay. And the Nascar version one is 150$ more not worth it lol.
Carb
http://www.summitracing.com/parts/HLY-0-80675/
750 cfm mechanical secondary.

Thanks for reading hope you can give me advice.
Prox.

Welcome Prox – hopefully you will find us to be the resource you’re looking for. The 350 in a Fiero swap is certainly a popular one and there may be several here who have firsthand knowledge and some hands on experience that you’ll find beneficial.

As to your engine build – we need more information to begin to help. Is this an automatic or a standard shift car? Is this a “V-8 Archie” kit that uses the stock transaxle in the stock location? Do you know what the transaxle ratio is? The stock Fiero transaxles and the Isuzu five speeds are pretty good, but you may be disappointed the first time you try and hook up 425+ horsepower.

Is there a reason that you’re shooting for 425-475 HP? That’s a big jump over what you have and that last 50 – 100 will be real hard to get with stock 8.5:1 cast pistons. I would encourage you to look at the entire “package” and ask yourself what you really want to see when you’re done. The 750 mechanical Holley will be a disaster under 2,000 RPM. You’ll need more compression and a reciprocating assembly good to 6,000 plus to really take advantage of the head and cam combination you’ve selected.

I would encourage you to consider trying the Performer RPM manifold and an Edelbrock with vacuum operated secondaries or a QuadraJet on the heads you’ve got (remember if you use a Q-Jet, it’s a different manifold). You’ll probably see a nice increase in response and a real nice improvement at speed - especially with the Q-Jet when the secondaries open.

If you really want that much HP, you’ll be better served if you pull the engine and start from the bottom up. Lots of people talking “street racin’ smack” will tell you they’re pulling 475 horse, but few are and to really see that kind of HP, you will need to replace just about everything except your block.

Others will chime in – again welcome and keep us informed!

Regards,
Glenn

Originally Posted by glennsexton

Welcome Prox – hopefully you will find us to be the resource you’re looking for. The 350 in a Fiero swap is certainly a popular one and there may be several here who have firsthand knowledge and some hands on experience that you’ll find beneficial.

As to your engine build – we need more information to begin to help. Is this an automatic or a standard shift car? Is this a “V-8 Archie” kit that uses the stock transaxle in the stock location? Do you know what the transaxle ratio is? The stock Fiero transaxles and the Isuzu five speeds are pretty good, but you may be disappointed the first time you try and hook up 425+ horsepower.

Is there a reason that you’re shooting for 425-475 HP? That’s a big jump over what you have and that last 50 – 100 will be real hard to get with stock 8.5:1 cast pistons. I would encourage you to look at the entire “package” and ask yourself what you really want to see when you’re done. The 750 mechanical Holley will be a disaster under 2,000 RPM. You’ll need more compression and a reciprocating assembly good to 6,000 plus to really take advantage of the head and cam combination you’ve selected.

I would encourage you to consider trying the Performer RPM manifold and an Edelbrock with vacuum operated secondaries or a QuadraJet on the heads you’ve got (remember if you use a Q-Jet, it’s a different manifold). You’ll probably see a nice increase in response and a real nice improvement at speed - especially with the Q-Jet when the secondaries open.

If you really want that much HP, you’ll be better served if you pull the engine and start from the bottom up. Lots of people talking “street racin’ smack” will tell you they’re pulling 475 horse, but few are and to really see that kind of HP, you will need to replace just about everything except your block.

Others will chime in – again welcome and keep us informed!

Regards,
Glenn

Thanks for your honesty, I was also looking to go that route changing the bottem end for that extra punch, But if i do up the compression ratio a touch i dont wanna run anything radical of a dome, I thought to come to mind this kit was priced pretty good, everything forged what are your 2 cents on this kit? http://www.summitracing.com/parts/SCA-1-41605-1
The Kit was archies kit well just the adapter plate, everything else i assembled my self. Was easy lol. For the gear ratio here are the ratio for every gear, its a 5 speed standard 1st3.50 2nd2.05 3rd1.38 4th0.94 5th0.72 final3.61
Getrag/muncie 292 design.
And for the 475 horse i was just kind of ball parking it lol. Even before you said anything i was thinking of doing the "full" build but i seen so many people running around the city that are making insane power with just new cam/intake/carb/heads i was just seeing what you guys would have to say lol. Biggest thing is the car weighs 2600 lbs with the motor in it and 2800 with my fat ass in it full of fluids. So compared to alot of the muscle cars out there its a tiny bit "lighter" lol

ask the tech inspector, and give him all the details he will cook up an amazing game plan that will more than likely save you money and make more power , when i get a new project i have a fresh unassembled zero deck 306 ford i need to taylor to the application , heads cam etc???

Someone posted these links to SBC combos on this site a while back. You should be able to find a combo that fits your needs here:

http://www.ryanscarpage.50megs.com/combos1.html
http://www.ryanscarpage.50megs.com/combos15.html

I just ran a combo on the DynoSim this morning for a fellow from this forum.

'96-'99 Gen I 350 block, roller cam, one-piece rear seal.
Scat 3.750" stroke crank, cast steel.
Eagle forged 6.000" rods.
SRP forged pistons, 16cc dish, 1.125" compression height.
Fel-Pro 1003 head gaskets.
Airflow Research aluminum heads, 195cc intake runners, 68cc chambers.
Edelbrock RPM or Weiand Stealth intake mounting 750 vacuum secondaries carb. Have to agree with Glenn about the Quadrajet. Best carb ever designed. Here's the guru if you want to run one. Call him up and tell him what you want it to do and have him build you one....
http://www.cliffshighperformance.com/
CompCams 08-423-8 hydraulic roller using 1.5 rockers and installed straight up.
http://www.compcams.com/Cam_Specs/Ca...?csid=188&sb=0
1 3/4" long tube headers.
Bore block 0.030", zero deck at 9.000". Makes a 9.43:1 SCR 383.

RPM HP TQ
2000 147 385
2500 185 389
3000 239 419
3500 304 456
4000 364 479
4500 419 490
5000 457 480
5500 483 461
6000 490 427
6500 456 368

I factored the AFR published head flow numbers by .95 just to make sure and be real about the combo. Makes a nice 490/490 motor. I ran the combo first with Patriot heads, making 425 hp and 460 torque. If you want to make hp and torque, you just have to step up to a good set of heads. That seems to be the key. I would use a 2500/2800 stall converter behind this motor with a good set of gears.

I really like combo number 102. Amazing numbers with just top end bolt ons. I been doing alot of research and i do really like the AFR heads they seem to be the "ubeatable" head. Its true what they say, You get what you pay for concept Now just for a good cam selection!

102 won't make much of a street motor with hp peak at 6500 and torque peak at 5500. Too much cam for a street motor. Low rpm numbers would be horrible and low rpm's are where you use the motor 95% of the time on the street. You want the torque peak at 4000/4500 for the street, or even lower if you are going to limit the peak rpm's and build a gruntmobile.

What do you think the best build that would make for a light car like the fiero and make 400ish horse power? Im all ears. What do you think the best header size/ collector size/ exhaust size and muffler type?

Originally Posted by Proxemus

What do you think the best build that would make for a light car like the fiero and make 400ish horse power? Im all ears. What do you think the best header size/ collector size/ exhaust size and muffler type?

Ummmm....gosh, I don't know.....maybe scroll back up to post #6...???

lol i thought u were talking about something else. My bad lol. Some times i dont listen :P lol