Hey guys,
I am new to this forum, i have been a Ford guy up till now. I have just bought a 79 chevy c10 show truck. It has a gm goowrench 350.. (the one for like 1250) It has stock heads, and edelbrock rpm intake and a speed demon 750 carb. (the reason for the big intake parts is the anticipation for either some afr, trickflow, or dart heads. Any reccommendations.??? Now my question is. How much nitrous can this motor safely handle??? 150? 200? any info would be greatly apprieciated. Thanks alot.
Tim

I wouldn't give it more then 150. I would also run a seprate fuel system with good gas in it.

125HP, TRY A POWERSHOT PLATE SYSTEM.

thanks guys.....now what puts the limit at 125-150? what is the weakpoint...also what heads and cam do you recommend.....any body know how much a 79 chevy c10 long bed weighs? i am curious as to what i could get this down to in the quarter....we shall see....might do a stroker for it. I am totally new to chevy motors, and i am so confused when i see all the different size heads listed in summit! and advice would be appriciated!

That's a heavy vehicle to try and get low ET's out of. Good luck http://www.camaros.net/forum/wink.gif.

Now, as for heads, AFR are the best around, but also cost the most. The Trick Flow 23* aluminum heads seem to be the best head for the money right now. I'll leave camshafts to someone else.

As for the N20. I wouldn't spray more than a 150 shot, if that. That shortblock has cast pistons(maybe hyperuetectics...), stock rods, cast crank, and stock fasteners. You'll find the limit of those pistons really fast with nitrous! And like someone else mentioned, plumb a dedicated fuel system that only uses race gas for the n20.

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79' Z28 4-spd- built 355, TRW 10:1 forged flat tops, WP SportsmanII heads, Crane Energizer 230/230 duration .480"/.480" lift, Edelbrock Victor Jr., Holley 750cfm, Dynomax headers, dual 3" flowmasters :) 3.73 Posi 10-bolt

Thanks for the info...the trick flow 23 degree heads seem like they are a good deal....I do realize that the truck is very heavy. but if i could get it into the low 13's high 12 i would be happy! any more info would be great! Thanks

I would only go as far as a 150. Dave Vizard got one on a stock block STOCK up to 1,000+ hp before the darn thing pooped out but yes 150 would be the most. They tend to amplify problems when use so make sure your motor has good rings and doesn't run lean.

Drop in a big block

how much horsepower can that 4 bolt main block take? suppose i put in a good set of internals....say a forged 4340 scat crank, with forged scat h-beam rods, and je pistons....for 383 cu inches...what will that block handle? i have tossed the idea of putting a d-1 on top of the motor, more for the coolness factor rather than a big block.

Say i had a good cam, afr 195cc heads, rmp air gap intake, and a 750 speed demon carb, with a 383, and 10-12 lbs of boost from a d-1 ...think that would put the truck in the 12's? with some 4.11's and sticky tires...along with a good stall?
what do you think?

How hard are centrifical blowers to tune on a carb...i had one on a ford efi motor, and boy are they fun....what about on a carbed motor??


thanks guys....your a big help..

I'd say the weak point is the cylinder walls. Even if you put all the high Dollar crank, rods, and forged pistons in it you could still crack a cylinder wall. Cast pistons are NOT forgiving if you get any kind of detonation on the bottle - that's your limiting factor right now IMO. Even with a stout bottom end and forged pistons, stock blocks are probably reliable to 500 HP or a little more.

Keep in mind that NOS systems spray the same amount of fuel/nos mix regardless of RPM. So if you hit the button at 2000 RPM you still get 150HP worth of juice. Since the engine is spinning slower it cannot move as much air and cylinder pressures go through the roof.

The Desktop Dyno program talks a little about this (in the help section) and mentions that stock HD engines can only handle about 300 psi (brake mean effective pressure or BMEP) before something breaks. For the reason stated above, as RPM increases BMEP typically decreases fairly quick in a NOS motor.

Interesting stuff.

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68 Camaro, 383 small block with TH350 trans. 11.98's at 111mph and never trailered.

so what would be my next reliable option as far as a block would go? i dont want to spend 2 grand on a block! thanks guys

I've read that most 010 4-bolt blocks can go 600hp before much worry. Just so long as you keep a minimal overbore. You may consider 'hard blocking' up to the freeze plugs. This adds quite a bit of strength.

There is no in between. It's either a 'hard blocked' stock block, or a $2,000 aftermarket block. I think a stock block could handle a 383 with 8-10 lbs from a Vortech S-trim/D-1 procharger. Nitrous is a different story. Like Eric said, with N20, cylinder pressures are extremely high at lower rpms. Just some stuff to think about.

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79' Z28 4-spd- built 355, TRW 10:1 forged flat tops, WP SportsmanII heads, Crane Energizer 230/230 duration .480"/.480" lift, Edelbrock Victor Jr., Holley 750cfm, Dynomax headers, dual 3" flowmasters :) 3.73 Posi 10-bolt

thank you very much for that info.....this is a big help, although somewhat a dissapointment! I thought a chevy 4 bolt block could handle more than 500-600 flywheel hp. but oh well. thanks guys