zoxygen

What are the limiting factors to how high these SBC can rev?

Is it possible to make a 7000rpm-7500rpm SBC? (excluding the LS7)

What I'm really asking is what it would take for me to build a 7000rom-8000rpm SBC?

or is it just impossible?

ram09

iTrader: (1)

Get a 4.00 inch bore block, put a 3.00 inch stroke in it (302 ci) and rev to your delight. Old school style, this is what they used in the 67-69 Z28 Camaro.

zoxygen

the real question is how much HP could I make NA from a 302 keeping the revs high? Also how how high of RPM's could you get out of a 302?

Thanks!

johnjzjz

Hi this is an add i have on racing junk for a camaro we have it explains what it takes we build this sort of motor be carefull of valve springs they are the killer in high rpm motors jz




it has a 355 SBC 1970 4 bolt OEM steel crank coated C/A bearings Z 28 style pump anti cavitation molodon pan 7 qt w/windage cloyes alloy timing cover w/roller, cam correct w/ L/S trencher crowler L/W rollers manley pushrods.080 black carbon finish Jessel rocker shaft 1.5 int 1.55 ext 5.7 eagle ESP H beam rods with 2000 bolts brc L/W pistons .090 wall pins 1600 bob weight C/A total seal type rings AFR down nozzle injected style 227 spread ported heads 208 int 160 ext 1.550 pac alloy comp springs TiT 10* retainers fluid damper balancer edel super victor manifold port matched and alky jet drilled with plugs HP series holley 750 race gas carb Mallory pump MSD 3 AL crank trigger MSD shoenfield stepped 1 3/4 to 1 7/8 X 3-1/2 collector 30 inch runners 9 inch collector sippers and egt bungs (lambus) both sides and they are rapped w/tan color rap REAR QA1 shocks ladder bar suspension 2818 lbs car with a 270 lb driver front is 1590 rear is 1498 -- 3088 total w/ driver runs in the cool 10:30 in the heat 10:50 foot breaking shifting at 8000 / 7800 traps one tenth trans braking faster with ( A ) cam motor will go as high as 8500 but is to small a cam so it only revs does not go any faster jz

Cali99SS

iTrader: (1)

http://s5.photobucket.com/albums/y19...nt=385dyno.flv

This is my 385 Cu.In. 9000 RPM engine. The video shows it going to 8000. It makes 589hp @7700 RPM and 449 Lb. Ft. @ 6000 RPM.

23* Iron Eagle platinum heads CNC'd to flow 333cfm @ .800
Jesel shaft rockers
PSI springs
These are really the only things that are not real common.

Eagle cast crank
SRP forged -16cc pistons
Crower 4340 rods
GM 4 bolt block

67SS&99SS

iTrader: (7)

You can destroke a 400 to 377 cubic inches and basically have a bigger 302 that will make much more power, but still rev as high. Building a high revving motor isn't hard to do, its just making sure that the bottom end and valve train will support the rpms. I would recommend a solid roller if you are going to try to turn over 8 grand. I know higher rpms can be achieved with a sold flat tappet but the roller would spin higher easier and not have as much friction robbing horsepower.

EPP

iTrader: (22)

I have a Holley Keith Dortin 3 pc intake manifold in stock for hi revving small blocks, if you're interested. These intakes look exotic! Bob

helgabeast

this guy i know that races latemode... he has a 380" sbc.

4.155" bore x 3.50" stroke
its all aluminum, 2.08 heads w/ a crazy valve angle that flow in the 350's or so, 13.5-1 or so static comp, 1050 cfm carb, titanmum rods(i think), huge cam in the upper .7 :'s lift, and a host of other crap.
the engine builder said it made like way upper 800's at like 8900 rpm.
that would be sweet in a real deep geared street car... a setup like that wouldnt yield good hp below 4k though.

i almost put a 350 crank in my 400", but just bored it out instead. figure i didnt need the hi revver for the model a'

later

mongse

iTrader: (2)

A lightweight rotating assembly will go a long way in determining how high you can rev the engine w/o having the rods try to liberate themselves from the block. Dirt track and circle track motors are a great example of this. Of course, price out a 385 w/ SB2.2 or a 357 w/ some Yates SC1s and prepare to be amazed.

ChevyWeatherman

iTrader: (2)

Yeah it all depends on the parts. My friend has a Kriner-built 414 small block that will turn 9000-9200 no problem, and that is a HUGE stroke to be running that kind of RPM at. It has T&D shaft mount rockers, giant Isky triple valve springs, titanium valves, super nice carillo rods, and a Sonny Bryant crank. **** I think the crank in that motor is like $6200 new.

It runs alky and made ~860 HP, can't remember the power peak, but is was right around 8200-8500. It also sits in a 1220 pound car.

mongse

iTrader: (2)

On the topic of high dollar cranks, a friend of mine has a rotating assembly for a 4xxci Ford that uses an LAE Kryptonite crank and Carrillo rods. He got it for cheap from a guy who was neck deep in depth, but still paid $2,000 for the rods and crank.

Burning Rubber

iTrader: (1)

my neighbor has a 383 stroker motor that turns 7500-8000

zoxygen

Thanks for everyones info, some of these seem like Racing engines. I need advice on making a streetble engine that will give me 400+hp at 7500-8500 or higher if I can safly do it.

Thanks!

mongse

iTrader: (2)

You can make 400hp @ 6000rpm and be perfectly streetable. High rpms = more maintenance.

zoxygen

Ya I know, Its just hard to explain why I want to do it ya know? I jsut want to do a project on building a high revving sbc. high rpms = fun

Sneakin Deacon

with the way technology has evolved, there is no real reason to do a 377 out of a 400, or a 327 from a 350 anymore. nowadays the balancing is capable of being much more precise, which is a big part of a motor staying together at the higher rpms. just remember, though, the more cubes, the less rpm that is needed to make the power. id preferably take and build a 406 with some decent heads, only sping 5500-6000rpm, and keep it for quite some time, and make some good hp/tq without breaking the bank on parts

hammrman31

small block chevys make hp. at high rpm. a 302 dz can get you to 7 g. if you add aftermarket heads,the right tuning, solid bottom end.good engine work, you,d be turning 8k. ask roger penske. damn where's smokey,grumpy bill, i swear these dudes have run over 10k . all day long.

zoxygen

Would a turbo application be considerably better in a 8000 rpm revving engine then a 6000? It seems It would but would it be MUCH better?

RDTA

iTrader: (1)

how does 9k sound(motor has seen 10k 24 yrs ago) Lt1 pink rods, steel crank and trw forged pistons. It dont seem like much as far as parts, but im 24yrs old and this motor is one my dad raced in 1977. It has just been ringed and bearing. [IMG][/IMG]

AutoRoc

This guy wants a V-TEC Honda engine it sounds like. Not a lot of power at a huge RPM and really streetable. 99% of us here try not to build something impractical and inefficient. You're asking how to turn pieces of metal really fast and you're not seeing the whole picture. 400+ hp can be made at 5500rpm with a common crate engine and very few aftermarket parts.

I suggest a Honda Civic with a turbo kit. Spin it to the moon and impress everyone with your 6" tachometer.