bvlahov

iTrader: (1)

Hello all!

I plan to build a new engine soon.
It will be 383 stroker but I wan't engine that will rev to 7500 rpm
with ~7000rpm peak power. Hp goal is 550+ crank HP.
So far I have 2-bolt '90 L-98 vette block that I'll convert to 4-bolt splayed.
Also I have bought Callies Dragonslayer crank.

For heads, I'll probably go with AFR 227 Comp ported #1121
I still haven't decided on pistons and rods, but what bugs me most is what
kind of cam/lifters/springs to go with.

I would like to get most possible out of this engine and I'm leaning to
mechanical roller setup, but I'm worried about it's longetivity.

This engine/car is not my daily driver, but it's driven mostly on street with
a few road races a year. Now, I'm not too concerned about street drivability,
but I'd like this engine to last.

What are your opinions, suggestions.......

xpndbl3

iTrader: (5)

heads are way too big. think 210cc max unless you'll have a huge cam and big compression. I have no idea why you want to rev it that high when you can rev it lower and still make 550hp

bvlahov

iTrader: (1)

I don't think that 227's will be too big for my target rpm range.

mcbchild

iTrader: (1)

You are not going to have a very streetable motor with those heads and if you could get good power out of them heads on the street and gearing required, you would only be able to drive the car very shortly and I mean only like about a mile or 2 if you are worried about longevity. Second, you really don't need to rev a 383 or bigger cube sm block that high as people are pushing 700 and 800 hp with out revving that much and still running in the 12 to 9 second range in the quarter mile. For any descent streetability, 200cc is the max you would want.

2oldFbody

Here is some info on picking the correct port volume.

http://www.gofastnews.com/board/tech...t-volumes.html

Supervisor42

This does not compute with:
We'd all like to have that engine we see at the drag strip in our car until we learn about how much they have to be worked on.
A big high lift cam that spends much of it's time in that high of an rpm range will wear the valve train components very fast (especially guides).
If you want 550 hp, a 7500 rpm motor, and something you can drive on the street; I would build a forged 350 with low lift long duration cam, big springs and a 2 stage 250 shot of nitrous. It would have a much longer power band than a N/A.
I'm guessing you want to be able to run the road course and just leave it in first, huh?

bvlahov

iTrader: (1)

Why do you think that?
I have stock bottom L-98 now and I rev it to 6300 all the time. Don't you
think that well preped block with all forged internals, high quality heads
and vavletrain that would rev ~1000 rpm more could last?
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Nice link. Thanks!

mcbchild

iTrader: (1)

No, I know people that are using the free revving 302 sb chevy with complete forged internals and they can't get them to last very long. The sm chevy 302s were made to run at high rpms from the factory.

bjankuski

There is nothing crazy with your goals. The car will not be very street friendly but you can drive it on the street. The 7000 RPM peak Hp peak works well with the 227 heads but you will need a big solid roller cam to make power at that RPM. I would call comp cams to discuss your options. I believe your goals are attainable.

mcbchild

iTrader: (1)

Goal is very obtainable, but why such a high revving motor that doen't live that long as compared to a lower revving motor that can obtain the same hp and live longer?

fast82z

iTrader: (1)

I see nothing wrong with that. My motor has been fine for this year reving to 7800rpm every pass. As far as a cam to make peak power at 7000rpm, a solid roller with about 255 intake duration should do that. My cam a couple years ago was a hyd. roller 246/254 .558/.558 112lsa and made peak power at 6400rpm. My current solid roller cam 264/271 .626/.626 makes peak power at 7400rpm. I'd have no problem using the 227's on it, and with good compression I'd place it more around 575+hp.

firebird896

Well Im trying to build a 383 stroker and everyones givin me a somg and a dance to get a crate instead, i already have a block ready to build, all i need is wat exact kits to get

Good luck

bvlahov

iTrader: (1)

That are more less numbers that I'm aiming for. I allways set my goals a bit lower. Better to be surprised than dissapointed.

As I said, my car is driven mostly on the street, but with ~3500 miles/year
it's far from being daily driver. With that mileage, I don't see why, with good
maintenance, ~7000rpm peak power engine couldn't last!?