OatBoy

My Neighbor said he wanted to try building an engine with a huge bore, but a tiny stroke. he said he wanted something new, and different since the rage these days is the stroker motor. i dont think he's figured out his setup yet but what do you guys think of this?> it would rev pretty high i guess and probabely not have too much low end torque. Have any of you tried something like this? thoughts and ideas

PRNDL

sorry, never mind.. I thought it was going to be the way your sister described her new boyfriend.... or something like that! :lol: MJ

Shark Racer

Huge bore, tiny stroke?

Never heard of it. *cough* 302 *cough*. 4x3

or 327. 4x3.25.

Of course, a 327 is a "stroked' 350. ;)

377s are the rage these days, which are "stroked" 400s. That is, a 400 bore(4.125) with a 350 crank(3.48). I think that 350s have a very good street powerband. 377s would probably be similar to 327s, with much more torque.

-Steve

Sting Raycin

Wouldn't a 350 be a stroked 327?

Twin_Turbo

He meant destroked :)

PatsLs1vette

some of our circle track guys guys are running the 3.25 stroke in the 400 block too.

Flareside

Perhaps he should look at some of the offerings from Honda... :lol::lol:

VegasJen

chevy 302 :yesnod: oh yeah, baby! :reddevil
327 block (4" bore), 283 crank (3.25" stroke)= big bore, destroked. not good for a light car since they sacrifice torque but screaming on the top end, a top end that doesn't even wince at 7000rpm.
actually, there are a bunch of examples of stuff like that. the next 'production' version is the 427. yeah, it was before the 454 but you can't get a 427 any more. 454 is just a 427 with a longer stroke. destroke a 454 and voila! hotrodders have been building 377s for a long time. if i remember right, that is a 400 block with a 350 crank= destroked 400.


[Modified by clutchdust, 8:06 AM 11/6/2002]

Shark Racer

I'd been under the impression for a while that "stroking" a motor simply meant changing the stroke on it. :) But yes, you are right. I did mean "destroke".

-Steve

PS Go crazy. 400 bore with 283 stroke. :)

MikeC

And make sure you get the proper parts for that high revver(you internals have to be really good to go past 7 grand

Fevre

I rather stroke it and gain the power down low, funnier to punch it at 2000 rpm's and burn the tires than rev it to 7000+ and throw a rod through he oil pan. JMHO


[Modified by Fevre, 10:52 AM 11/6/2002]

ericshaw

:yesnod:
My 400 feels as plesant as my V6 Camry around town but once I'm in the upper rpm's... :seeya


[Modified by ericshaw, 11:14 AM 11/6/2002]

Wrencher

I have a good example of that principle in my shop. The 409 Chevy has a relatively short stroke and a huge piston. When it was in a car ('59 El Camino) I can tell you it revved up incredibly fast, probably my favorite engine to date. The main problem with the 409 was that the mass of the rotating assembly was so great, at High RPM's and under load it would crush and spin the mains right out of the caps! They solved all those problems with the BB we all know and love. Over-square bore engines also wear out more rapidly than a long stroker.

Hans

VegasJen

i'd agree with wrenchers statement. if you destroke anything, IMO it would be better to go 'oversquare' on a small block. big blocks are slinging so much weight around as it is, it just scares me to hear about one hitting 6500rpm. i know some will do that and hold together, it just plain scares me. on the other hand, if it's put together very strong on the bottom end an oversquare SBC can hit 7000 all day long. i still beleive it's mostly a race engine for a light weight car. for a heavier car that sees alot to all street duty, a square (same bore and stroke) is likely the best solution or a longer stroke (383, 388) may be even better. :)

Kevin_73

How about Teledyne Continental, or Lycoming :D

Wrencher

383's are a great package 'cause you have decent torque (longish stroke) and yet with the right rods and pistons (strong and light) you still get 7500 rpm out of them. That torque is real nice and I wish sometimes when I drive the BOSS that I had it. I have a power band that runs from about 3200 to 7000 and you have to do a lot of work to keep it there.

Hans

burners

That is exactly what the NASCAR boys do. 4.125 to 4.155 bore with a stroke to yield 348 CID. That's how they can rev to 9000 rpm. Personally I like the idea. I would much rather have a high revving engine than a low rpm grunt engine (within reason). It's just going to be more fun to drive and shift through the gears.

TedH

I'd suggest just finding a sound 327 or 350 and rebuilding it; forget de-stroking unless you are planning for road-racing where a high winding small-block is wanted.

If your friend's heart is set on building a de-stroked engine, have him take a 327 and add the 283 crank (late 283) and you get a 302. Not sure of the rods to use (283 or 327).

OatBoy

I think he wanted more displacement than a 327 or even a 377, i talked to him today, he's not even sure if he's going to do this but he would be putting it in a nova, and he wanted enough cubes to have at least decent low torque, although he would be making the majority of the power at high revs.

Schmucker

There is a difference between the 302s GM put out and the 302s you get by destroking a 327. The real 302s had large journals so they were better :D My dad has a real 302 in his '64. That motor is insane. 13.5:1 compression, tunnel ram, revs past 10,000 with the clutch in, and he launches there too.