The ones Im buying dont but the do have a series that needs ajustable rockers and you can dail in 5 to 20 degree reduction under soething like 3500 rpm with a lash like setting.
The best stroker 408-416-426-435 combination in stock 68 340 block
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The ones Im buying dont but the do have a series that needs ajustable rockers and you can dail in 5 to 20 degree reduction under soething like 3500 rpm with a lash like setting.
Famous Bob, comparing sb 408 to bb408, even if you had similar head flow, the Bb will have less valve shrouding, MUCH less ring drag, which by the way at one time (5/16rings?) Was 50 percent of rotating friction. It would be interesting to have a dyno comparison, but the logistics of making it an equal test would make it almost impossible.
The show engine master did a 383 mopar vs 383 chev, the mopar killed the chev at the very bottom and tied in mid and top end if i remember right.
Probably very different animals, costly for that extra performance.
My uncle races top alcohol nothing last long $$$$
Bigger engine made more power for about the same rebuild cost.
Winner = 408
Winner = 408
It got real even mid way with the slightest edge to the Chevy in HP. Do note the 383 was punched to IIRC a 396, .060 overbore I think it was.
While low end torque winner was the MoPar’s, the HP race was a tie in general terms IMO. A few ponies difference is to small to argue and scream VICTORY!
Ain’t that the truth. The higher up the power level the shorter they last.My uncle races top alcohol nothing last long $$$$
ir3333
Well-Known Member
yellow rose
Overnight Sensation
My point is if the 408 had enough cam to make power at the same RPM the 360 had the wrong cam. I wouldn't do the same valve job for a 360 as I would a 408 either. Nor would I shape the port the same.
My point is if each engine was built specifically for its displacement, R/S ratio and cam timing the 360 and 408 would produce the same power. The curve for the 360 would be higher, thus you can run a lower gear and the 360 would out run it, all else being equal.
If we are going to talk about gearing for the street that's a totally different deal.
ir3333
Well-Known Member
I think we should start a 340 vs 360 thread...it is winter for a lot of us!
True I agree but the point of the show is what the average man can do. Buying parts out of a catalog and slapping it togetter.
But If you overlap the two hp curves on those engines the 360 makes about 10 hp down low over the 408 they tie in the middle and the 408 makes 10 hp extra on top.
But people only look at the torque and declare the 408 a winner lol
Rpm and hp the best as i could read it and the x is just to make it easier to read.
408
3000 250 x 3500 311 x 4000 365 x 4500 397 x
5000 420 x 5500 433 x 6000 417
360
3300 261 x 3800 318 x 4300 361 x 4800 392 x
5300 417 x 5800 423 x 6300 420
Its plan as day that both engine are at par.
I dont get why you keep on saying im against the stroker engine?
It does have its merits and can see why 90 % want one.
Just trying to point out extra power aint one.
A 4" stroke aint a magic wand that pull power out of the Aether.
All Ive been saying to know why your doing it.
Basically to lower the powerband and run less gear and stall and maybe a better idle and thats pretty much it. And those are good reason for 90 % of us.
And then you say I can or the 360 should have been....
With that point made, me can say the same for the 408. Is can always be done better than they demonstrating video on cube vs cube with otherwise the same parts.
Point was (video) that it made more power with (OOTB-ish) parts.
Winner 408, loooooooser, 360 in power hp production and torque.
No head porting was done in the 383 vs 383.
With that point made, me can say the same for the 408. Is can always be done better than they demonstrating video on cube vs cube with otherwise the same parts.
Point was (video) that it made more power with (OOTB-ish) parts.
Winner 408, loooooooser, 360 in power hp production and torque.
No head porting was done in the 383 vs 383.
ir3333
Well-Known Member
no porting the stock 383 heads...
i can't change an intake,carb and cam and get over 100 hp?
i can't change an intake,carb and cam and get over 100 hp?
Marcohotrod
Well-Known Member
bone stock 1970 340 - 280hp. 800 Ed afb - 314. Hooker 1 5/8" headers - 326. RPM air gap - 350. Comp 268/280 .477"/.480" and 123 lb. springs - 390hp by Steve Dulcich
Ive seen you struggle with this for years now. How do you make hp ?
Ultimately is the head. If you want 500 hp you need a head capable of supplying that much air flow. Then the rest of the combo is to work with that goal cam intake carb exhaust cr etc..
Now stock heads have way more potential than the stock hp numbers.
Take the lowly 318 head. It has at least enough flow to make 300 - 325 hp and probably even more if you crank the cr and duration.
So how do you get that 300 - 325 hp out ?
The same way you would any engine. Cam cr intake exhaut etc..
Lot of times were stuck with factory cr which is gonna limit cam choice which is the 2nd major contributor to power. Because we know 4 bbl and headers only do so much on there own.
Theres no reason we cant add 100 -150 hp especially to engines that dont even make 200 hp factory.
Th only real difference between the 300 and 380 hp create engine basically is cam.
ir3333
Well-Known Member
Air gap and carb....58 hp and .477 lift cam ....40 hp.
Seems a bit high to me but i am not a builder or racer.
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Here is a lowly 440 that never got over 7.85:1 compression and went from 214 HP @ 5,500 rpm, to 441 HP @ 5,500 rpm. Dyno runs with changes made one at a time. It'll give you some idea what the individual changes will make.
Dyno testing a stock(?) 1972 440
Dyno testing a stock(?) 1972 440
ir3333
Well-Known Member
Sheesh..stock early 440's were only rated 375. I have put a few projects together but never put an engine on a dyno and am normal pretty skepticle especially of the magazines.
I know this is for a warm 356 sm blk with Dart heads but have a look at comps own dyno numbers.They are interesting for sure,especially the 262!
COMP Cams® - Camshaft Dyno Results
I know this is for a warm 356 sm blk with Dart heads but have a look at comps own dyno numbers.They are interesting for sure,especially the 262!
COMP Cams® - Camshaft Dyno Results
I think the xe262h cam is a very over looked cam. Its way bigger than any stock offerings. But not too big where it messes with bottom end too much.
Not a fricken chance and it's been beat to death. That is a 1hp per cu in engine. Seen too many of them built 340/360's and run at the track. NONE ran like a 390-400hp engine for MPH... ever!!!
And the thread is off to train wreck heaven!
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