I figured the trick flow springs would do better than that.. but i didn't buy the top end kit.. got the hyd. roller ones
Big horsepower 318 builds
- Thread starter toolmanmike
- Start date
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I was estimating based off this 323 that makes 477 hp @ 6500 rpms and 427 tq @ 4,900 rpms, making with a decent 1.32 lbs-ft per cid and 90% of of peak torque at peak power.
He just needs to find 18 lbs-ft @ 6,500 rpms to hit 500 hp (404 lbs-ft) from the 477 hp (386 lbs-ft).
https://www.motortrend.com/articles/0901phr-mopar-318-magnum-engine/
| RPM | TQ | HP |
| 2,500 | 337 | 161 |
| 2,600 | 350 | 173 |
| 2,700 | 357 | 183 |
| 2,800 | 357 | 190 |
| 2,900 | 356 | 196 |
| 3,000 | 351 | 201 |
| 3,100 | 345 | 204 |
| 3,200 | 339 | 207 |
| 3,300 | 343 | 216 |
| 3,400 | 356 | 230 |
| 3,500 | 371 | 247 |
| 3,600 | 385 | 264 |
| 3,700 | 396 | 279 |
| 3,800 | 404 | 292 |
| 3,900 | 410 | 305 |
| 4,000 | 415 | 316 |
| 4,100 | 418 | 327 |
| 4,200 | 420 | 336 |
| 4,300 | 422 | 345 |
| 4,400 | 421 | 353 |
| 4,500 | 420 | 360 |
| 4,600 | 421 | 369 |
| 4,700 | 425 | 380 |
| 4,800 | 426 | 390 |
| 4,900 | 427 | 398 |
| 5,000 | 427 | 407 |
| 5,100 | 427 | 414 |
| 5,200 | 426 | 421 |
| 5,300 | 425 | 428 |
| 5,400 | 423 | 435 |
| 5,500 | 421 | 440 |
| 5,600 | 419 | 446 |
| 5,700 | 417 | 453 |
| 5,800 | 415 | 458 |
| 5,900 | 412 | 462 |
| 6,000 | 407 | 465 |
| 6,100 | 401 | 466 |
| 6,200 | 397 | 469 |
| 6,300 | 393 | 471 |
| 6,400 | 390 | 475 |
| 6,500 | 386 | 477 |
Last edited:
Newbomb Turk
Well-Known Member
You left that info out of the comment I replied to.
WTF you don't know my combo?! that hurts man
Doesn't matter... i will never spin it over 5500.. need to stay under the speed limit!
LOL. My bad.WTF you don't know my combo?! that hurts man
RRR, have a serious question though... i'm a ******* idiot and do everything wrong and looking at my receipt for my heads i bought the TF's with the flat tappet springs, i know it just comes down to rate and such and i think they are fine. If i did my math right way back my OTN pressure is 305#,
Cam is small .525/.532 but howards doesn't list a spring rate/pressure (might be on the cam card at home)
This is the spring spec that i got, their hyd roller spring they list is about 20lb difference across the board.. i think i'm just making myself worry over nothing though..
Standard: 1.460” O.D. Dual Spring (TFS-16893-16)
120 lbs. @ 1.900” Installed Height
394 lbs. @ 1.175” Open
390 lbs./inch Rate
.650” Maximum Valve Lift
B3422w5
Well-Known Member
Per the contest rules for that years enginemasters competition, the engine was scored from 2500 to 6500, and the compression had to be under 10.5 to 1, hence how it was built.
BTW.. the 248/248 cam used in the competition wasn’t the one I used in the car.
I had a much smaller 230/236 in it. Was worried about those beehives living in a real world street/ strip environment. That 248 cam was pretty nasty…lol
Little sucker revved like a gas weed whacker
Newbomb Turk
Well-Known Member
I saw the rules. I was meaning I wouldn’t build it that low on pump gas. Unless the rules made me.
How was the streetability ?
IMO, worry point is how hard it’s used and how often.
If it’s a RPM worry, I’d say anything past 6500 unless you know how big the oil passages are & couple that with oil PSI.
10 PSI per thousand RPM is very good to have and shouldn’t be a problem.
If the oiling passages are smaller than the books recommended size, this could be an issue above 6500. Spinning past 7K, I’d recommend going above and beyond the recommended modifications and address every passage in the block making it slightly larger, rounding corners instead of the 90* turns, bushing lifter bores, etc.
B3422w5
Well-Known Member
BTW.. it was in this I used to own, I bought it as a roller, painted steel bumpers, full bench seat interior, column shifter
Could be cheaper to produce and if it still does the job needed, they are just happy with that and will say, Just send it, your good to go.”
B3422w5
Well-Known Member
B3422w5
Well-Known Member
Tell you guys what…. Anybody who ever gets or has a set of the iron magnum RT heads, they are sweet pieces.
I have zero doubt it would be rather easy to run 10’s with them on top of a roller cammed stock stroke 318 with some squeeze( compression)
3000 pound typical bracket car would do it very easily, without working up a sweat.
I have zero doubt it would be rather easy to run 10’s with them on top of a roller cammed stock stroke 318 with some squeeze( compression)
3000 pound typical bracket car would do it very easily, without working up a sweat.
Ant
Well-Known Member
First, I know UTG has been wrong on a few topics, but it's usually minor or is corrected sometimes. I don't agree with everything he says, so most of it is entertainment to me.
Second, He never said the timing chain broke.
Third, he said that he could be wrong and it's just his assumption of what may have happened, which was the timing chain being too tight that could effect things.
Fourth, whether it's intended or accidental you are putting words in someones mouth when you rely on your misunderstood memory. Even I need to fact check myself sometime so I don't make false or misinformed claims. And remember, there are other content creators here, you could accidentally make false claims about them too.
2.02 R/T heads.
Plus video;
Plus video;
The problem is finding R/T heads. You’d be lucky to find them to start with. I was with the above heads and traded a set of Edelbrock heads for them. This was the direction of the other guy and I have a curiosity about ‘em. The above are the 2.02/1.60 heads. They flowed pretty good for a OOTB casting.
Good looking heads.
I’m stalled on them like all projects around here - LMAO - grooooooannnn - LOL
They will be coupled with a small Howard’s cam. 220*’s@050 - 540 lift - 108/104 installed intake on a stock 5.9 short block with a RPM/750/Hooker 1–3/4 Super Comp headers - 2-1/2 exhaust.
2500 stall 727/3.55’s in a ‘79 Magnum.
B3422w5
Well-Known Member
Hay man, you're in Florida now. You gotta lose that NY accent. lol Nice video.
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