Just wanted to hear your guys thought on an engine I was considering building . I was going to go with a 350 4 bolt block bored .030 over with 6.0 inch rods with a 400 crank and a 3.75 stroke to make a 383 stroker motor. 10.7 approx compression ratio, AFR 195cc heads, forged steel crank, forged H-beam rods, comp cams extreme energy 284 cam 240/246 duration at .050 .507/.510 lift with 1.5 roller rockers 2300-6500 rpm , 2500 stall with a th-400 built trans. The rearend is a 8.5 10 bolt with 3.55 posi. What do you guys think of this combo?
i think this combination is good except i would tend to want more converter. it all depends, this looks like a street setup, as you know anything goes there. i dont like getting my but kicked on the street.
A well-built turbo 350 will get more horsepower to the rear wheels due to less rotating mass than the 400 turbo. A 700r4 will give you a lower first gear but still has the overdrive if you like to cruise on the hiway at all.
With this setup, could I use it as a daily driver? What kind of stall would you suggest? I would like to put this in my daily driven 70 Nova. Anybody else using a setup similar to this as a daily driver?
I'm basically just writing this to see if anybody would disagree, but I'm thinking looking at the setup, that you don't really need to spend that extra money on those expensive rods and crank. I'm pretty sure a cast crank and stock if not really close to stock rods would work.
There are a few things that need more info. If you mean daily driver and want an engine you can put a lot of miles on I'd back off on the cam a bit. That much duration even on a stroker will cost a lot of bottom end torque and make a lazy motor. 6 inch rods are nice in a race engine but they push the rings pretty high up and get the pin into the oil ring land. For longevity I'd suggest sticking with a 5.7 rod. H beam rods may require some extra grinding on the block to clear than an I beam but will do fine. If you're using an 010 block double check the webbing to be sure there is no cracking.
That sounds like a very good combo to me. I would have to agree that adding 1.6 rockers would help. The car motor will be choppy, but i think it will be pretty streetable. I would look at a 2800 stall. With the heads you are using, the motor should not be lazy, the smaller runners will promote better velocity, and make for a snappy motor. The cam is rated to come in at 2300 rpm, but that is based on a 350 cid motor. On a 383, that cam will come in about 200-300 RPM sooner, so it is probably just about the right size for what you are doing. I just built a 383 with an all cast steel Eagle rotating assembly in a stock block. We did not use a small base circle cam, and the rods were still nowhere close to hitting. Aftermarket rods have less of a chance to hit than stock because they are shaped different. I was worried about the compression height and piston pin distance from the oil ring, after some research, I found that it would be fine with a 6 inch rod. Also a 6 inch rod will help make the rings rub more softly on the cylinder walls which will make the motor last longer. I would go with the RPM air gap intake.
Get a 2,800 to 3,200 stall if you aren't going to use it everyday. Get a 2,200 to 2,400 if you are. The reason why is the engine will wind up to those stall numbers every time it gets put under load. It would drive me nuts to have to have the 3,200 stall converter in traffic everyday, but on the weekends it would be optimum for good launches. 2,400 should be enough to eliminate the low end flat spot that converters help avoid getting stuck in.
The base circle of a cam is the round part of the lobe where the lifter rests while the valve is closed. A small base circle is one in which the base circle is on the same level as the cam core. This gives more clearance for stroker motors.
I like your engine combo, I also agree that using 1.6 roller rockers would be better that 1.5's. If this car is going to see regular action at the track I would beef that 8.5inch 10 bolt up a little. If anyone else would care to elaborate on this idea I'm sure novatech would appreciate it, if not then novatech there are some great threads on this site about what to do to your 10 bolt.
What are the disadvantages to using a small base circle cam? If they were overall better, we'd all use them all the time right? Perhaps they're just more expensive. BTW, I'm building a stroker(not to change the thread topic here) and wonder if a 383 needs this small base camshaft? If a stock 400 doesn't need it, I shouldn't need it either right?
Comp Cams advice on small base circle cams: They are okay with a roller cam (billet), but not with a flat tappet cam (cast iron). They say the cast iron small base circel cams are prone to breakage. I would hate to try to prove them wrong--and then find out they are right!
I think it was 1971 .I was in my 67 chevelle with 4 speed 427 . run like hell.I raced a 1969 camaro Z/28 302 . The boy's dad got him the car . And he came throw town raising hell . He wanted to race so i said you got some money. So we went to the strip a good 1/4 mile going across the state line . We were at the line and he looked over and said i'm going blow your *** of the road . . When they said go .I was gone .He sait there spinging . The 302 was not what they say they are . I got my 10 dollar bill. He never raced no one .That i know of. . The guy got killed about 4 week's lader. That was good time's.70 custom/10
Surely the 125 extra cubes didn't help any did they 70custom/10? And you said he was sitting there spinning.. So he was obviously and inexperienced driver. That isn't a whole lot to brag about.. And it makes you look even worse when you don't use spell check. I know your new to the board and all.. But just remember that its small stuff like spelling and bragging how your big block smoked a small block that makes you look bad from the beginning.
OK Silver Camaro, king of English spelling and grammar; let's take a look at your expert piece, shall we? Look for the parentheses.
Silver_Camaro said:
Surely the 125 extra cubes didn't help any (missed comma) did they (missed comma) 70custom/10? And you said he was sitting there spinning.. (spinning, so- no new sentence here) So he was obviously and (I think you meant "an" here) inexperienced driver. That isn't a whole lot to brag about.. And it makes you look even worse when you don't use spell check. I know your (you're is the proper word here, not your) new to the board and all.. (all, but) But just remember that its (it's) small stuff like spelling and bragging how your big block smoked a small block that makes (this is plural, only need to say make. One thing makes, many things make) you look bad from the beginning.
Secondly, they guy who wrote that is old enough to be your father (he's 44). Ya know, it's the little stuff like disrespecting somebody who's more than twice your age and ripping on somebody for no reason that make you look bad from the beginning. Lots of knowledge to be had around here provided you don't burn your bridges...
Hey I just said spelling.. Didn't say anything about grammar. And I understand the whole respect your elders thing.. I just find it rather annoying and inappropriate that he tells a useless story about how he once had a big block that smoked a 302. This thread is about engine, and trans setups. Not 30 year old illegal street racing stories. Those belong in the lounge or the dump (which is where this one is getting close to belonging). And I personally don't know how much experience he has. I'm sure he probably has more than myself which is great. Its always good to have new people with experience around. I just believe that he needs to organize his thoughts a little better. Stories in the lounge, useful info in tech forums, and wise cracks anywhere he sees fit.
Small base circle cams cost more, and if you are using aftermarket rods, they probably will not hit on a regular cam. I just built a 383 with the Eagle cast steel rods and crank, i used a normal cam and it was nowhere close to hitting. I dont know how much of a chance there is that a stock rod would hit though.
nice comeback silver. i was thinking myself, "what does this have to do with the thread?" and also that the kid didn't know how to drive. as for bb vs. sb, in 72 for example, the year of my SS camaro my 350 only was rated at 200hp but there was another rated at 255. i think the 396 bb was rated at 245 or 250, so it's not like the bb's are all that much better stock. and this is factory rating as well, and chevy sandbagged big time on the hp rating i think. i just think it's weird that a bb would be rated at less hp than a sbc. as for the 302dz engine, it's pretty much regarded as a bad ***. but i digress. hopefully my punk-tution is okay. you dont need a small base cam unless you have stroked your 350 because you wont have any clearance problems in a stock engine. as was said previously.
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