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Author Topic:   327 0r 350?
cambra
Member
posted October 11, 2004 01:58 AM
In the big world of dirt track racing I have always wonderd which is a better motor if you had to choose between the two,a 327 or a 350? looking past the cost and availability.But performance wise. stock vs stock and tweaked vs tweaked. which is the better stock and which is the better tweaked. need some opinions,thanks.


slater00
Member
posted October 11, 2004 08:29 AM
I have ran 327 and 350 in my street stock,but I only won in the 327, I think it's because it's a dry slick track,the more we put behind the wheels the more the tires would spin, I think a heavy track would be different, but it is up to the driver to see how comfortable it is on the track.

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beachracing
Member
posted October 11, 2004 04:26 PM
I had to run a 327 with 8 races left in the season, and although it lacked at times, especially as far as lower rpm acceleration, it did well on a dry track, and it helped me log my first A-main win. If you are limited to running a stock 327 bottom end, be careful with the duration, with the lack of stroke, the duration needs to be kept to a minumum so it will have torque. Torque gets you out of the turn, horsepower gets you to the next. Power wise, the 350, if it is cammed right, with a good set of heads.


robhbk24
Member
posted October 12, 2004 01:51 PM
if you have tight turns that you loose alot of rpm then build a 327 (they rap out faster) i ran a 327 all year and could out run everyone on the track but i run figure 8's on a small tight track high bank
i was out running 350's, 383's , and 406's at the track i run
drive hard or drive home


cambra
Member
posted October 17, 2004 09:10 PM
Which would be best for a short track? and what is the difference between hypertectic and cast pistons? thanks alot

[This message has been edited by cambra (edited October 17, 2004).]

beachracing
Member
posted October 17, 2004 09:26 PM
There is a difference in crank stroke, the 327 uses a 3.250,while the 350 uses a 3.480 stroke. If you can afford to build a 350, do so. A 327 as a back up will work if it has good heads,proper cam, etc. The 327 lacks lower rpm torque, and does not accelerate as a 350 would in that situation. A 327 will work, but you have to keep your momentum up, and stay off the bottom,except if the track dries, and your searching for some tacky surface on the bottom.


robhbk24
Member
posted October 18, 2004 01:52 PM
dependign on what class and your engine rules there are times wehre a 327 may work better than a 350. If you are limited to stock heads then the 327 may be able to breathe better longer whereas the 350 may get choked off because the heads cant keep up. Also cam selection will come into play as well. The 327 could get by with a smaller cam, helping the bottom end but still run good up top becasue of the inherent high rpm ability of the bottom end. If you can build it to optiize ea engine airflow needs (i.e. aftermarket heads)then the 350 will outtorque the 327 but the 327 will rev faster and have better HP on top, just like the difference between a 400 and 377, assuming you have it geared correctly to take all of this into account. The shorter stroke works better for high rpms but you give up some bottom end.

Long story short, either one coudl be made to work well. You jsut have to look at the whole combo not just one part. But for eceonomy reasons I would go with a 350 personally.

[This message has been edited by dirtbuster (edited October 18, 2004).]

robhbk24
Member
posted October 18, 2004 03:10 PM
so the 350 has more torq than a 327.i am guessing on a short track i would need the torq more than the rpm. I basicly need an engine that will get up and go out of the turn and and have the ability to keep on pullin on the straightaway.and one that would be pretty stock and just need a little more gear to help if any.


Eljojo
Member
posted October 18, 2004 08:05 PM
Look at the whole thing-not just one part.
Heavy car with big tires on a wet track or a 2300lb car on a dry slick track running 8" tires? Sweeping turns with banking or stop and go? Have you got the $ to put a motor together that will spin over 8k? Will your rules allow the motor to breathe in and out that rapidly. JMO but I have always thoought that the only thing better than cubic inches is CUBIC DOLLARS!
Good luck whatever you decide on.


Ego Racing
Member
posted October 20, 2004 08:54 AM
If your track gets dry slicy quickly or by the time your class runs a 327 should be easier to drive as it will not overpower the tires as easy. In our Super LM's we have one with a 362 and one with a 311 and either one is as fast as the next it just takes two driveing styles, on tacky the 362 grunts it and the 311 has to stay wound up, on a dry slick the 362 has to be babied while the 311 hooks and flys.


iowatoolman
Member
posted October 20, 2004 03:18 PM
great reply ego that is what i have been trying to say all season bigger isn't better just more to wash LOL
quote:
Originally posted by Ego Racing:
If your track gets dry slicy quickly or by the time your class runs a 327 should be easier to drive as it will not overpower the tires as easy. In our Super LM's we have one with a 362 and one with a 311 and either one is as fast as the next it just takes two driveing styles, on tacky the 362 grunts it and the 311 has to stay wound up, on a dry slick the 362 has to be babied while the 311 hooks and flys.




rico 08
Member
posted October 20, 2004 06:58 PM
I guess i'm on the other side of the fence..the smallest motor ran around here is a 355,we had a guy with alot of money build a 327,he had dart iron eagles,roller cam etc..he just could not keep up...nowdays even a 355 is on the edge of being too little.


Ego Racing
Member
posted October 21, 2004 11:42 AM
We have taken our cars to a track that looks like a paperclip. 780ft straights and 200ft turns and the 311 dominates there. There rules allow 430ci motors with a 50lb weight penilaty. I have not figured why other than we gear it a little different than the other motors but that car and motor just LOVE that track. The very first time the guy drove the track was to qualify for a $2500 to win race and he took the pole.


badfastjr
Member
posted October 21, 2004 01:00 PM
307 chevy block .030 over bored and a Callies 3.25 stroke light weight 1.8 rod journal crank, 6 inch rods, Dart heads and 14:1 custom pistons. Runs on alcky and a 950 willys carb. Complete motor and machine work done for under $4000. Bought the heads used local. The crank and rods from Musle Motor Sports along with the intake. New carb, MSD mag, and pistons. Dyno was about 700HP with custom roller cam.