|01-23-2007 07:53 AM|
|Dirt Car 18||
In the touring series' of professional dirt Late Model they match the engine size to the size of the track and the gearing required. That application uses an aftermarket crank with a 3.5" stroke making it 380 CID. The 380 has been the standard on 1/4-3/8 mile tracks were a 6.40 or lower gear is used. A big engine (420, 434, 447) is too hard to hook up on short tracks with low gears. Engine development in the last few years has produced a very manageable power delivery and as a result the 393 (3.625" stroke) is replacing many 380s and has set many track records in 2005 & 2006 on short tracks. They still regularly turn the 393 8600 rpm and 8800 when they have too, same as the 380. The bigger 1/2 mile tracks, where they take a lot of gear out of it, will benefit from a bigger engine like a 434.
But, for a street application I see no advantage for the smaller motor. I would build a 434 or a 447 if I was buying new parts.
|01-23-2007 07:36 AM|
I had a 358 (3.295 stroke 4.155 bore) in a 1969 Firebird. It did pretty good on nitrous, but was not the most impressive on motor alone. It dynoed at 608 hp at 7900 RPM but only had around 460 ft lbs, cant remember for sure what RPM that was at . The car weighed 3150 with the driver. 1/8th mile, it ran a best of 7.12 on motor and 6.29 on a 100 shot. That was with a glide, 4.88 gear, 28" tall tire and a 5000 stall. I think it would have run better and been easier on parts (valve train at least) to just build a 406.
|01-23-2007 07:19 AM|
|DoubleVision||We used one years ago in a full sized mud racing truck, bad idea, it lacked enough low end torque for a good launch, however when we threw it in a 73 Nova drag car it was a different ball game. We were impressed with what it would do drag strip wise, I wanted to stick with it, but instead my bro in law decided on straight 400, we liked it better afterwards.|
|01-23-2007 07:04 AM|
|runn141||best circle track engine i think|
|01-23-2007 06:49 AM|
We have done some 377's for circle track guys in our area. They have all had good things to say. Use decent parts, need to spin pretty hard!
Ottawa Engine and Performance
|01-23-2007 03:26 AM|
Anybody running a 377 SBC?????
Anybody running a 377 SBC now or in the past?
What do you think of the combination?
Haven't seen one in 7 years.
Or even the 352? Ever seen one?