|
Post by dirtmod0 on Jan 13, 2015 22:06:34 GMT -6
I'm curious which head would be better to run. The vortec or dart? Reason why. The class we run we are limited to 10.1 compression and have to run stock two barrel intake. Also we are limited to a stick two barrel holly. Now you can port and polish as well. We can run any cast iron head. Just using the dart as one example. The dart comes 200cc and Iv hear the vortec ported is around 190cc give or take. Iv also been told you do not want any bigger then the 200cc runner. Iv heard both on this question. But I hear of a lot of guys going to the vortec or the dart. We run solid lift with stock size valve springs I run Chevy. Any feed back would be great thank you.
|
|
|
Post by flipflopoo1oo on Jan 14, 2015 7:50:01 GMT -6
Cubic inches would help as to you vacuum pump size! The intake size, cam, valve size, rocker ratio, header tube limits and stroke would also come into question as well as pounds of the car and RPMs.desired! Just off hand DART! I would have to say Dart with out any good reason not to in most cases but we have managed to do quite well with most any heads up to a point of need! Give us a little more info please!!!
|
|
|
Post by dirtmod0 on Jan 14, 2015 19:47:41 GMT -6
No more then 360 ci. 1.5 rocker cam no restrictions on lift. Not sure on intake what ever a stock gm 2barel is. This year we are gonna use the marine vortec intake. We run stock 3.48 stroke and no restrictions in headers besides no try y. And car weighs 2250 it's a modified. We have a 7000 rpm chip rule.
|
|
|
Post by flipflopoo1oo on Jan 15, 2015 11:08:54 GMT -6
You will not see much difference at 7,000 but the Dart would not need a polish job! Valve size and cam choice with 1.5 rockers would be the thing as flow starts at timing with different size valves and ratios to cam specs! I try to keep vacuum and flow in mind rather than slower volume! You will have to play a bit with valve timing at the degree and lash to find more torque and horses! Header tube size can be tuned a bit with turn downs to add restriction back! A stainless valley shield and oil restrictors with vent tubes will help your intake stay cool! If your money is well spent on getting your temp down it pays off! Doing away with your power valve and jetting up to the needs of ign. timing can find even more! Un lock your dist. if so and do some searches on my post if you've not been keeping up!!! There are many options in getting more flow with out larger volume! What fuel will you be running?
|
|
|
Post by dirtmod0 on Jan 16, 2015 10:38:31 GMT -6
We have to run pump gas. Beyea headers told me they have a specific step down header that is designed for two barrel 10.1 motors. Yea I figured out a while ago it's mostly in the cam. Thanks for your help.
|
|
|
Post by flipflopoo1oo on Jan 16, 2015 11:52:34 GMT -6
Are the 1.5 mandatory? If not there is an edge with the correct length push rods and I don't mean with a push rod checker! Even the hydraulic lifters adjusted to the top or bottom can change geometry a bit at .020 or .050 to help out! Love pump gas engines as more of a challenge to out perform others! Compression so low as to have to take 93 out and put 87 in to make it perform! Burning twice the amount to get it done on the stock stroke by letting the timing start sooner and the blast build more compression than having to make it to start with! Any old trick I could find to make horses or just not throw them away!!!
|
|