mshred
The Green Manalishi
- Joined
- May 2, 2008
- Messages
- 3,257
- Reaction score
- 135
hey guys, originally posted this on moparts with little response, and knowing there are quite a few head gurus on here, im interested to hear your opinions
first off i dont know much about head technology so please bear with me...i dont NEED new heads but id like to try to immerse myself in the options available for me to maybe pick up some used heads on the cheap and learn how to port while also making more power...
I have a mild 340 .30 over that im hoping as it sits right now will run high 12's/low13's...it currently has x heads on it, and i would like to throw a 150 shot of NOS at it...the x heads are unported, intake is not gasket matched, only thing new is valvesprings to keep up with the cam thats in it (comp 280H cam- single pattern 480 lift, 280 duration)...I was thinking of going to some 308 heads in the future since they have the same intake port but better flowing exhaust port than my x heads (which i think would help with the nitrous) or so i have heard...Have also thought about going with magnums as well...Are either of these heads worth any et gain over the x heads i have on it right now? I know that factory magnum heads are prone to cracking, but are 308 heads the same way? if i was to go magnum, i know i would need magnum valvetrain and intake- would i be able to reuse stock magnum valvetrain stuff with the cam i have, or would i have to upgrade? i plan to wind my motor to a max of 6500 (for now) and the car is a 5 speed...I also have 2 sets of J heads sitting at home and have heard recently about alot of praise for them in ported form- do you guys think im better off with these instead? would i be able to reusethe valvesprings from my x heads with the J or 308 heads? like i said, id like to do this really cheap (as in getting lucky from weekly u-pull searches, finding a decent set of heads, cleaning em up and mild port, and stick em on)...thinking it could be a good learning experience, but if this direction is just a waste of time and not much worth it over x heads at all, then ill just stay away...also, if there are any sites with tech info or stock specs on magnum and 308 heads that anyone could share i would really appreciate that as well...just a little about the rest of my combo
340 .30 over 10.5:1 cr, airgap intake, heddman headers, 3 inch exhaust, carb in the 750-850 range, 3.91 gear, stock suspension with the usual traction tricks
Please enlighten me! open to all opinions on this topic!
thanks!
Matthew
first off i dont know much about head technology so please bear with me...i dont NEED new heads but id like to try to immerse myself in the options available for me to maybe pick up some used heads on the cheap and learn how to port while also making more power...
I have a mild 340 .30 over that im hoping as it sits right now will run high 12's/low13's...it currently has x heads on it, and i would like to throw a 150 shot of NOS at it...the x heads are unported, intake is not gasket matched, only thing new is valvesprings to keep up with the cam thats in it (comp 280H cam- single pattern 480 lift, 280 duration)...I was thinking of going to some 308 heads in the future since they have the same intake port but better flowing exhaust port than my x heads (which i think would help with the nitrous) or so i have heard...Have also thought about going with magnums as well...Are either of these heads worth any et gain over the x heads i have on it right now? I know that factory magnum heads are prone to cracking, but are 308 heads the same way? if i was to go magnum, i know i would need magnum valvetrain and intake- would i be able to reuse stock magnum valvetrain stuff with the cam i have, or would i have to upgrade? i plan to wind my motor to a max of 6500 (for now) and the car is a 5 speed...I also have 2 sets of J heads sitting at home and have heard recently about alot of praise for them in ported form- do you guys think im better off with these instead? would i be able to reusethe valvesprings from my x heads with the J or 308 heads? like i said, id like to do this really cheap (as in getting lucky from weekly u-pull searches, finding a decent set of heads, cleaning em up and mild port, and stick em on)...thinking it could be a good learning experience, but if this direction is just a waste of time and not much worth it over x heads at all, then ill just stay away...also, if there are any sites with tech info or stock specs on magnum and 308 heads that anyone could share i would really appreciate that as well...just a little about the rest of my combo
340 .30 over 10.5:1 cr, airgap intake, heddman headers, 3 inch exhaust, carb in the 750-850 range, 3.91 gear, stock suspension with the usual traction tricks
Please enlighten me! open to all opinions on this topic!
![grin.gif](http://board.moparts.org/ubbthreads/images/graemlins/grin.gif)
thanks!
Matthew