Javelin
UltimaDork
4/4/12 1:43 p.m.
Cubic inches isn't everything (and for the record, Mopar has 528ci HEMI's, Chevy has 572ci MKIV's, and Ford has 521ci big-blocks without going to raised cams or anything, just using the factory blocks), it's about airflow. Even the craziest racing-spec LSx head can't flow anywhere near most of the bolt-on BB heads, let alone something crazy like a Pontiac Ram Air round port. The biggest air pump still makes the most power.
LSx's rock because they make near BB airflow (and power) in a SBF sized, lightweight, package. And I still want one. Or maybe two. 
Javelin wrote:
Cubic inches isn't everything (and for the record, Mopar has 528ci HEMI's, Chevy has 572ci MKIV's, and Ford has 521ci big-blocks without going to raised cams or anything, just using the factory blocks), it's about airflow. Even the craziest racing-spec LSx head can't flow anywhere near most of the bolt-on BB heads, let alone something crazy like a Pontiac Ram Air round port. The biggest air pump still makes the most power.
LSx's rock because they make near BB airflow (and power) in a SBF sized, lightweight, package. And I still want one. Or maybe two.
That may have been true with the original LS1, but it is no longer true today. Look here: http://www.vetteweb.com/tech/vemp_0908_trick_flow_specialties_ls_series_cylinder_heads/viewall.html 305cfm @ .600 lift. Compare that to this chart: http://www.airflowresearch.com/westech_figures.php and it's mid pack for BIG BLOCK heads. Looking here: http://www.hotrod.com/techarticles/engine/hrdp_1012_ultimate_chevrolet_ls_cylinder_head_test/viewall.html and there are several bolt on heads taht flow more than the best big lock head.
Just sayin', the LSX ain't behind anymore.
Javelin
UltimaDork
4/4/12 3:01 p.m.
Holy &*^^$# those square-port LS3/7 heads flow a lot! 
That's seriously impressive.
Yep. The LS1 was ground breaking, the LS3/7/whatever else they have now is earth shattering. They're big block power, big block flow, big block displacement from a small block package.
Oldsmobile never made a big block.
Javelin
UltimaDork
4/4/12 4:24 p.m.
Appleseed wrote:
Oldsmobile never made a big block.
Semantics. Neither did Pontiac, Buick, or AMC. They're all technically "mid-blocks" but it's very common to refer to them (less the AMC) as "big-blocks" to differentiate between the smaller corporate GM motors also used by the BOP.
Trans_Maro wrote:
Quite possibly the biggest auto engine rivalry ever:
vs.
The Hemi, cuz it's not GM....and it's a Hemi.
DrBoost wrote:
Trans_Maro wrote:
Quite possibly the biggest auto engine rivalry ever:
vs.
The Hemi, cuz it's not GM....and it's a Hemi.
My favorite vintage big block....
I wonder what Ford tunnel port heads flow
oldeskewltoy wrote:
I wonder what Ford tunnel port heads flow
Man, look at that. That is a gooood looking motor. Those headers look really cool for some reason.
Javelin
UltimaDork
4/4/12 6:46 p.m.
oldeskewltoy wrote:
I wonder what Ford tunnel port heads flow
Lots of rumor on those, but the best I could find was from the NHRA for classification purposes:
360-365 @ .800"
Imagine modern valves and porting on those suckers??!?!
tuna55
UltraDork
4/4/12 7:11 p.m.
Javelin wrote:
oldeskewltoy wrote:
I wonder what Ford tunnel port heads flow
Lots of rumor on those, but the best I could find was from the NHRA for classification purposes:
360-365 @ .800"
Imagine modern valves and porting on those suckers??!?!
I think that IS with modern valves and porting. I doubt the stock cam got it to 0.800", but I could be wrong.
Javelin
UltimaDork
4/4/12 8:26 p.m.
NHRA allowed cams can, hence the source. They call it a "tunnel port" for a reason man...
