can any one please help me out and tell me the difference between the ''NEW'' and old style racetronix 37lb hr injectors. cause im getting ready to order them for my lt1 383 but i wanna know what ones will be better for me. here are the links to the two injectors any info will be greatly appreciated. http://www.racetronix.com/621037.html
http://www.racetronix.com/01D114x.html

 

The 621037 flows a minute bit more but has a spilt pattern.
The INJL37 has a 3-prong cone spray pattern.
The INJL37's spray pattern would be better for your application.

 

but why exactly would that one be better? does it just atomize the fuel better cause it has the 3 prongs rather than the 2? and why doesnt it flow as much as the other one? thank alot for your info

 

Atomization and spray pattern are two different things.
The two-prong pattern is better for heads with 2 intake valves.
In this case the cone spray pattern is better for your single valve head.