420A headflow....

[RuBiCaNT5X]

Any of you 420A guys have head flow numbers with the stock manifold?

 

[Justin99RST]

don't know the exact numbers, but it flows well enough in stock form to put HRC's RS at 10.87 in the 1/4...

 

[Eclipse96Ryder]

ya the head on our cars is pretty sweet...doesnt need much work

 

[VOTBLINDUB]

seriously? i thought this was the basic type of head, i mean it's a nonturbo car, woulndt it be better on a turbo, logically? i'm just not sure ya know? I hear some parts are chrysler too, do you know what ones? I mean most of it is but still. is and most of the chrysler stuff is :thumbdown: I heard that if you polish the head of a nonturbo 420a it'll maybe give you 10-15 hp, which is not too too bad, but it'd run like 450 bucks tho. In a turbo car if you do the same it'll boost it a good 50-60 hp, is that true?

 

[Kirby]

The 420a is all Chrysler. There are NO Mitsu parts in that engine at all. The head was designed by Lotus in their racing program, and Chrysler adapted it to street use in this car. As said above Hahn ran a 10.87 on a stock head. If you port and polish it it will help, and will help even more if you're turbo. As for HP figures for head porting, you can't guess at horsepower for head work because there is no standerd port job. It all depends on what they acctually do to the air flow. In short your head is not restrictive enough to gain a large amount of power from port and polish on an NA car. It will help yes but I doubt you would see 15HP from it. Also you would have to port and polish the intake mani and throttle body to get the most out of it.

 

[Initial DSM]

Kirby, if you can, can you please show me where you found that information about Lotus designing the head? I know this guy who swears up and down that it is exactly the same as a Neon head and that Lotus did NOT design it. He owns a 2.4 Neon track car , and a Dodge spirit R/T , which its head shows clearly 'designed by Lotus' on it. But his arguement is that the only Chyrsler cars Lotus designed for was the turbo Spirit R/T and Turbo Dodge in the late 80's. So if you have proof of that information, I'd like to show it to him to shut him up for once.