ralliartjapracr

iTrader: (1)

I want to know if an Evo 8 head fit on top of a Ralliart Block?

AdamRA

iTrader: (2)

Do not post the same thing twice in a row, it's not worth doing thats the bottom line.

MitsuRalliArt

The reply in your other thread by me should solve the issue.

captain150

Ummm, NO!
DOHC VS SOHC is one big thing. I am 95% sure the bolt holes are in different places. I am quite sure the coolant and oil passages are in different places.

MitsuRalliArt

DOHC is great an all, but ricers seriously over rate it. I've seen freakin push-rod V8's on pump gas running 130 hp/L. A pushrod engine is like .5 OHC. Although the cam isn't actually overhead, it's between the cylinder banks. I'd take a good cam change over a DOHC setup any day.

captain150

The biggest 2 reasons why pushrod engines are limited is
1. Cannot rev as high, all those pushrods and rocker arms do not like to rev at 7000rpm.
2. Cannot have more than 2 valves per cylinder.
I'm sure 4 valves per cylinder HAS been done with pushrods, but it would be expensive to make work and make work reliably.
OHV (pushrod) engines are usually known to be torque monsters. However for horsepower, a twin DOHC V8 would be a better investment since they can mechanically rev higher and breathe easier. For dragging, an old American torque monster is the best. You want all your power and torque happening low for dragging, something that OHV V8s are known for as well.
BTW OHV/pushrod isn't related to SOHC at all. Sure they both have 2 valves per cylinder (except a few SOHC like the 2.4L mivec and the SOHC Neon engine).
But they behave differently.

reimundo

iTrader: (1)

if you want to find out pull the head out ,but 4g69 head is really good and your going to lose the mivec if you put the 4g63 head in.