As some of you know i'm looking at head work etc....
Just wanted to know if a S1 head will bolt straight on in place of a S2 head i know it will on the block it was the inlet manifold i wasnt sure about as the S1 is different to the S2, will they match up? I also noticed the exhaust ports are round on a S1 head and squarer on a S2.
All the vavles etc will be replaced so it's is just a bare head comparison really.

Thanks!

 

well ive just got a 2.1zvh from a s2 and ripped off the s2 inlet and bolted a s1 inlet straight on so yes ive heard tho dont hold me to it that the early cvh heads are better for tuning and also says this in the burton cataloge whos doing you head work

 

They are pretty much the same dimesionally (as in replacing one for another). I tend to opt for the EFI heads and just weld up the injector areas, these can be removed later if needed for EFI, Coz Mgmt etc where you dont want to use the spacer plate
Not having much luck with these valves

 

Oh thats good to here, thought i'd just check! Hopefully NMS are doing my headwork, i've just got to give them a call and get some prices and a time frame.

Cheers for your help mate!

 

Std series 1 valves are sodium filled so better that S2 and most replacement valves

 

25 years ago yes, but now they will be brittle and prone to breaking from what I have read Sodium Valves should never be reused.
But as I said just a bare head comparison really.

 

No prob... i'm very rusty when it comes to the cvh engine as i've not had one for 10+yrs..

You can buy new sodium valves for big valve heads, but i heard they werent cheap

 

Yeah i imagine they are not! lol

 

ive got a few mates that went to nms for some work and the are brilliant so you should get some very good results at the end.

 

ive got a jamsport head and a nms head sitting here in front of me now and there nothing in bar the price.