New cam upgrade with Big Block

[4cyl h2]

have a 1325 10.5 maybe 11 to 1 max with head cut 1150 with CM g3s stock valve 28-23 star ported head 38mm rs flatslides titanieum retainers vs1100s springs and bronze hi lift guides im wondering the effect on performance switching to CM g21s
have a g21 380 lift short duration exhaust cam should i use a g21 intake also or is there a better option
and what change can i expect any ideas???

 

[Guest]

Is this a street bike?

 

[4cyl h2]

Mostly high perf street limited miles limited strip

 

[4cyl h2]

jay can you help here or have an idea??

 

[Guest]

On those big street motors, we like to limit the cams to .370s. Any more and you are wearing out the valve springs too quickly. Also you have the small valves in it.
Years ago we did a 1260 package for a customer, with .370s and our springs. That guy rode that bike from Calif to Louisiana and back.
http://gszone.biz/cams.html

 

[4cyl h2]

Which 370 cams. 190 or 212 grind I can hold out for.another set just thought 380 b close enough. But it's only 243 or so duration

 

[Guest]

Your motor is so big that I would suggest the 212 to keep cranking pressure down. The 190 would give better bottom end, but you will already have that with the displacement.

 

[4cyl h2]

Jay what kind of compression would be a ball park to shoot for when I degree the cams