I know their deck thickness is less than what most other head manufactures use, anybody hear of any problems. I am building a 540-598 13.5 to1, with up to a 400 shot.

Well I can't say I have ever heard of anyone shooting that kinda shot on Toplines, but as you probably know with a hit like that your tune is gonna be far more important then anything else and leave you very little room for error. Hope you are going with some Helfire or other steel nitrous rings. You gonna run that through a single stage fogger?

Hey, I'm glad someone posted about that, I have the Pro Topline 320cc Iron Thunder heads on my 505, I was thinking on maybe 150-200 shot down the road, will that be safe.

I got an email from Pro Action today and they said their deck is 3/4 400 shot no problem.

I am aware of the tune issues, I am familiar with nitrous. This will be a fuel injected motor (probably 2x 1000 cfm throttle bodies) NOS makes them with nitrous jets in the throttle body desinged to handle up to 200 each on a dry shot. I am not sure I like the dry systems, make go with a Fogger. I will end up running two systems one small (1st gear clutch car) and then the other in 2nd. I will not stack the systems I will run them seperate. When one turns on the other turns off, easier to tune that way. This will be a 540-555 in. motor.

Sounds like one mean setup! Best of luck.