In the next 6 months or so I would like to get a set of heads for my 355 cc305 motor. I was wondering about the intake volume should I get 190 to 195's and let the blower do the work or can I afford to go a little larger intake volume with the blower. Would also like to get a blower specific gind eventually. Prob the Afr's ported by one of the popular porters here. Or is their Street cnc good enough to bolt on. I know I should atleast upgrade to stainless valves.

Thanks
Rob

 

Answers depend on your budget, goals, and the intended use for the car. Intake port size is less of a limitation on power output with a blower car, but flow counts every bit as much, if that makes any sense. I think the 190-195cc AFR's are an excellent chice for street use. That's why I use them. But for ultimate power output, the larger heads will be better.

Rich

 

Right now I run 11.80's with the stock heads with some cleanup work on intake and exhaust. Mostly lookin at the droping the compression a little, Also like the thicker deck. Do you have their street cnc or the comp cnc. If so are you happy with their work?? Also is there plenty of rom to open them up some if I wanted tp later? Thanks
Rob

 

Also budget would be from $1800 to $2400.

 

I also use the 190cc AFR heads, cam is the 224/236 on 114lsa and the displacement is 383. Compression ratio is 9:1

The AFR cnc porting looked good enough for me, the fact that it was even cylinder to cylinder was a good thing.

Streetablity is stock or better ... and that does make a difference in how much you like the car.

Hope this helps

LWM

 

The best results are from good hand porting, if you can get it. But the factory CNC isn't bad. Not any cheaper than a good hand porting job though.

Rich Krause

 

I'm going with the new tfs's out of the box for the current stock bottom-end and then have them ported to the max for the 383 buildup to come when I grenade it.

 

Did you get those heads yet? I honestly do not see a big power increase over stock if you keep them uported.

 

I also wondered abut the TFS heads but hundred dollars more gets you the afr's. Thats bare vs bare prices. No valves or springs or anything.

 

Guy who is helping me with engine buildup and what not does R&D work for tfs and he knows his stuff. He said they are great and since I won't even pretend I know more than him, I am going with them.

 

Just out of curiousity. Are these heads even out? I would base my decision not on what someone says but results. What kind of setup are you running?

 

He does R&D work for them so even if they aren't out, I'm sure he knows what they do out of the box and what their capabilities are. They will be ported and going on my 383 once the stock short-block decides to blow.

The 190's are out for sure and you can order them through summit.

 

I was not trying to say that he did not know what he was talking about. I was more or less wondering if there was an advantage over AFR's or LT4 heads.

 

if your budget will allow you to spend 2400 on heads then why dont you buy the afr 210s. thats what i bought for 2000 from combination ms. they flow 283cfm 2.08intake 1.60exhaust valves. i also bought the 224 236 114lsa comp cam. only problem with the afrs is that they always seem to be on back order.

 

No worries man I knew you weren't ragging on him or anything. I'd say they are a happy medium between stock lt4 heads and afr's. He said they have really good potential though so who knows what he'll do with them when I put 'em on the new motor.