355tpipickup

iTrader: (5)

http://www.shafiroff.com/chevy-power...t-block-sc.php. I found a guy local selling a new 406 made for boost its the stage 2 build on the website. My question is if I was to run my new 195afr 60cc 1095comp ported heads on this setup what's the best head gasket to use to get the highest compression I can? I'm thinking about this short block for my next build. Also what's the biggest cam I could run and still pass the sniffer test? What kind of power could it make with no boost? The block is a great deal....one I don't want to pass up if it will work for my needs.

zraffz

So you'd roughly be at 9.4:1 compression with a .040" gasket. If you can find a set of steel shims, you should be between 9.5-9.6:1 compression... depending on what you are trying to build, you'd defiantly be leaving some power on the table (almost 1 full points worth of compression and leaving you with less cams to pick from).

For a fun mid grade pump fuel motor it would work perfect (probably could be a torque monster very easily). For a max effort pump fuel motor, it's not the best choice.


My biggest factor to determine if I wanted that short block or not would be how drive able you want the car. For a 6 speed manual car being driven on the street a few times a week, it's a good choice. For an automatic with a big stall that will be driven on ocassion, it's not ideal.

355tpipickup

iTrader: (5)

It would be a summer weekend joy ride taking it to softball games , to the gym, dinner with the wife ect and once or twice to the track. Not driving it to work or spending lots of time in it. I'm trying to build a bad sounding truck that will hold its own with the sports cars in town ha-ha. Mid-low 12s and getting the 100mph 110mph sticker in the window would be perfect!!!! I have always told myself if/when I blow up my built 700r4 that I will change to a T-56 6spd. The low end power is always a blast on the streets. Not looking for an all out drag truck by any means. I just want a bullet proof block that will give me years of enjoyment..... I have put about 6k miles on this truck since I did the v8 swap back in 2004.

zraffz

These are generally accepted "rule of thumb" that don't fit everybody on here.

Most guys on here with mainly street motors will fall into the 9.00-10.50:1 compression range on 93 octane. These cars have a mild to agressive lope at idle and generally can support a cam that will spin to 6,500-6,700 RPM... which is about the extent of what most hydraulic lifters can see before fighting valve float.

Some will be upwards of 11.00-11.50:1 compression but they are pretty much max effort pump fuel cars that sacrifice a good part of their street manners (7,500 rpm shifts, 4,000 stall, etc). These are also the street cars with large solid tappet camshafts (high 230 low 240 duration or larger) that have a "radical" idle.


You can have too much cam for your compression ratio and end up with a lazy/lathargic motor through most of the power band. Alternatively, you can have that race car idle with a cam like Comp Cams ****** Thumpr line of cams at the trade off of some power.

Im not sure how familiar you are with driving a manual vehicle with a rather agressive cam (bucking/surging below certain RPMs and having to slip the clutch a lot to get moving). I can tell you these types of cars aren't fun to drive in stop and go traffic or around town... and some of us hate getting stuck on an incline with a car right up our ***!


Im speaking based off smaller displacement short blocks (I am not sure how cam duration vs compression in larger cubic inch motors works).

zraffz

I'm actually getting a little carried away. If you have a set of 195cc AFR heads, that motor is probably a perfect match. Those heads will probably only support 6,500 RPM tops on that large motor. Your compression might be a hair on the low side for a cam like that but I'd be willing to say that your combination spinning 6,000 RPMS could probably put a 4,500lb truck into the 12s.

355tpipickup

iTrader: (5)

Ok so anyone have an idea how this block with 60cc heads, thin head gasket for say a 9.6-1 comp, with AFR 195 comp ported heads, ported HSR, and a mother thumper or xfi280 cam would run in an auto(2800,stall) on the street and what kind of power it could make. Would this be a fun low end tire fryer that will also pull hard to 6k?

355tpipickup

iTrader: (5)

I have a custom XFI 224-230 560s lift 112 cam in my 356 with the same heads and intake right now and needing to get a tune before I can drink it. I just don't think the stock short block will hold up to the abuse for very long.... I found this 406 short block for sale local so I'm trying to diside if I should get it and have it to use on the next go around.

Orr89RocZ

iTrader: (20)

It will run fine with the 280. 292 is bit big for 195 head and that low comp. but can work and give you nasty idle sound

355tpipickup

iTrader: (5)

But would is pass emissions is the kicker ha-ha

Orr89RocZ

iTrader: (20)

Most likely no with any cam over 280 size