4th Gen BBC Project by ulakovic22

5 minute(s) of a 54 minute read

RHS 320cc heads touched up by Lloyd Elliot, they flow a little over 400 cfm on a 4.310 bore, mine is a 4.56 bore so they might flow a little more.....pics are as cast, don't have any after the port work. Manley valves 2.25/1.88, PAC springs, BRE lightweight steel retainers, 10* locks.

Seimens Deka 79lb/hr injectors, I'm pretty sure that they should work, if not then I can always bump up the fuel pressure to get the needed flow. I'm only expecting around 825 fwhp so I think the stock lines and walbro should be fine until I start spraying.

Finally the brains of the operation, and a big thanks go to Brady for hooking me up with BS3/DAI. Once my Autometer gauges come in I'll post those up too.

All in all I think this will be a pretty cool project. When I get new batteries in the camera I'll get pics of the other stuff like TB, Victor Jr 454R manifold, Meziere Elec. w/p, etc.

Here is my post on CamaroZ28 when I first got them and had the work done. I haven't measured them, taken pics etc. since I got them back. Just been sitting in the boxes at the shop.

Quote:

Finally was able to drop the intake and heads off at Lloyds place yesterday and he was nice enough to take a break and flow the heads right there in front of me. It was really cool seeing how it all worked. Here are the "before" numbers and I'll update with the "after" numbers once I get them back in a couple of weeks.

Flowed @ 28" on a 4.310 bore fixture with 2.25/1.88 Manley Severe Duty Valves

.100 80/ ?

.200 142/106

.300 203/145

.400 259/184

.500 310/218

.600 353/241

.700 380/259

.800 388/269

For comparisons sake here are the advertised numbers from the RHS website.

.100 75/62

.200 166/110

.300 246/160

.400 309/195

.500 340/229

.600 360/248

.700 375/265

The peak numbers are pretty close, but you can see the low lift numbers are a little off. RHS supplied no information on how the test was performed other than @ 28", so I don't know how much of an apples to apples comparison it is in regards to bore fixture size, radius inlet, exhaust pipe, etc. 

More pics:

Here is the flow sheet, end runner on a 4.310 bore fixture and yes they are the 320cc version:

Headers are Hooker 2455's. They were 150 a set and I have cut the #7 primary so I can loop it and then go straight down to clear the firewall. I will have to bend them to get more clearance around the k-member, but they are a nice alternative I'm willing to work with in the beginning rather than buying a $1,200 set of headers. BTW they are 2" primaries, but I'm thinking on my next set I'll get 2 1/4".

The idea was to make the car appear stock so basically the car is stock. Uses stock hood, stock airbox, it has a T56, but it will be built later on after I find out what I'm looking at. Basically along with everything else I don't want to over build and get a Viper tranny for $2,500 to handle some pretty small numbers that a $1,500 or so tranny would handle just fine. I do have the McLeod Steel Street Twin already so I'm good there. 

Rear end is a little different, I would rather have confidence that I can launch hard so I'm getting a Midwest 9", I just have to decide what width I want. I would like to go 3" shortened with 15x10 with 5" backspace, I think that would be awesome, but I'm not sure if I want to do that or get a stock width rear and run 15x10 with 8" backspace so I can still run the stock WS6 wheels when I'm not racing so I can have once again that stock appearance and then just slap on the drag wheels when I go to the track.

I like the second option because it fits the theme, but the look of the first option is soooooooo nice.