Im in the process of buying and selecting parts for a blower motor. I plan on using a shortblock from golen engines built as a blower motor. http://www.golenengineservice.com/ht...rt_blocks.html The compression should be about 9.25 to 1 and it will be a 383.
The following no's are for my existing heads
Lift intake exhaust
.100 60 55
.200 125 111
.300 187 155
.400 230 187
.500 263 207
.550 258 211
.600 253 215

The blower kit is a vortech s trim kit that I already have in my garage. I hope to run 6psi but would like to eventually get the car up to 12-14psi.

Now to my question. What cam to run? It needs to be able to pass emissions.

The cam that Golen shows on their web page is a comp. cam with the following spec. 214-224 dur, 531-568 lift and 115 lobe. This is with 1.5 rockers.
I called comp cams and tried to get a part no. for that cam, but they said it was a propritory grind, and he recommended the following for my motor. 07000-8-LT1-3016-3037-HR114+2 He said this is a 230-236 dur. 576-571 lift and 114+2 lobe sep. Also, he said this was with the 1.6 rockers I now have. Power range is supposed to be 1800-6500 rpms.
He felt that this cam would pass emissions with tuning. I thought it sounded like a lot of duration to pass emissions. But I really dont know.
I would like some opinions on cam selection and keep in mind this is a street car that has to pass emissions. It is not a daily driver, and I do go to the track 20-30 times a year.
Also, I have 3.73 gears and a 3,000 stall converter.

 

Sounds interesting. But it may not really make a significant difference. No matter what you choose your not going to have any decent traction unless you already have a very sensitive right foot. Your motor will probably put out 550 rwhp and with more boost plus/minus 600rwhp. And if you twist above 6 grand even more. Now if you can effectively apply that power to the ground call me and teach me how. Good Luck in your selection.

 

I have been using ET Streets (bias ply) 26x11.50x15. but the problem is I am on my 3rd D44 rear end. I really want to go to a 9in solid axle in time. Neverlift makes a 12 bolt conversion kit but not a 9in. I fully expect this to be my next big expense after getting the motor together.

 

You can be like some of the others with large power and concentrate on the last 1000' of the track. Basically, if I get a 1.6-1.7x sec 60', I feel that I have done a good job (you should see what a 2.7-3.3 sec 60' looks like). My best 60' ever with this car wa a 1.52 when I was running very high 11s with spray. It has been all slower since.

You walk it out of the hole, then gradually pour on the power. I figure I have given up ~0.4-0.5 sec on the 60', but I still have the rest of the track to push it.

No matter what RPM, BFG DRs or MT ET drags, my 60' always sucks.

As for the cam selection and losing low-end / passing emissions, I have to pass emissions and tune accordingly. I run a seperate, dedicated program just for emissions once a year. My cam is a Comp Cam solid roller at 248°/254°, ~670"+ lift on both intake and exhaust, and ground on 112LSA.

The extra cubes will help to tame some of the larger cams.

Aaron

 

Rich
As I look at your heads flow numbers. Your exhaust flow is pretty high as compared to the intake numbers, over 80% as you get past .500 lift.

As for Comps recomendation. I think he is on the right track in one respect but his numbers are a little big @.050. I know he thinks by putting it on a 114 L/S with only 2 degrees advance ground into the I/C (112) it will tame the cam a bit, but there is still no way it will pass emmissions and it will be lazy to build RPM on such a long L/S with so little advance ground into it.

I think you need a camshaft with a small amount of split about, 4-6 degrees IMO. I normally run a little more on S/C engines, but your heads are really good for a S/C engine. Look at this lobe chart from Reed Cams. Reed is pretty much a custom grinder so you would have to tell them what you want or ask their opinion on lobe selection and centerlines.

http://www.reedcams.com/hyd_roller_profiles.htm#1

I personally like the TM 276 for the intake and the TM280 for the exhaust, set up like this using your current 1.6 rockers.
Intake / EX
Dur 276 / 280
Dur@.050 224 / 228
Lift(1.6) 544 / 544
L/C 108 / 116
L/S 112

Will

 

I really doubt that the Comp guys suggestion that a 230/236 cam will pass emissions. Especially if your state has a IM240 test standard. You will stand a much better chance at passing with the smaller Golen "proprietary" grind. Which you can have Comp Grind for you with these numbers: 07000-8-LT1-3190-3192 HR115

Those are the lobe numbers direct from Comps lobe catalog. Mind you that the lift is reflected with the use of 1.5 rocker arms and if you use 1.6 rockers the lift would be increased to: .565/.605

That cam actually would work fairly well. I used a custom roller for years in my S trim 396 engine. It was a 216/220 cam on a 114 with those numbers it made over 550 on a nice cool New Mexico day. It would easily pass emissions with CATs. I made that power with my custom made cogged drive. At that time no one was making a 8 rib kit. In New Mexico where I was living it was 6500 feet above sea level. In Albuquerque it is 5000 feet where I took the car down the strip at 11.20 for its best time.

Another thing you need to worry about is in order to make 10+ PSI of boost you have to have a 8 rib conversion to your blower drive. Contact Greg @ Blower Works and he can get you set up. We are running T trims with his 8 rib kits and we can just hit 12 PSI and 620 to the wheels which I and Greg feel is about the limit for the T Trim. This is figuring on 100 Hp drive train loss, and 100 Hp to drive the blower at that level making 820 at the crank. The T Trim is rated to 800 Hp so we both feel that 620 to 650 is maximum wheel hp for this blower. Having said that your S trim will most likely make less power. Especially if you attempt to over drive the blower beyond its efficiency curve.

 

Thanks to everyone above for your advise. I have been out of town, but I want to study each one carefully and get back to you with future questions. Again thanks for your help.