A friend of mine (Tony Sheperd) had a budget 383 with home ported heads and a CC306 and he ran a 11.3x @ 122 N/A and on a 100 shot he ran a 10.8x @ 129. He drove his car everyday. It was his only car for a while.

Not too shabby!

 

It will take a lot more than the 306 to trap 120 MPH. I can't recall any specific examples but if I remember correctly people in the past were trapping around 113-115 with the 306.

Do a search and you will find in most cases that a 383 with a 306 will not trap much faster than a head/cam motor with a 306. I personally feel the 306 is far too small for any stroker. Get your heads flowed after the work is done, call the cam company and tell them your combo with flow numbers. They will give you the cam you need.

 

i can remember when Jordon Musser had his 383 with 306 cam and ported LT1 heads in his 94 Z28 M6 he did mid 11's@120 mph. but still yes i can see some 383 and 396 stroker NA with 306 cam cars are running high 11's@112-115 mph not sure if they had a good launch or they were at higher altitude, so it is realy confusing.

also there are some 350 and 355 LT1's that trapped even more than 120 mph in the 1/4 like Chris Bennight and Rob Guy and one guy with i guess a 96 TA or firebird but i can't remeber his name, this guy did low 11's @124 mph with a 355 LT1 but again that car had good ported 190cc AFR heads and of course the CC306. maybe it realy depends on how good the heads are and on the altitude. i'm my self at sea level.

 

How about a custom ground cam to match your heads?
Why get a one size fits all cam when you can have one custom ground for your needs?

I suggest the Xe if you must get an off the shelf

 

In the big picture rod length isn't as important in the life expactancy of a motor as is how the driver treats the motor.

Yes 6.0" rods might be less stressful on the cylinder walls but if you're driving the **** out of it, its not gonna really make any difference.

There are guys on this board with almost 100K miles on their strokers with 5.7" rods because they treat their motors well.

I went with 6.0" rods though.

 

so since some 350 LT1's with 306 cam and 383 LT1's with 306 cam have very close 1/4 times do you suggest that my friend just stick to his 350 LT1 and just put new piston rings in it with the heads/306 cam, Hooker LT's...etc?

 

i sent a check to NuTek motorsports for the following :

1- scat cast steel 3.75" stroker crank piece rear seal.

2- eagle (or maybe scat) H-beam 6" rods.

3- KB hypereutectic pistons flattop pistons.

4- rings and bearings.
5- balancing.
6- CC 306 small base circle cam.
7- a pair of BFGoodrich Comp T/A drag radials.

about the KB flattop pistons shall i change them to SRP JE forged flattop pistons? my friend will occasionally use a 150hp shot.

BTW, the 383 kit with balancing costed me $1075
i like NuTek work .

 

Definately get the SRP pistons if you are using nitrous and put a little extra gap in the rings.

Nu-tek is a great company.

If possible you might want to consider having them build the entire motor.

Otherwise they are very knowledgable people and you should ask Nick or one of his tech guys about cam selection as well.

 

I decided to wait until I get flow numbers from my head porter. then order a custom grind from lunati. Definitely get your heads & intake ported. A stroker needs to breath to make serious power. Also a bigger motor = bigger cam, I too think that a cc306 is a little small for a 383. I have been eyeing a 232/242 .540/.566 112 lsa on my Project 383. I like to play with Desktop Dyno and see what custom grinds will do to a power curve. Nick at Nu-tek is great to work with i ordered a canton oil pan from them, and before it arrived i got a call explaining that there might be a problem with the oil level sensor hitting one of the trap doors. Sure enough there was, but UPS came and picked it up to ship it back to canton to fix. That is outstanding customer service.

 

SnkEatr, he has race ported LT1 heads with high port velocity and they are ported by a pro :

.200 142 cfm
.300 189 cfm
.400 231 cfm
.500 263 cfm
.600 267 cfm
.650 270 cfm

also the intakemanifold is ported.
i will think about the custom cam.

 

How is the 306 smaller than the cam you mentioned when the 306 is 230/244 .544/.576?

 

You got me i should have said i had been eyeing.....but it does have a little less intake duration. 2 degrees or so. From what i have gathered lately the XE 236/242 set-up looks good as well. Hell the whole cam selection process has been going on for a while now (at least for me) For us street/strip combo drivers we want as much power as possible and good driveability. That is not something you can find out by just by punching numbers into DD. I mean will this cam make 400HP with these flow numbers, and still pass emissions or pull enough vacuum, and work well with N2O. The whole cam thing scares the crap out of me. I am 11K into this project and still dont know what cam i want. I am close but as i said i am going to leave it up to my head porter. When he is done with the heads and they are flowed we will pick a custom grind based on what i want from the car. 11's at the track, and an idle that will still have power brakes. Emissions are not a concern here, thankfully they lifted them a couple of years ago.

 

Have you guys thought of using a GTP-6 cam???

 

Nice ride silver. thats the times I am shooting for. same build going with a custom ground cam. 236/246 112lsa 555/578 I also had the bottom end splayed so it should handle a 200 shot. lets see what she runs in march

 

$11,000?
spend an extra $!00 for custom ground to match the heads
call combo motor sports
they rock