Recommendations for mopar 383 ss

Moparteacher · 12-03-2007, 06:07 PM

Hello all. After several years of on-again/off-again with my 69RR project it's on-again. I was up in the air as to whether it would be a stock or SS car. I've decided to go SS. The 69 383 combo for stock has too many hurdles with valve-to-piston clearance being the biggest issue.

I've spoken with several members in person over the last few years every Spring and Fall in Vegas, and all have been helpful. Thank You.

I have a few questions concerning pistons and appreciate any advice.

#1 Preference for piston manufacturer? I've already selected the C&A rod.
#2 Is the .990 pin legal for the 383? It is my understanding that many 440's run the .990 pin.
#3 Is it a requirement (legal) to lower the compression height to accommodate the increase in compression ratio with bore oversize, or can I run the stated compression height in the blueprint specs reguardless of bore size and the resulting compression ratio?
#4 Can I reduce the combustion chamber size the equivalent amount, or fewer cc's, of my valve notches? Example: Specs say cylinder head combustion size to be 79.5. Piston is flat top with 6cc notches, can the combustion chamber be reduced to 73.5cc's, and stay legal?

This vehicle, and myself, represent an educational institute. The ethics of legality are a high priority. Staying legal is a must, as I'm sure it is for all that contribute. Thanks for the advice. I'm looking forward to spending some time on the track in 08'.

Gary Weaver
College of Southern Nevada

12-03-2007, 06:07 PM	#1
Moparteacher Junior Member Join Date: Nov 2007 Location: Boise Posts: 49 Likes: 0 Liked 0 Times in 0 Posts	Recommendations for mopar 383 ss Hello all. After several years of on-again/off-again with my 69RR project it's on-again. I was up in the air as to whether it would be a stock or SS car. I've decided to go SS. The 69 383 combo for stock has too many hurdles with valve-to-piston clearance being the biggest issue. I've spoken with several members in person over the last few years every Spring and Fall in Vegas, and all have been helpful. Thank You. I have a few questions concerning pistons and appreciate any advice. #1 Preference for piston manufacturer? I've already selected the C&A rod. #2 Is the .990 pin legal for the 383? It is my understanding that many 440's run the .990 pin. #3 Is it a requirement (legal) to lower the compression height to accommodate the increase in compression ratio with bore oversize, or can I run the stated compression height in the blueprint specs reguardless of bore size and the resulting compression ratio? #4 Can I reduce the combustion chamber size the equivalent amount, or fewer cc's, of my valve notches? Example: Specs say cylinder head combustion size to be 79.5. Piston is flat top with 6cc notches, can the combustion chamber be reduced to 73.5cc's, and stay legal? This vehicle, and myself, represent an educational institute. The ethics of legality are a high priority. Staying legal is a must, as I'm sure it is for all that contribute. Thanks for the advice. I'm looking forward to spending some time on the track in 08'. Gary Weaver College of Southern Nevada