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Jul 21st, 2025 | | | | Joined: Dec 2001 Posts: 215 Shop Shark | | Shop Shark Joined: Dec 2001 Posts: 215 | Hi all,
I am building a new moter for my 69 4x4
1972 4 bolt main block, forged 383 crank,
9.5 to 1 pistons(which ones should I use?)
Dart cast iron performnce heads.
What cam would you all recomend for most mid range power & tourq with out sacrificing top end power?
thanks Luke | | | | | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | Luke as far as pistons for your 383 I would use a hypereutectic piston with a pin height for the 5.7” 350 rod or an aftermarket 6.0” rod. Stay away from the shorter 400 rod.
The hypereutectic piston is almost as strong as a forged but can be fit a lot titer so they don’t rattle during warm-up like a forging will. They also seem to build a little more power because they reflect more of the heat back in to the chamber.
As for your cam I prefer Comp Cam’s give there tech line a call armed with this info.
1 How you want the vehicle to perform.
2 vehicle weight.
3 Gear ratio and tire size.
4 RPM you plan to run
And 5 if you can obtain a flow chart for them heads that would be great. | | | | | Joined: Oct 2006 Posts: 843 Shop Shark | | Shop Shark Joined: Oct 2006 Posts: 843 | When I needed to rebuild the 350 in a C20 Van.I used a ISKY "272"cam.It had a power range from idle all the way up to freeway speed.The gas milege was no worse than stock.Later when I towed a car trailer,it didn't care, just pulled it too.Oh,also had a Perfomer manifold.I've heard the Comp Cam 268 is good too. | | |
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