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10-27-2015 06:14 PM #1
Changing compression ona built motor
Hey all,,, I recently acquired a 383 stroker to go in my Hot rod and it is supposed to have 11.5:1 ratio compression,,,, from what I understand it's not a good idea to run pump gas with the compression that high on steel heads,,, it is a running motor and I don't want to tear it down unless I have to but I'm okay with doing that,,,
I'd like to lower the compression to 10:1 and run normal pump gas without octane booster.
So any input on how to build a 383 with the existing parts I have now and what would need to be changed is greatly appreciated,
Here's what I can tell you about the motor,,,, if you need more let me know and I'll do my best to get it.
Good ole 10/20 block,
Scat crank with I believe 3.75 stroke,
5.7 Scat rods,
Dart Iron Eagle 72 CC heads,
Roller tip 1.6 rocker arms,,, steel stamped
12-292 cam,,, 501 lift I think and 110 lobe separation,,,, need to look up more on this one.
Domed piston but I could not get the dome CC,
Holley 750 double pump vacuum secondary carb,
Not sure of the intake but it's definitely not a street intake,,, single plain high rise,,, probably Edelbrock,
Oaky that's all I can think of at the moment.
We managed to get a couple of other small things taken care of. One was blacking out the front of the core support. When the sun hit the front of the car just right that green paint on the core...
1968 Plymouth Valiant 1st Gen HEMI