TorRed
Well-Known Member
- Local time
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- Joined
- Dec 12, 2023
- Messages
- 230
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- Location
- The Villages, Florida
Hi All,
I'm about to get serious about restoring my 70 Roadrunner and have a question about what compression ratio I should shoot for. What I have so far: 440source CNC'd Stealth heads, Doug's 1 3/4" headers, new six pack setup either vacuum or full mechanical linkage carbs (or Mopar M1 dual plane or Holley Street Dominator intakes), Lunati Hydraulic Roller Cam (Advertised Duration (Int/Exh): 282/290 ;Duration @ .050 (Int/Exh): 231/239 ;Gross Valve Lift (Int/Exh): .535/.550 ;LSA/ICL: 110/106 ;Valve Lash (Int/Exh): Hyd/Hyd ;RPM Range: 2200-6200). 3000 stall FTI torque converter, Gear Vendors Overdrive, 8 3/4 with 4.10 gears. I'm also sticking with a 2.5" exhaust for clearance and sound.
When I order my 432 stroker kit the highest compression ratio listed for my 80cc heads is 9.8, if I shave the heads to 75cc it jumps to 10.3 which I think is closer to what I want. Opinions? Worth the cost of shaving the heads (haven't priced it yet)? Is 9.8 to 1 fine with everything else I'm running?
Thanks in advance for your input,
Jim
I'm about to get serious about restoring my 70 Roadrunner and have a question about what compression ratio I should shoot for. What I have so far: 440source CNC'd Stealth heads, Doug's 1 3/4" headers, new six pack setup either vacuum or full mechanical linkage carbs (or Mopar M1 dual plane or Holley Street Dominator intakes), Lunati Hydraulic Roller Cam (Advertised Duration (Int/Exh): 282/290 ;Duration @ .050 (Int/Exh): 231/239 ;Gross Valve Lift (Int/Exh): .535/.550 ;LSA/ICL: 110/106 ;Valve Lash (Int/Exh): Hyd/Hyd ;RPM Range: 2200-6200). 3000 stall FTI torque converter, Gear Vendors Overdrive, 8 3/4 with 4.10 gears. I'm also sticking with a 2.5" exhaust for clearance and sound.
When I order my 432 stroker kit the highest compression ratio listed for my 80cc heads is 9.8, if I shave the heads to 75cc it jumps to 10.3 which I think is closer to what I want. Opinions? Worth the cost of shaving the heads (haven't priced it yet)? Is 9.8 to 1 fine with everything else I'm running?
Thanks in advance for your input,
Jim