Garage-Built 347 makes 412 rwhp with 228/230 Cam and stock 243 Heads
03-19-2009, 06:20 PM
#1
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Thread Starter
Garage-Built 347 makes 412 rwhp with 228/230 Cam and stock 243 Heads Mustang Dyno sheet attached. AFR is not shown but averaged about 12.8:1 Timing 24 Degrees.
Specs:
GM LS1 aluminum block, Displacement 347 cubic-inches, GM LS6 243 cylinder heads and valves with 64 cc Combustion Chambers, Comp XR281HR 228/230, .571/.573, 112 LSA, 110 ICL hydraulic roller camshaft, PAC 1518 Valve Springs, FAST 90 Intake, Holley 90 TB, GM 85 mm MAF Sensor, Stock GM Rockers, QTP Longtube Headers, Ford 30 # Injectors, JE Forged flat-top Pistons, Manley 14114 Sportsmaster Forged I-beam connecting rods, Stock GM LS1 Crankshaft, Cometic 0.045 inch head gaskets, Deck Clearance 0.010 inch, Piston Clearance 0.004 inch, Main Bearing Clearance 0.002 inch
Specs:
GM LS1 aluminum block, Displacement 347 cubic-inches, GM LS6 243 cylinder heads and valves with 64 cc Combustion Chambers, Comp XR281HR 228/230, .571/.573, 112 LSA, 110 ICL hydraulic roller camshaft, PAC 1518 Valve Springs, FAST 90 Intake, Holley 90 TB, GM 85 mm MAF Sensor, Stock GM Rockers, QTP Longtube Headers, Ford 30 # Injectors, JE Forged flat-top Pistons, Manley 14114 Sportsmaster Forged I-beam connecting rods, Stock GM LS1 Crankshaft, Cometic 0.045 inch head gaskets, Deck Clearance 0.010 inch, Piston Clearance 0.004 inch, Main Bearing Clearance 0.002 inch
Last edited by Gary Z; 03-19-2009 at 06:46 PM.
03-20-2009, 07:59 PM
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the only main difference from yours to mine is my heads are ported,and i have cats and different headers.Different dynos.i wonder what your would do on a dyno jet.It would be a nice comparison to mine then.nice work.
03-20-2009, 08:46 PM
#5
Very good and a Mustang dyno at that. Also interesting to see you could still use the 30# injectors for that horsepower level and still maintain the AFR. I have been toying with changing out my 30 pounders for my next upgrade.
Looks like your quench is .035". Also what do you figure your compression ratio is?
Looks like your quench is .035". Also what do you figure your compression ratio is?
03-20-2009, 09:53 PM
#7
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Thread Starter
Thanks for the comments, guys. The car is very drivable – idle doesn’t yet always behave. My original 346 with the same intake, heads, exhaust, but a smaller cam (Comp XR265HR 212/218 .558/.563 115 LSA) made 393 hp on a Dynojet at a shop that is no longer in business. If I had used another Dynojet, I would have a better indication of the gain from the new cam. Redtail’s numbers make me want some better heads. The 30# injectors reach 90% duty cycle. My quench is .035”, Compression ratio is about 10.3:1 I don't think I would gain much from a better induction path - MAP stays above 98 kPA at WOT.
Last edited by Gary Z; 03-20-2009 at 10:03 PM.
