Any ProComp Motorsports LS1 head users?
05-19-2014, 08:39 PM
#61
On The Tree
Flow results in Ok guys here are the flow figures for the pro comp cnc heads with the 3 angle valve job and blending.
All details are there to see not just numbers , test orifice flow @ 10" with corrected range etc - overall the heads will flow approx 550hp at the .614 lift my cam goes too.
The cylinder head guy was impressed how it flowed on the bench. He said that are it flowed more the head got quieter and quieter which was not very common to see.
Heads will be Installed tomorrow and dyno by end week so will see how much of a gain these pro comps get going from cam only to head and cam.
All details are there to see not just numbers , test orifice flow @ 10" with corrected range etc - overall the heads will flow approx 550hp at the .614 lift my cam goes too.
The cylinder head guy was impressed how it flowed on the bench. He said that are it flowed more the head got quieter and quieter which was not very common to see.
Heads will be Installed tomorrow and dyno by end week so will see how much of a gain these pro comps get going from cam only to head and cam.
05-20-2014, 04:18 AM
#62
On The Tree
Detailed results and comparison To give the actually reality of these pro comp 3017 cnc ported ls1 heads , I have worked out cfm numbers into 28" water flow and put a comparison to stock 241 and 243 cast flows. This should give a truthful and realistic result of these heads and people can make there own judgement based on fact not here say.
Note the pro comp (PC) heads were brought bare and have had plunge cut, 3 angle valve job and 3 hours worth hand blending.
Lift 100 / 200 / 300 / 400 / 500 / 600
241 67 / 122 / 178 / 215 / 219 / 227 cfm @ 28" intake
243 62 / 126 / 184 / 224 / 251 / 256 cfm @ 28" intake
PC 62 / 128 / 192 / 225 / 248 / 270 cfm @ 28" intake
241 52 / 97 / 133 / 156 / 170 / 180 cfm @ 28" exhaust
243 57 / 108 / 143 / 163 / 180 / 183 cfm @ 28" exhaust
PC 49 / 97 / 136 / 165 / 181 / 194 cfm @ 28" exhaust
Mid lift
241 @ 400 lift = 215/156
243 @ 400 lift = 224/163
PC @ 400 lift = 225/164
Average cfm
241 = 197 cfm intake
243 = 216 cfm intake
PC = 221 cfm intake
241 = 152 cfm exhaust
243 = 159 cfm exhaust
PC = 158 cfm exhaust
During the flow test, on the pro comp head, it was noticed that as the air increased the noise of head got more and more quiet which is quiet rare as it's usually the opposite.
Note the pro comp (PC) heads were brought bare and have had plunge cut, 3 angle valve job and 3 hours worth hand blending.
Lift 100 / 200 / 300 / 400 / 500 / 600
241 67 / 122 / 178 / 215 / 219 / 227 cfm @ 28" intake
243 62 / 126 / 184 / 224 / 251 / 256 cfm @ 28" intake
PC 62 / 128 / 192 / 225 / 248 / 270 cfm @ 28" intake
241 52 / 97 / 133 / 156 / 170 / 180 cfm @ 28" exhaust
243 57 / 108 / 143 / 163 / 180 / 183 cfm @ 28" exhaust
PC 49 / 97 / 136 / 165 / 181 / 194 cfm @ 28" exhaust
Mid lift
241 @ 400 lift = 215/156
243 @ 400 lift = 224/163
PC @ 400 lift = 225/164
Average cfm
241 = 197 cfm intake
243 = 216 cfm intake
PC = 221 cfm intake
241 = 152 cfm exhaust
243 = 159 cfm exhaust
PC = 158 cfm exhaust
During the flow test, on the pro comp head, it was noticed that as the air increased the noise of head got more and more quiet which is quiet rare as it's usually the opposite.
05-22-2014, 05:02 AM
#67
On The Tree
Pro comp / speedmaster = CRAP!!!!!!!! Ok so I've now done the full test with the procomp ls1 cnc heads (eBay heads, speed master heads - part number PC3017).
I bought them bare ($670) had stainless valves fitted, 3 angle valve job, plunge cut and hand blending into the valve seats and bench flowed ($925) , had them fitted last night with new ls7 lifters , 0.51 gm head gasket and new head bolts. Car was dyno tuned today.
Overview - car is a 6 speed manual. Ls1.
With 1 5/8" headers, 2.5 inch metal hi lfow cats, Twin 2.5 inch exhaust system, over the radiator air intake, BTR stage 2 camshaft (227/234, .614/.576 lift, 113 lobe), BTR platinum spring kit, hardened pushrods 7.400" , ls6 manifold with 102mm t/b it laid down 359.4 whp.
Added the "pro comp" heads with retune and it laid down 369 whp.
NOT EVEN A GAIN OF 10 whp !!!!!!!
For the $2000 plus I spent for such a pathetic gain this proves that these heads are a complete waste of time and money.
A good hand port of the stock 241 for under $1000 would have netted a larger gain.
275 kilowatts at the wheels for a CNC ported head and 227/234 cammed M6 LS1 is well below average to say the least.
People the proof is in the pudding here for you. I've eaten my pudding so please learn from this a stay CLEAR of cheap procomp / eBay / speedmaster heads.
I bought them bare ($670) had stainless valves fitted, 3 angle valve job, plunge cut and hand blending into the valve seats and bench flowed ($925) , had them fitted last night with new ls7 lifters , 0.51 gm head gasket and new head bolts. Car was dyno tuned today.
Overview - car is a 6 speed manual. Ls1.
With 1 5/8" headers, 2.5 inch metal hi lfow cats, Twin 2.5 inch exhaust system, over the radiator air intake, BTR stage 2 camshaft (227/234, .614/.576 lift, 113 lobe), BTR platinum spring kit, hardened pushrods 7.400" , ls6 manifold with 102mm t/b it laid down 359.4 whp.
Added the "pro comp" heads with retune and it laid down 369 whp.
NOT EVEN A GAIN OF 10 whp !!!!!!!
For the $2000 plus I spent for such a pathetic gain this proves that these heads are a complete waste of time and money.
A good hand port of the stock 241 for under $1000 would have netted a larger gain.
275 kilowatts at the wheels for a CNC ported head and 227/234 cammed M6 LS1 is well below average to say the least.
People the proof is in the pudding here for you. I've eaten my pudding so please learn from this a stay CLEAR of cheap procomp / eBay / speedmaster heads.
