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Big DSM Camshaft Specification Guide

Canadian_CD9A

Proven Member
775
441
Feb 10, 2012
Winnipeg, MB_Canada
I've noticed myself posting this a couple of times, so I'll just make one big thread about it. This is a list I've compiled of camshaft offerings for the DSM 4G63 engine. This information is correct to the best of my knowledge, but please feel free to add or correct any information you may have, or tell me about anything I've missed. Lots of these camshafts measure duration at either 1mm (0.040") or at 1.27mm (0.050"). If you have the number for the opposite figure, please add that as well.

GSC, Kelford and Tomei's lift figures are calculated with a 1.73 rocker; HKS, Web, Crower and BC use 1.7, so I equalized them to 1.73. I don't know what Jun uses, but I suspect a 1.73 (numbers unchanged).

**Keep in mind that the duration numbers are either measured at 1mm (0.040") or at 0.050" - you cannot compare these values!**

BC 272 Lift: 10.36/9.83 (Stage 2)
BC 272 Duration @ 0.050": 208/212

BC 276 Lift: 11.27/11.27 (Stage 3)
BC 276 Duration @ 0.050": 220/220

BC 284/280 Lift: 11.63/11.11 (Stage 4)
BC 284/280 Duration @ 0.050": 230/226

BC 280 Lift: 10.90/10.79 (old profile)
BC 280 Duration @ 0.050": 218/216

Buschur BF272 Lift: 11.71/11.71
Buschur BF272 Duration @ 0.050": 212/211

Buschur BF280 Lift: 12.23/12.23
Buschur BF280 Duration @ 0.050": 219/221

Comp 101100 Lift: 10.34/9.93 ***These are the same as FP1s
Comp 101100 Duration @ 0.050": 204/204

Comp 101200 Lift: 10.44/10.03 ***These are the same as FP2s
Comp 101200 Duration @ 0.050": 212/212

Comp 101300 Lift: 10.44/10.03 ***These are the same as FP3s
Comp 101300 Duration @ 0.050"" 212/212 - note: different centerline, faster ramp

Comp 101400 Lift: 10.54/10.13 ***These are the same as FP4s
Comp 101400 Duration @ 0.050": 220/220

Forced Performance FP1x Lift: 10.47/10.06
Forced Performance FP1x Duration @ 0.050": 204/204

Forced Performance FP2x Lift: 10.57/10.16
Forced Performance FP2x Duration @ 0.050": 212/212

Forced Performance FP3x Lift: 10.92/10.52
Forced Performance FP3x Duration @ 0.050": 212/212

Forced Performance FP4R Lift: 11.18/10.80
Forced Performance FP4R Duration @ 0.050": 224/224

Forced Performance FP5R Lift: 12.07/11.69
Forced Performance FP5R Duration @ 0.050": 232/232

Crower 264/264 Lift: 10.11/9.45
Crower 264 Duration @ 0.050": 204/204

Crower 264/272 Lift: 10.29/9.77
Crower 264/272 Duration @ 0.050": 204/212

Crower 272/272 Lift: 10.17/9.80
Crower 272/272 Duration @ 0.050": 211/212

Crower 280/280 Lift: 10.62/10.11
Crower 280/280 Duration @ 0.050": 213/215

Crower 288/288 Lift: 10.99/10.76
Crower 288/288 Duration @ 0.050": 218/216

GSC S1 Lift: 11.0/10.5
GSC S1 Duration @ 0.040": 216/220

GSC S2 Lift: 11.03/11.03
GSC S2 Duration @ 0.040": 230/230

GSC S3 Lift: 11.70/11.70
GSC S3 Duration @ 0.040": 238/238

GSC R2 Lift: 12.00/12.00
GSC R2 Duration @ 0.040": 236/236

HKS 264 Lift: 10.48/9.97
HKS 264 Duration @ 0.040": 210/210

HKS 272 Lift: 10.48/9.97
HKS 272 Duration @ 0.040": 218/218
HKS 272 Duration @ 0.050": 213/213

HKS 280 Lift: 11.00/10.38
HKS 280 Duration @ 0.040": 222/222

Jun 264 Lift: 10.50/10.50
Jun 264 Duration @ 0.040": unknown, suspected to be approx. 228/228

Jun 272 Lift: 10.63/10.63 ***Evo VIII spec, likely same as DSM
Jun 272 Duration @ 0.040": 235/235

Kelford TX258 Lift: 10.50/10.50
Kelford TX258 Duration @ 0.040": 208/220

Kelford TX264 Lift: 11.00/10.35
Kelford TX264 Duration @ 0.040": 216/216

Kelford TX268 Lift: 11.00/10.50
Kelford TX268 Duration @ 0.040": 216/220

Kelford TX272 Lift: 11.00/11.00
Kelford TX272 Duration @ 0.040": 226/226

Kelford TX272L Lift: 10.00/10.00
Kelford TX272L Duration @ 0.040": 226/226

Kelford TX276HL Lift: 12.50/12.00
Kelford TX276HL Duration @ 0.040": 234/230

Kelford TX278 Lift: 11.00/11.00
Kelford TX278 Duration @ 0.040": 226/230

Kelford TX280 Lift: 11.50/11.00
Kelford TX280 Duration @ 0.040": 238/230

Kelford TX280R Lift: 11.50/11.50
Kelford TX280R Duration @ 0.040": 238/242

Kelford TX284HL Lift: 12.50/12.00
Kelford TX284HL Duration @ 0.040": 242/238

Kelford TX288 Lift: 12.00/11.50
Kelford TX288 Duration @ 0.040": 242/238

Kelford TX294 Lift: 12.00/12.00
Kelford TX294 Duration @ 0.040": 250/256

Kelford TX294HL Lift: 12.50/12.00
Kelford TX294HL Duration @ 0.040": 250/244

Tomei Poncam 260 Lift: 10.70/10.20
Tomei Poncam 260 Duration @ 0.040": 215.5/214.5
Tomei Poncam 260 Duration @ 0.050": 209/209

Tomei Procam 270 Lift: 11.50/11.50
Tomei Procam 270 Duration @ 0.040": 227.5/226.5
Tomei Procam 270 Duration @ 0.050": 221.0/220.5

Tomei Procam 280 Lift: 11.50/11.50
Tomei Procam 280 Duration @ 0.040": 232/233
Tomei Procam 280 Duration @ 0.050": 225.5/228.5

Web Cams 546/547 Lift: 10.34/9.95
Web Cams 546/547 Duration @ 0.050": 206/206

Web Cams 452/228 Lift: 10.73/10.09
Web Cams 452/228 Duration @ 0.050": 214/212

Web Cams 453/258 Lift: 10.73/10.09
Web Cams 453/258 Duration @ 0.050": 222/212
 
Last edited by a moderator:

TuskeeTuner

Proven Member
50
8
Dec 16, 2020
Everett, Washington
I've noticed myself posting this a couple of times, so I'll just make one big thread about it. This is a list I've compiled of camshaft offerings for the DSM 4G63 engine. This information is correct to the best of my knowledge, but please feel free to add or correct any information you may have, or tell me about anything I've missed. Lots of these camshafts measure duration at either 1mm (0.040") or at 1.27mm (0.050"). If you have the number for the opposite figure, please add that as well.

GSC, Kelford and Tomei's lift figures are calculated with a 1.73 rocker; HKS, Web, Crower and BC use 1.7, so I equalized them to 1.73. I don't know what Jun uses, but I suspect a 1.73 (numbers unchanged).

**Keep in mind that the duration numbers are either measured at 1mm (0.040") or at 0.050" - you cannot compare these values!**

BC 272 Lift: 10.36/9.83 (Stage 2)
BC 272 Duration @ 0.050": 208/212

BC 276 Lift: 11.27/11.27 (Stage 3)
BC 276 Duration @ 0.050": 220/220

BC 284/280 Lift: 11.63/11.11 (Stage 4)
BC 284/280 Duration @ 0.050": 230/226

BC 280 Lift: 10.90/10.79 (old profile)
BC 280 Duration @ 0.050": 218/216

Buschur BF272 Lift: 11.71/11.71
Buschur BF272 Duration @ 0.050": 212/211

Buschur BF280 Lift: 12.23/12.23
Buschur BF280 Duration @ 0.050": 219/221

Comp 101100 Lift: 10.34/9.93 ***These are the same as FP1s
Comp 101100 Duration @ 0.050": 204/204

Comp 101200 Lift: 10.44/10.03 ***These are the same as FP2s
Comp 101200 Duration @ 0.050": 212/212

Comp 101300 Lift: 10.44/10.03 ***These are the same as FP3s
Comp 101300 Duration @ 0.050"" 212/212 - note: different centerline, faster ramp

Comp 101400 Lift: 10.54/10.13 ***These are the same as FP4s
Comp 101400 Duration @ 0.050": 220/220

Forced Performance FP1x Lift: 10.47/10.06
Forced Performance FP1x Duration @ 0.050": 204/204

Forced Performance FP2x Lift: 10.57/10.16
Forced Performance FP2x Duration @ 0.050": 212/212

Forced Performance FP3x Lift: 10.92/10.52
Forced Performance FP3x Duration @ 0.050": 212/212

Forced Performance FP4R Lift: 11.18/10.80
Forced Performance FP4R Duration @ 0.050": 224/224

Forced Performance FP5R Lift: 12.07/11.69
Forced Performance FP5R Duration @ 0.050": 232/232

Crower 264/264 Lift: 10.11/9.45
Crower 264 Duration @ 0.050": 204/204

Crower 264/272 Lift: 10.29/9.77
Crower 264/272 Duration @ 0.050": 204/212

Crower 272/272 Lift: 10.17/9.80
Crower 272/272 Duration @ 0.050": 211/212

Crower 280/280 Lift: 10.62/10.11
Crower 280/280 Duration @ 0.050": 213/215

Crower 288/288 Lift: 10.99/10.76
Crower 288/288 Duration @ 0.050": 218/216

GSC S1 Lift: 11.0/10.5
GSC S1 Duration @ 0.040": 216/220

GSC S2 Lift: 11.03/11.03
GSC S2 Duration @ 0.040": 230/230

GSC S3 Lift: 11.70/11.70
GSC S3 Duration @ 0.040": 238/238

HKS 264 Lift: 10.48/9.97
HKS 264 Duration @ 0.040": 210/210

HKS 272 Lift: 10.48/9.97
HKS 272 Duration @ 0.040": 218/218
HKS 272 Duration @ 0.050": 213/213

HKS 280 Lift: 11.00/10.38
HKS 280 Duration @ 0.040": 222/222

Jun 264 Lift: 10.50/10.50
Jun 264 Duration @ 0.050": ???

Jun 272 Lift: 10.63/10.63 ***Evo VIII spec
Jun 272 Duration @ 0.050": 211.5/211.5

Kelford TX258 Lift: 10.50/10.50
Kelford TX258 Duration @ 0.040": 208/220

Kelford TX264 Lift: 11.00/10.35
Kelford TX264 Duration @ 0.040": 216/216

Kelford TX268 Lift: 11.00/10.50
Kelford TX268 Duration @ 0.040": 216/220

Kelford TX272 Lift: 11.00/11.00
Kelford TX272 Duration @ 0.040": 226/226

Kelford TX272L Lift: 10.00/10.00
Kelford TX272L Duration @ 0.040": 226/226

Kelford TX276HL Lift: 12.50/12.00
Kelford TX276HL Duration @ 0.040": 234/230

Kelford TX278 Lift: 11.00/11.00
Kelford TX278 Duration @ 0.040": 226/230

Kelford TX280 Lift: 11.50/11.00
Kelford TX280 Duration @ 0.040": 238/230

Kelford TX280R Lift: 11.50/11.50
Kelford TX280R Duration @ 0.040": 238/242

Kelford TX284HL Lift: 12.50/12.00
Kelford TX284HL Duration @ 0.040": 242/238

Kelford TX288 Lift: 12.00/11.50
Kelford TX288 Duration @ 0.040": 242/238

Kelford TX294 Lift: 12.00/12.00
Kelford TX294 Duration @ 0.040": 250/256

Kelford TX294HL Lift: 12.50/12.00
Kelford TX294HL Duration @ 0.040": 250/244

Tomei Poncam 260 Lift: 10.70/10.20
Tomei Poncam 260 Duration @ 0.040": 215.5/214.5
Tomei Poncam 260 Duration @ 0.050": 209/209

Tomei Procam 270 Lift: 11.50/11.50
Tomei Procam 270 Duration @ 0.040": 227.5/226.5
Tomei Procam 270 Duration @ 0.050": 221.0/220.5

Tomei Procam 280 Lift: 11.50/11.50
Tomei Procam 280 Duration @ 0.040": 232/233
Tomei Procam 280 Duration @ 0.050": 225.5/228.5

Web Cams 546/547 Lift: 10.34/9.95
Web Cams 546/547 Duration @ 0.050": 206/206

Web Cams 452/228 Lift: 10.73/10.09
Web Cams 452/228 Duration @ 0.050": 214/212

Web Cams 453/258 Lift: 10.73/10.09
Web Cams 453/258 Duration @ 0.050": 222/212
Please sticky this.
 

Canadian_CD9A

Proven Member
775
441
Feb 10, 2012
Winnipeg, MB_Canada
Some edits were made and another cam profile added. If you find any common cams that weren't included here, please post them!

While compiling this data, it became apparent that there is a trend on the more recent DSM cams to go really high in lift relative to the cams of yesteryear (GSC and Kelford, I'm looking at you), and I've noticed that people get really excited about those higher lift numbers. However, port flow data for 1G and 2G heads shows that the stock ports make very little, or no flow gain past 0.350" lift, which is only 8.9 mm. They tap out around 220 cfm on the intake ports and 200 cfm on the exhaust ports, while a ported head will go 270/240 or more, and continue making flow increases to the 0.500" level (around 12.7mm lift). Stock DSM camshafts typically range from 0.325" to 0.350" of lift, depending on model. At this point, more lift by itself on stock ports will not increase power, and all gains in power from a camshaft change are made by changes in duration, overlap, ramp rate and LSA. So, to take full advantage of camshafts that offer more than 9.0mm of lift, you will need a ported cylinder head. Does this mean that all aftermarket camshafts are a waste on a stock head? Of course not! There is still a lot to gain from well-matched cams on your setup, and low-lift camshafts do not mean low performance! I chose Jun 264s to go with my Curt Brown Racing 2G head. Although the lift is a relatively puny 10.50mm/10.50mm, they have a very quick ramp rate and a lot of duration (very comparable to GSC S2), which will perform great on stock ports, and create a responsive and broad torque curve with a ported head.

Data borrowed from: http://users.erols.com/srweiss/tablehdc.htm#MITSUBISHI

ManufacturerPort/VolValve Size Int/ExhCombust. Chamber Vol0.10.150.20.250.30.350.40.450.50.550.6
1G Ported Mike +1mm valvesN/A35mm/31.5mmN/A87/78-169/166-230/208-257/227-270/239--
2GN/A34mm/30.5mmN/A80/73-155/146-211/181-227/183229/183---
2G PortedN/A-N/A91/73-173/147-226/210-254/234269/240---
4G63 Gen I '89-94 CNC M2 Race SystemsN/A35mm/ 30.5mmN/A----251/202-283/240284/249-286/260-
4G63 Alaniz Cyl Heads (stock)N/A34mm/ 30.5mmN/A77/75117/117154/151187/174206/189216/197220/199221/200223/202--
4G63 Ported Level 4 PolkN/A35mm/-N/A106/-161/-188/-241/-270/-298/-309/-320/-334/-346/-357/-
4G63 AMS SF600N/A34mm/ 30.5mmN/A81/67119/105153/138183/173201/192209/203211/208205/209206/211--
4G63 Ported AMS SF600N/A34mm/ 30.5mmN/A107/88151/134189/193222/229244/245258/249269/255274/261277/265--
4G63 1G Ported Fox Lake SF600N/A-N/A------280/-289/-291/---
4G63 2G Ported Fox Lake SF600N/A-N/A------272-281/-287/---
1GN/A34mm/30.5mmN/A78/84-150/170-204/205218/206225/-----
1G Mild PortN/A-N/A83/--157/--222/-235/-244/-----
EVO 1 Sabre Heads JSN/A34mm/30.5mmN/A80/72122/120161/163197/189225/198238/202246/205251/205252/205--
EVO 1 Ported Sabre Heads SF110N/A34mm/31.5mmN/A78/79118/132159/172197/194225/207240/219251/224257/227261/231--
 
Last edited:

1990TSIAWDTALON

Moderator
9,261
5,056
Nov 14, 2013
Independence, Kansas
My 92 is running "little" Kelford 264s and she is a handful at only 24lbs. When I use the override button (scramble button) and go to 34lbs, you really feel and hear the difference.
Appreciate the additional info for the members to have. It should help everyone make good choices on cams for their particular applications.
 
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