Engine Quest Head work results
04-06-2016 | 04:34 PM
#61
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
I like those rockers a lot and I've been running them for about 5-6 years now. I used to run the hi-tech 1620's but changed to the 1625 Utra Pro Magnums when they came out. They also give a lot more clearance under the valves. Also running them on the MPI's I'm building.
04-06-2016 | 05:20 PM
#62
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Joined: Jul 2004
Posts: 11,332
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From: chicago
I like those rockers a lot and I've been running them for about 5-6 years now. I used to run the hi-tech 1620's but changed to the 1625 Utra Pro Magnums when they came out. They also give a lot more clearance under the valves. Also running them on the MPI's I'm building.
It was a tough call being a cheap bastard as I am, but went with the "XD"s anyway.
Good to hear someone else is using them with good results.
04-06-2016 | 05:26 PM
#63
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Joined: Jul 2004
Posts: 11,332
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From: chicago
Eppic disappointment.
I had the chance to do a back-to-back flow comparison comparing factory "advertised" numbers with actual flow numbers from a SF600 with a FlowCom and Audi swirl meter, 4.500 bore fixture, and see just what the truth is.
Heads are a good comparison for competitors:
Dart Pro1 310 as cast, bare, from Dart
AFR 305 as cast, assembled from AFR
Dart 310, valve job from Dart, REV 2.25 intake no backcut, REV 1.88 Inconel ex (tulip style valve), advertised intake @ 28" .800 (all they give you from Dart) 369 cfm.
Truth:
Left/right/ex
.2 140/141/111
.3 207/207/151
.4 271/271/192
.5 322/312/227
.6 351/329/254
.7 365/329/271
.8 341/335/281
The left port is not a mis-print. Very disappointing.
Next: AFR 305 as-cast, assembled from AFR with their valves, 2.25 intake with backcut (angle unknown) AFR 1.88 exhaust.
AFR as-cast advertised:
right/ex
.2 154/131
.3 223/176
.4 287/219
.5 335/251
.6 363/276
.7---------
Truth:
right/left/ex
.2 146/143/109
.3 209/210/144
.4 268/276/185
.5 324/327/223
.6 366/336/250
.7 361/343/262
.8 ---/345/271
The bowls are nicely CNC blended but transition from the seat to the chamber is terrible. The exhaust port I believe suffers far worse because of this than the intake.
I had the chance to do a back-to-back flow comparison comparing factory "advertised" numbers with actual flow numbers from a SF600 with a FlowCom and Audi swirl meter, 4.500 bore fixture, and see just what the truth is.
Heads are a good comparison for competitors:
Dart Pro1 310 as cast, bare, from Dart
AFR 305 as cast, assembled from AFR
Dart 310, valve job from Dart, REV 2.25 intake no backcut, REV 1.88 Inconel ex (tulip style valve), advertised intake @ 28" .800 (all they give you from Dart) 369 cfm.
Truth:
Left/right/ex
.2 140/141/111
.3 207/207/151
.4 271/271/192
.5 322/312/227
.6 351/329/254
.7 365/329/271
.8 341/335/281
The left port is not a mis-print. Very disappointing.
Next: AFR 305 as-cast, assembled from AFR with their valves, 2.25 intake with backcut (angle unknown) AFR 1.88 exhaust.
AFR as-cast advertised:
right/ex
.2 154/131
.3 223/176
.4 287/219
.5 335/251
.6 363/276
.7---------
Truth:
right/left/ex
.2 146/143/109
.3 209/210/144
.4 268/276/185
.5 324/327/223
.6 366/336/250
.7 361/343/262
.8 ---/345/271
The bowls are nicely CNC blended but transition from the seat to the chamber is terrible. The exhaust port I believe suffers far worse because of this than the intake.
04-08-2016 | 08:45 AM
#66
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
One other small FYI on the EQ heads. My standard spark plug socket does not fit in the recessed area so I could not use a spark plug socket to install the plugs. I had to use a standard socket with a thin wall in order to install them. Just a heads up.
Last edited by Panther; 04-08-2016 at 08:53 AM. Reason: add pics
04-08-2016 | 08:55 AM
#67
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Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
What plugs are you using?
