Pure Street legal heads

Nitrous Al · 01-16-2002, 11:10 PM

I finally picked a NMRA class to run in, Pure Street. What do you guys think of the GT40P heads? Anyone racing in the Pure Street? What kind of engine combo are you running?

Unit 5302 · 01-17-2002, 03:06 AM

There are guys in the 11's with the GT-40p. They love the head, and the general consensus is that it will outperform the standard GT-40.

Jeff Chambers · 01-17-2002, 07:42 AM

The P is a great head for stock class racing, I run it myself, but the P/S guys are heading for the mid 10's with some of the other heads that are allowed in the class that will outflow the P with the craziest of port jobs. You can build compression ratio with the P's (in excess of 12.5:1 with flattop pistons), but some of the aluminum heads that are allowed have more potential even at lower CR. I think the three favorites of P/S right now are the AFR 165's, TFS TW and Brodix ST5.0. I think its going to take 10's to make the top half of the ladder in qualifying this year.

Be prepared to spin the motor too. Peak HP at 5400 just won't cut it in P/S any more. These are all-out, purpose-built race cars.

andy669 · 01-17-2002, 05:11 PM

I think the Pure Street guys have proven that a set of properly prepared AFR 165's will make more power than a 40somethingcc iron head. Definately the the most popular are the AFR's and TFS TW's. I'm going to try a set of irons on the dyno to see what I can get out of them. But I am planning on running the TW's.
andy

Nitrous Al · 01-18-2002, 06:28 PM

I hear the AFR 165 heads are great for P/S. I was going to send a pair of GT40P heads to Ed Curtis of FlowTech Induction Systems, but what engine combos are running in the 10's? I want to be competitive when the FFW comes to Epping, NH in August. If they broke into the high 10's last season, do you think they'll be running mid to high 10's this summer?

Jeff - What are you running and how fast is your car?

Jeff Chambers · 01-19-2002, 07:11 AM

P/S had three or four guys run in the 10's last season, maybe more. I think Ron Anderson of AFM holds the record down in the 10.80's right now. I couldn't tell you about his combination though.

We've had T/S cars run down in the 11.1x's, with a large part of the field down in the 11.3's and 11.4's regularly. I fully expect to see 10's out of T/S cars this season. We're limited to GT-40P, GT-40, E7, 289, etc.; factory production cast iron heads. We also have to run the stock valve sizes for the heads and can't port them like the P/S guys can. I'm running the P heads with a best of 11.46@117.5, but I'm looking to go better this season.

Nitrous Al · 01-20-2002, 09:17 AM

Jeff- Any inside tricks or secrets you can tell me about setting up a low 11's P/S Mustang? If you were allowed to run a P/S legal intake, heads and larger valves, could your combo run 10's? I went on your 'site and plan on copying your setup, but with P/S in mind.

Jeff Chambers · 01-21-2002, 08:40 AM

Lots of work, lots of testing and lots of tuning. Everything from suspension to the top of the motor needs to be carefully thought out. You won't get there with ordinary bolt-ons. A balanced and blueprinted bottom end, lightened as much as you dare is key to the high rpms that you'll need. Most of the P/S guys are running some sort of aftermarket computer system too; something like the PMS. Most of your power will be found in the heads & cam combination. Give Ed Curtis a call at Flow Tech Induction systems and he'll set you up with a head & cam combo with the potential.

If I could run half of what the P/S guys are able to run, I think we'd be right down there. We're looking for low elevens this year with an outside chance of some tens. I'd love to be able to run race seats, K-members, larger valves, etc.

Keep in mind though that these are all-out race cars. You won't be able to cut it in P/S with a daily driver.

01-16-2002, 11:10 PM	#1
Nitrous Al Registered Member Join Date: May 2000 Location: Everett, MA Posts: 417	Pure Street legal heads I finally picked a NMRA class to run in, Pure Street. What do you guys think of the GT40P heads? Anyone racing in the Pure Street? What kind of engine combo are you running?

01-17-2002, 07:42 AM	#3
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	The P is a great head for stock class racing, I run it myself, but the P/S guys are heading for the mid 10's with some of the other heads that are allowed in the class that will outflow the P with the craziest of port jobs. You can build compression ratio with the P's (in excess of 12.5:1 with flattop pistons), but some of the aluminum heads that are allowed have more potential even at lower CR. I think the three favorites of P/S right now are the AFR 165's, TFS TW and Brodix ST5.0. I think its going to take 10's to make the top half of the ladder in qualifying this year. Be prepared to spin the motor too. Peak HP at 5400 just won't cut it in P/S any more. These are all-out, purpose-built race cars. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

01-17-2002, 05:11 PM	#4
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	I think the Pure Street guys have proven that a set of properly prepared AFR 165's will make more power than a 40somethingcc iron head. Definately the the most popular are the AFR's and TFS TW's. I'm going to try a set of irons on the dyno to see what I can get out of them. But I am planning on running the TW's. andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

01-19-2002, 07:11 AM	#6
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	P/S had three or four guys run in the 10's last season, maybe more. I think Ron Anderson of AFM holds the record down in the 10.80's right now. I couldn't tell you about his combination though. We've had T/S cars run down in the 11.1x's, with a large part of the field down in the 11.3's and 11.4's regularly. I fully expect to see 10's out of T/S cars this season. We're limited to GT-40P, GT-40, E7, 289, etc.; factory production cast iron heads. We also have to run the stock valve sizes for the heads and can't port them like the P/S guys can. I'm running the P heads with a best of 11.46@117.5, but I'm looking to go better this season. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

01-21-2002, 08:40 AM	#8
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Lots of work, lots of testing and lots of tuning. Everything from suspension to the top of the motor needs to be carefully thought out. You won't get there with ordinary bolt-ons. A balanced and blueprinted bottom end, lightened as much as you dare is key to the high rpms that you'll need. Most of the P/S guys are running some sort of aftermarket computer system too; something like the PMS. Most of your power will be found in the heads & cam combination. Give Ed Curtis a call at Flow Tech Induction systems and he'll set you up with a head & cam combo with the potential. If I could run half of what the P/S guys are able to run, I think we'd be right down there. We're looking for low elevens this year with an outside chance of some tens. I'd love to be able to run race seats, K-members, larger valves, etc. Keep in mind though that these are all-out race cars. You won't be able to cut it in P/S with a daily driver. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

01-17-2002, 03:06 AM	#2
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	There are guys in the 11's with the GT-40p. They love the head, and the general consensus is that it will outperform the standard GT-40.

01-18-2002, 06:28 PM	#5
Nitrous Al Registered Member Join Date: May 2000 Location: Everett, MA Posts: 417	I hear the AFR 165 heads are great for P/S. I was going to send a pair of GT40P heads to Ed Curtis of FlowTech Induction Systems, but what engine combos are running in the 10's? I want to be competitive when the FFW comes to Epping, NH in August. If they broke into the high 10's last season, do you think they'll be running mid to high 10's this summer? Jeff - What are you running and how fast is your car?

01-20-2002, 09:17 AM	#7
Nitrous Al Registered Member Join Date: May 2000 Location: Everett, MA Posts: 417	Jeff- Any inside tricks or secrets you can tell me about setting up a low 11's P/S Mustang? If you were allowed to run a P/S legal intake, heads and larger valves, could your combo run 10's? I went on your 'site and plan on copying your setup, but with P/S in mind.

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