What to do now?

Coupe Devil · 02-21-2003, 05:36 PM

OK just got off phone with machine shop. I could not for the life of me remember what pistons I put in my 306 when I first put it together over 3 years ago. So I call and they tell me that I had Cast (hyper) Flat Top .030 over 86 style pistons. Now with my Gt-40 heads on the way and wanting to run a Trick Flow stage 1 cam. Im not sure if it will work or not.. Anyone have any idea how think the top's of the 86 pistons are. How much can I dish the pistons without worrying about cutting through the top???
Can I cut the pistons enough to run the stock size valves and the Trick flow Stage 1 cam?? Here are the cam specs:

Specifications:
* Advertised Duration: 275 intake/279 exhaust
* Duration at .050 in. lift: 221 intake/225 exhaust
* Gross valve lift: .499 in. intake/.510 in. exhaust
* Lobe Separation: 112 degrees
* RPM Range: 2,000 to 5,500

Any help is Greatly appreciated

Thanks
Bradley

Coolbreeze · 02-21-2003, 09:57 PM

Do yo remeber where you got the pistons from?? They can be flat tops but have valve reliefs that can fit the extra lift.

Coupe Devil · 02-21-2003, 11:44 PM

Yeah I called the place I got the pistons today. .gonna call em back Monday and talk to them again..maybe they will have valve reliefs? I hope the ydo.

Bradley

Coupe50h · 02-22-2003, 11:07 AM

why do you use all these 86 parts? I believe you said you had 86 heads too, but on an 88?
Well the 86 pistons can be cut enough, but id just get those weak bastards outta there.

02-21-2003, 05:36 PM	#1
Coupe Devil Moderator Join Date: Mar 2001 Location: Myrtle Beach SC Posts: 1,643	What to do now? OK just got off phone with machine shop. I could not for the life of me remember what pistons I put in my 306 when I first put it together over 3 years ago. So I call and they tell me that I had Cast (hyper) Flat Top .030 over 86 style pistons. Now with my Gt-40 heads on the way and wanting to run a Trick Flow stage 1 cam. Im not sure if it will work or not.. Anyone have any idea how think the top's of the 86 pistons are. How much can I dish the pistons without worrying about cutting through the top??? Can I cut the pistons enough to run the stock size valves and the Trick flow Stage 1 cam?? Here are the cam specs: Specifications: * Advertised Duration: 275 intake/279 exhaust * Duration at .050 in. lift: 221 intake/225 exhaust * Gross valve lift: .499 in. intake/.510 in. exhaust * Lobe Separation: 112 degrees * RPM Range: 2,000 to 5,500 Any help is Greatly appreciated Thanks Bradley __________________ 1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5. Built Ford Tough Moderator Last edited by Coupe Devil; 02-21-2003 at 06:18 PM..

02-21-2003, 09:57 PM	#2
Coolbreeze Registered Member Join Date: Oct 2000 Location: ~Columbus~GA~31909~ Posts: 156	Do yo remeber where you got the pistons from?? They can be flat tops but have valve reliefs that can fit the extra lift. __________________ Mike Blown~AOD'ed~331~ T-top~ 86GT Check out car on my page here ------ > ~~My 86GT T-top ~~

02-21-2003, 11:44 PM	#3
Coupe Devil Moderator Join Date: Mar 2001 Location: Myrtle Beach SC Posts: 1,643	Yeah I called the place I got the pistons today. .gonna call em back Monday and talk to them again..maybe they will have valve reliefs? I hope the ydo. Bradley __________________ 1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5. Built Ford Tough Moderator

02-22-2003, 11:07 AM	#4
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	why do you use all these 86 parts? I believe you said you had 86 heads too, but on an 88? Well the 86 pistons can be cut enough, but id just get those weak bastards outta there. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear