Am I making a mistake?

gray87GT · 01-29-2001, 10:35 PM

I am really second guessing myself here with under a week left until the tear down. I have a set of windsor Sr's(64cc) heads....but am worried. I have seen many posts on here that say not to use the Sr's on a N/A 302, and few that say it is OK. I am wondering how much compression I will lose by running these? And how much HP will I gain by using these? The bottom line is.....will I gain as much HP as I would with windsor Jr's(58cc)? Please help guys.....I am going nuts.

NOS_Notch · 01-29-2001, 10:45 PM

Hard to say...why not have the sr's decked to around 58cc???
64 cc probably has to be around 8.5:1
That's a guess though

------------------
4.10's,long tubes & 75 shot...Goes 12.50's
Check it out at http://www.burnouts.webprovider.com

gray87GT · 01-29-2001, 11:55 PM

I am gonna run a F303.......WP recomends .530 lift max with stock pistons......I only have 12 thousandths. I am sh*ting bricks as it is. I don't know much about valve train stuff.

86GT · 01-30-2001, 12:02 AM

I'm gonna run an F303 cam with edelbrock's 6032 head (1.90 valve) with 1.6 roller rockers. Shouldn't be a problem, but since you have 2.02 valves, you should definitely check the p/v clearance. Get them milled and you'll be fine. What intake are you going to run?

gray87GT · 01-30-2001, 12:19 AM

I bought the cobra intake set. I must be way off here. Do you mean get my pistons cut, or shave my heads?? Won't it hurt more milling the heads down?

BowTie Eater 5 Liter · 01-30-2001, 12:42 AM

Milled heads will give you more compression

------------------
1988 Mustang GT, T-5
No Smog Pump (Shorty Belt), Dumps At The End Of Stock H-Pipe (Sounds Mean), K&N Air Filter (Stock Air Box, Removed air silendcer), 198.9 rwhp @4200 (235 Motor!!), 285 lbs-ft @2900 (336 Motor!!!).

gray87GT · 01-30-2001, 12:57 AM

Yeah........but it will decrease my clearance right?, and that is what I am worried about.

86GT · 01-30-2001, 10:21 AM

Yeah it will decrease the clearance but with the 2.02 valves you're almost definitely going to have to get your pistons flycut. And if you're gonna have them cut, you might as well get the heads milled for sure then. Wouldn't hurt, and that way you know everything has clearance.

84_GT350 · 01-30-2001, 09:06 PM

I'm with 86GT. I'd just bite the bullet, have the pistons flycut, then have the heads milled to produce around a 58cc chamber. That 64cc chamber is really for blown engines. Don't the Sr.s come with an optional 58c chamber though?

------------------
1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

Rick 91GT · 01-31-2001, 11:28 AM

I am with the other guys, fly cut the pistons, and mill the heads down. I am running the Holley 2.02's (62.1cc) with a .509 lift cam I have .100 clearance with my stock pistons, but I am fly cutting mine to add a bigger cam as well .548/.565 I haven't made my mind up on milling my heads as I plan on putting a blower on the car in the future and it would like the bigger chambers. Remeber fly cutting lowers the compression.
Rick

------------------
My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98

gray87GT · 02-01-2001, 01:54 AM

Well I just wanted to give you guys an update. I decided to save my *** and order the Jr's. I just don't wanna mess with the lower end right now. I called World Products and they said the Jr's will work fine with the F303. I start on saturday so I'll be posting some picks during the whole deal....if I can figure out how to. Thanks to everybody who has given me info in the short time I have been on this site.

01-29-2001, 10:35 PM	#1
gray87GT Registered Member Join Date: Jan 2001 Location: Minnesota Posts: 177	Am I making a mistake? I am really second guessing myself here with under a week left until the tear down. I have a set of windsor Sr's(64cc) heads....but am worried. I have seen many posts on here that say not to use the Sr's on a N/A 302, and few that say it is OK. I am wondering how much compression I will lose by running these? And how much HP will I gain by using these? The bottom line is.....will I gain as much HP as I would with windsor Jr's(58cc)? Please help guys.....I am going nuts.

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01-29-2001, 10:45 PM	#2
NOS_Notch Registered Member Join Date: Sep 2000 Location: Fresno,CA. USA Posts: 384	Hard to say...why not have the sr's decked to around 58cc??? 64 cc probably has to be around 8.5:1 That's a guess though ------------------ 4.10's,long tubes & 75 shot...Goes 12.50's Check it out at http://www.burnouts.webprovider.com

01-29-2001, 11:55 PM	#3
gray87GT Registered Member Join Date: Jan 2001 Location: Minnesota Posts: 177	I am gonna run a F303.......WP recomends .530 lift max with stock pistons......I only have 12 thousandths. I am sh*ting bricks as it is. I don't know much about valve train stuff.

01-30-2001, 12:02 AM	#4
86GT Sniffed too much n20 Join Date: Oct 1998 Location: Ont, Canada Posts: 1,018	I'm gonna run an F303 cam with edelbrock's 6032 head (1.90 valve) with 1.6 roller rockers. Shouldn't be a problem, but since you have 2.02 valves, you should definitely check the p/v clearance. Get them milled and you'll be fine. What intake are you going to run?

01-30-2001, 12:19 AM	#5
gray87GT Registered Member Join Date: Jan 2001 Location: Minnesota Posts: 177	I bought the cobra intake set. I must be way off here. Do you mean get my pistons cut, or shave my heads?? Won't it hurt more milling the heads down?

01-30-2001, 12:42 AM	#6
BowTie Eater 5 Liter Registered Member Join Date: Nov 2000 Location: Maple Ridge B.C. Canada, The Best Place In The World Posts: 871	Milled heads will give you more compression ------------------ 1988 Mustang GT, T-5 No Smog Pump (Shorty Belt), Dumps At The End Of Stock H-Pipe (Sounds Mean), K&N Air Filter (Stock Air Box, Removed air silendcer), 198.9 rwhp @4200 (235 Motor!!), 285 lbs-ft @2900 (336 Motor!!!).

01-30-2001, 12:57 AM	#7
gray87GT Registered Member Join Date: Jan 2001 Location: Minnesota Posts: 177	Yeah........but it will decrease my clearance right?, and that is what I am worried about.

01-30-2001, 10:21 AM	#8
86GT Sniffed too much n20 Join Date: Oct 1998 Location: Ont, Canada Posts: 1,018	Yeah it will decrease the clearance but with the 2.02 valves you're almost definitely going to have to get your pistons flycut. And if you're gonna have them cut, you might as well get the heads milled for sure then. Wouldn't hurt, and that way you know everything has clearance.

01-30-2001, 09:06 PM	#9
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	I'm with 86GT. I'd just bite the bullet, have the pistons flycut, then have the heads milled to produce around a 58cc chamber. That 64cc chamber is really for blown engines. Don't the Sr.s come with an optional 58c chamber though? ------------------ 1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

01-31-2001, 11:28 AM	#10
Rick 91GT Procharged! Join Date: May 1999 Location: Hanover, PA Posts: 1,539	I am with the other guys, fly cut the pistons, and mill the heads down. I am running the Holley 2.02's (62.1cc) with a .509 lift cam I have .100 clearance with my stock pistons, but I am fly cutting mine to add a bigger cam as well .548/.565 I haven't made my mind up on milling my heads as I plan on putting a blower on the car in the future and it would like the bigger chambers. Remeber fly cutting lowers the compression. Rick ------------------ My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98

02-01-2001, 01:54 AM	#11
gray87GT Registered Member Join Date: Jan 2001 Location: Minnesota Posts: 177	Well I just wanted to give you guys an update. I decided to save my *** and order the Jr's. I just don't wanna mess with the lower end right now. I called World Products and they said the Jr's will work fine with the F303. I start on saturday so I'll be posting some picks during the whole deal....if I can figure out how to. Thanks to everybody who has given me info in the short time I have been on this site.