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Topic: Intake spacer and other upgrades (Read 6745 times) previous topic - next topic

Intake spacer and other upgrades

Reply #30
So I'm MEASURING the 1.7 rockers are still the best bet?

:hick:

Intake spacer and other upgrades

Reply #31
Gotta question:  If 1.7 rockers would work, why wouldn't a bigger cam work?

Intake spacer and other upgrades

Reply #32
Quote from: kingcars;167985
Gotta question:  If 1.7 rockers would work, why wouldn't a bigger cam work?


Because roller rockers do NOT increase duration and they are only increasing the amount of lift at the valve by around .030"
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

Intake spacer and other upgrades

Reply #33
Quote from: kingcars;167985
Gotta question:  If 1.7 rockers would work, why wouldn't a bigger cam work?

It will, IF you were only increasing lift and none of the other parameters...

Intake spacer and other upgrades

Reply #34
Quote from: kingcars;167985
Gotta question:  If 1.7 rockers would work, why wouldn't a bigger cam work?


 Man, I really don't know what is the max lift is with SO flattops. I do know that on my 88 SO pistons, there are NO valve reliefs. I've seen a 93 ho with hypereutic pistons and it had 4 valve reliefs. Don't ask me why they put 4. I think it's dumb, but they want to make it easy for the assembly line so they can put the pistons on either bank. IIRC gt-40y's will not work, the intake valves were just too big. Unless I measure, write stuff down exactly and don't lose it, I forget. It is some work to pull heads and check this stuff in the vehicle, but that's what needs to be done.
 Cam selection is critical especially with speed density. Any camshaft should be degreed into a motor and valve piston clearances checked. Armed with that info, you can experiment with different combos and it also lets the cam grinders know you are not going in blind. I believe one of the ho cams specs is .444 lift w/1.6 rockers, 266 duration with 115 lobe centers. 1.7's would change it to .472. If you have enough clearance you could run a cam with that lift. Duration should be kept in the 270's and it can change effective lift. Lobe centers should be no less than 114.
 Valve events are a little difficult to understand and explain. Hopefully, I'll know more if and when my camshaft is degreed.

 Mike
[SIGPIC][/SIGPIC]88 t-bird: 5.0ho, gt40y, crane 2031, fms 1.7, paxton@5#, aod wide ratio, tci stall, performer rpm upper, 70mm bbk, pro m 60, 42#s, 3.73 7.5" posi, jba shorties, borla, upr x. 13.4 @ 104mph. cbaza, moates, tuned by decipha

Intake spacer and other upgrades

Reply #35
Quote from: TurboCoupe50;168002
It will, IF you were only increasing lift and none of the other parameters...


Yeah that's what I told my dad when he asked me, but I figured I'd ask and make sure.  So theoretically, I could just have someone grind me a stock HO cam with more lift.  But that'd be taking the long way around.

Intake spacer and other upgrades

Reply #36
Quote from: kingcars;168028
Yeah that's what I told my dad when he asked me, but I figured I'd ask and make sure.  So theoretically, I could just have someone grind me a stock HO cam with more lift.  But that'd be taking the long way around.


Yes, definately the long way and a complete waste of hard earned cash. That "custom" ground cam would cost good money and give next to nil performance.
 Save your money and invest in a set of tfs twisted wedge heads, rockers and pushrods. Turbocoupe50 is racing those with flat tops, so you know it'll work. Those tfs by themselves will bolt on, blow away anything you can do with a cam change or to those e7's. More horsepower, increased valve clearance, and lighter weight. Not often you get 3 benefits for the price of one. TFS all the way.  :evilgrin:  :evilgrin:
[SIGPIC][/SIGPIC]88 t-bird: 5.0ho, gt40y, crane 2031, fms 1.7, paxton@5#, aod wide ratio, tci stall, performer rpm upper, 70mm bbk, pro m 60, 42#s, 3.73 7.5" posi, jba shorties, borla, upr x. 13.4 @ 104mph. cbaza, moates, tuned by decipha

Intake spacer and other upgrades

Reply #37
Oh wow, all of that works with flat tops?  And they'd work fine with a stock cam and 1.7 rockers?

Intake spacer and other upgrades

Reply #38
Quote from: kingcars;168049
Oh wow, all of that works with flat tops?  And they'd work fine with a stock cam and 1.7 rockers?


Dude, let me tell you, I did not know this. A guy I know is a parts, man at a Ford dealer been there for years, has hot rod Mustangs etc. Figuire he knows his $hit. Well I know the SO is a dog, e6's are more of a flow choke than e7's, the motor is a dog even blown.
Anyhow, the engine needs heads, so I ask him what he thinks, and he says he has a good deal on gt-40y's. Will they work? he says 86 and up it will, no interference problems. Told him specificly an 88 t-bird with an SO. He shows me in the SVO book. Cool. I call SVO and ask a Mustang racer at the dealer. Nobody had done it so they did not know for certain, but everybody said "it should work". Ok so the car sits for awhile and I finally get off my lazy a$$ to get it done. I pull the head off and see no valve reliefs, $hit, uh-oh, I better check. I did the lift test pretty quick but IIRC it wasn't even close. When the piston was at tdc the valve was like less the .010" from  the piston. With the chain on I thought it might have even stopped rotating. No way I aint using these brand new heads and hose'n up the motor and heads. Big problem was I lost the reciept and the parts guy told me I was out. I didn't know about this board or hotrodding small block Fords. There were 3 different heads sold by Ford: gt-40x, gt-40y, gt-40z. The gt-40z's were the hottest, so I figuire the one in the middle like the alphabet cams. Come to find out it is the LOWEST horsepower of the three. I don't know if they're trying to trick you or what. I was pissed, :mad:  I couldn't use Ford's $hit with Fords parts. None work with flat tops. Ultimately, it was my own fault, why? because I didn't check or take advise from someone who was running the same combo. Later I find out that TFS have more power, work with flat tops and are just better all around than anything Ford puts out. I thought I was doing good by going with Ford parts. It was an expensive lesson I'll hope not to make again.

I appologize if this sounded like a rant, but it was a live and learn deal.
[SIGPIC][/SIGPIC]88 t-bird: 5.0ho, gt40y, crane 2031, fms 1.7, paxton@5#, aod wide ratio, tci stall, performer rpm upper, 70mm bbk, pro m 60, 42#s, 3.73 7.5" posi, jba shorties, borla, upr x. 13.4 @ 104mph. cbaza, moates, tuned by decipha

Intake spacer and other upgrades

Reply #39
Nah man that's great info.  The only problem now is that those heads are quite expensive.


Intake spacer and other upgrades

Reply #41
wow dude, that is pretty pricey. throw in another grand and a half and u can get a pretty good crate engine. the top end isnt as good as that kit. but then you'll know the bottom end is new and built stronger then your stock SO.


http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_756619_-1_10763
1988 Thunderbird sport
2004 Ford F150 Lariat
2008  Chevrolet Cobalt Sport
2007 Suzuki DR-Z400S dual sport/Supermoto
1988 Thunderbird LX - sold
1988 Mercury Cougar XR-7 with GST kit - gone

Intake spacer and other upgrades

Reply #42
Yeah that stuff is a bit outta my price range.

Intake spacer and other upgrades

Reply #43
Quote from: grutinator;168121
wow dude, that is pretty pricey. throw in another grand and a half and u can get a pretty good crate engine. the top end isnt as good as that kit. but then you'll know the bottom end is new and built stronger then your stock SO.


http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_756619_-1_10763


As long as youre not stupid, the bottom end of a standard 302 could last years under a top end kid like Trick Flows. Tom is running an 86 short block in his bird, with that top end kit, he has been for years, and he doesnt baby it by any means.
It's Gumby's fault.

Intake spacer and other upgrades

Reply #44
I have that setup as well. 

BTW I've personally seen a 91 Town Car block with stock rods and crank take 550 RWHP.
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!