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12-04-2012, 11:52 AM #1
any ford guys out there i need some help.
I recently picked up a 89 fox with a "built" motor. It runs great but kinda backfires around 5500 rpm out of the carb. Its not a severe backfire u can just see pressure out of the carb and it wont rev any higher im thinking valve float but i wanted to see if anyone else has any idea i dont know much about the motor it has a decent cam but dont know specs has roller rockers and arp head bolts.
Any input is appreciated not lookin to dump a bunch of money n this motor because i was do a sbc swap n the futureDustin Dillow-Tuned by Dillow's Tuning Solutions
95 Firebird Formula Cam, Bolt Ons, QP 9 Inch 3.50 Gear, Full UMI Rear Suspension, 3700lbs
7.86 at 86.20 mph 1.67 60ft, 7.16 at 99 mph 1.51 60 ft on .063 jet NX Shark Nozzle Single Fogger
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12-04-2012, 01:06 PM #2InActive Member
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If the heads are stock and your cam is over 480 lift, you are floating valves. If it has double springs or manley singles in it, they can usually handle 550 lift or higher with stock valves and guides. If your looking to rev it to 6k your gonna need heads to make any more power. The patriot SBF heads are under $900 and are fully assembled with good stuff. Do you know what push rods or lifters are in it? Ex stock length? Mark.
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12-04-2012, 01:07 PM #3"The Rock"
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Ahhh... thats my mustang buddy^^^
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12-04-2012, 01:08 PM #4
I have no idea im gonna pull the valve covers tonight i just thought it should rev past 5500 not that it needs to b turned that high just a thought lol
Dustin Dillow-Tuned by Dillow's Tuning Solutions
95 Firebird Formula Cam, Bolt Ons, QP 9 Inch 3.50 Gear, Full UMI Rear Suspension, 3700lbs
7.86 at 86.20 mph 1.67 60ft, 7.16 at 99 mph 1.51 60 ft on .063 jet NX Shark Nozzle Single Fogger
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12-04-2012, 01:23 PM #5InActive Member
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Well are the heads iron or aluminum? Maybe GT40p heads? Check em out, tell me what you got and ill tell you what they'll do or what needs to be done to achieve what you want. I dont see anyone building the block and not swapping the heads. The heads on the 302ho engines are the "cock blockers" so to speak lol.
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12-04-2012, 01:27 PM #6"The Rock"
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Our BIG MOMENT @ the 2012 LTXshootout
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1996 Camaro Z28: RIP 09/25/2016
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1985/1996GS clone: SOLD
1996 Impala SS H/C, LT, with true dual exhaust, 4.10s, lowered, with CPT trans, many cosmetic mods, and a whole lot more to come...
2002 Caddilac EscaladeL CAI, lowered, 6.0 , AWD..
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12-04-2012, 01:31 PM #7MAD ABOUT LTX's
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GT40 heads are marked with a "ZZ" on them, I had a set on my 90 that were extrude honed and running an old school B303 cam and a few other things and my car was still sideways in 3rd gear back in the day.
If you don't stand behind our MIlitary then feel free to stand in front of them. <---- This is my oldest son (PROUD DAD HERE) Mike (just plain mad) Madman337 1993 Camaro Z/28 A4 all stock other than a muffler and LCAs @292K+ miles. 2006 Chevrolet Avalanche. 1970 Pontiac Firebird. 1972 Camaro, 1994 Corvette, 17 Fusion Sport AWD V6 Twin Turbo
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12-04-2012, 01:47 PM #8InActive Member
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Yea def, the P heads are at least 50% better than stock. Def the cheapest way to make power on a budget.
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12-04-2012, 02:56 PM #9
Heads r cast iron ill check em out when i get home
Dustin Dillow-Tuned by Dillow's Tuning Solutions
95 Firebird Formula Cam, Bolt Ons, QP 9 Inch 3.50 Gear, Full UMI Rear Suspension, 3700lbs
7.86 at 86.20 mph 1.67 60ft, 7.16 at 99 mph 1.51 60 ft on .063 jet NX Shark Nozzle Single Fogger
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12-04-2012, 06:43 PM #10InActive Member
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Ok. Let us know. What size and brand carb is on it? And whats the displacement of the engine?
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