Engine stalls when revving
10-20-2015, 09:12 PM
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Join Date: May 2015
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Engine stalls when revving
Recently got back my sbf from machine shop , had it stroked to 347
Same time I changed heads, cam, tconverter
Re assembled the components , engine fired immediately broke in the cam
And every time I rev the engine 2500rpm + it bogs down then Stalls
I've replaced wires coil and even the dizzy
I chanced springs to bring timing on earlier
I've changed the fuel pump, I have a regulator and gauge showing its working
I'm still playing with the timing, as I'd like to get smaller bushings for my msd mech advance
I have not got a vac reading on it yet, that's my next step, but I have ensured no leaks
What do I look for next? I'm f*#%king baffled
Here's my build so far
Thanks for the help, appreciated
>>>>>>>>> 23 T Bucket 2000lbs
>>>>>>>>> 1968 Ford 302
>>>>>>>>> Bore .030 stroked 3.4 = 347ci
>>>>>> Probe industries Forged Flat top 2618 aluminum Pistons 10.6:1 (475grams)
>>>>>> Scat Crank 9000 material
>>>>>> Forged Scat 4304 I beam Rods 5.4length with ARP cap screws
>>>>>> Pro Street Dampener & SFI approved 157 tooth flex plate
>>>>>> *4 deg cam advance
>>>>>>> Comp cam # 35-246-3
>>>>>>> Duration at .50 is 230/236
>>>>>>> 110 lobe separation
>>>>>>> .523/.523 lift
>>>>>>> Hydraulic flat tappet
>>>>>>>>> 180cc alum SBF heads 60cc
>>>>>>> 2.02 intake valves
>>>>>>> 1.06 exhaust valve
>>>>>>> Springs Seat pressure: 132 lbs. @ 1.750 inch,
Open Pressure: 293 lbs. @ 1.250 inch
O.D.: 1.430 inch, I.D.: 0.697 inch
Dual valve springs with damper
Approximately .540 inch max lift at recommended installed height
>>>> 7/16 push rods
>>>> 1.6 aluminum roller rockers
>>>>>>>>> x4 duel IDF Webber Carbs,
MSD Pro Billet Dizzy, Mallory Coil
>>>>>>>>>21* Mechanical Timing, ? Total Timing Advance, All timing in at 2500rpm
(X1 light blue spring, X1 light silver spring)
110gph electric fuel pump
>>>>>>>>> Trans 1968 C4, shifts @ xxx Rpm
>>>>>>>>> Stage 2 shift Kit , w/extra clutch & A servo
>>>>>>>>> 10" 2800 -3500 Stall TCS bracket master Converter
>>>>>>>>> Rear End 68 Jag XKE
>>>>>>>>> 3.33 Gears
>>>>>>>>> Limited Slip
>>>>>>>>> Independent Suspension
>>>>> 1 5/8 primary tube w.3.5" collector Sanderson headers with Supertrapp adjustable exhaust
>>>>>>>>> Tires 31x18.5x15 LT Slicks
Same time I changed heads, cam, tconverter
Re assembled the components , engine fired immediately broke in the cam
And every time I rev the engine 2500rpm + it bogs down then Stalls
I've replaced wires coil and even the dizzy
I chanced springs to bring timing on earlier
I've changed the fuel pump, I have a regulator and gauge showing its working
I'm still playing with the timing, as I'd like to get smaller bushings for my msd mech advance
I have not got a vac reading on it yet, that's my next step, but I have ensured no leaks
What do I look for next? I'm f*#%king baffled
Here's my build so far
Thanks for the help, appreciated
>>>>>>>>> 23 T Bucket 2000lbs
>>>>>>>>> 1968 Ford 302
>>>>>>>>> Bore .030 stroked 3.4 = 347ci
>>>>>> Probe industries Forged Flat top 2618 aluminum Pistons 10.6:1 (475grams)
>>>>>> Scat Crank 9000 material
>>>>>> Forged Scat 4304 I beam Rods 5.4length with ARP cap screws
>>>>>> Pro Street Dampener & SFI approved 157 tooth flex plate
>>>>>> *4 deg cam advance
>>>>>>> Comp cam # 35-246-3
>>>>>>> Duration at .50 is 230/236
>>>>>>> 110 lobe separation
>>>>>>> .523/.523 lift
>>>>>>> Hydraulic flat tappet
>>>>>>>>> 180cc alum SBF heads 60cc
>>>>>>> 2.02 intake valves
>>>>>>> 1.06 exhaust valve
>>>>>>> Springs Seat pressure: 132 lbs. @ 1.750 inch,
Open Pressure: 293 lbs. @ 1.250 inch
O.D.: 1.430 inch, I.D.: 0.697 inch
Dual valve springs with damper
Approximately .540 inch max lift at recommended installed height
>>>> 7/16 push rods
>>>> 1.6 aluminum roller rockers
>>>>>>>>> x4 duel IDF Webber Carbs,
MSD Pro Billet Dizzy, Mallory Coil
>>>>>>>>>21* Mechanical Timing, ? Total Timing Advance, All timing in at 2500rpm
(X1 light blue spring, X1 light silver spring)
110gph electric fuel pump
>>>>>>>>> Trans 1968 C4, shifts @ xxx Rpm
>>>>>>>>> Stage 2 shift Kit , w/extra clutch & A servo
>>>>>>>>> 10" 2800 -3500 Stall TCS bracket master Converter
>>>>>>>>> Rear End 68 Jag XKE
>>>>>>>>> 3.33 Gears
>>>>>>>>> Limited Slip
>>>>>>>>> Independent Suspension
>>>>> 1 5/8 primary tube w.3.5" collector Sanderson headers with Supertrapp adjustable exhaust
>>>>>>>>> Tires 31x18.5x15 LT Slicks
