351cleveland 4v lack of power help please
04-25-2008, 11:21 PM
#1
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Join Date: Jun 2007
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Posts: 31
351cleveland 4v lack of power help please
hi guys,
i just built a 351 cleveland 4v heads. has 10.0 to 1 speed pro, isky solid 530 lift and 278 duration cam, 1.75 roller rockers, screw in studs, manley valves, dual springs, new water oil and fuel pump, milodon 9 quart oil pan, 4150 double pump holley, pertronics coil and chip in distributor.
this motor is going in my 1971 mach 1, all part are new and its a 4 speed manuel
so heres the problem, broke in the motor at 2,000 rpms for 20 mins. i have about 20 miles on motor. got fuel and spark, timing at 12 idel and 37 max. around 3,000 the motor backfires. the motor hesates when yourev it and theres no power at all.pulled the plugs and all dry black carbon, drove about 4 to 5 miles and used up 1\4 of a tank about 4 gallons
WHATS wrong with my mach1. any thoughts are appreciated
i just built a 351 cleveland 4v heads. has 10.0 to 1 speed pro, isky solid 530 lift and 278 duration cam, 1.75 roller rockers, screw in studs, manley valves, dual springs, new water oil and fuel pump, milodon 9 quart oil pan, 4150 double pump holley, pertronics coil and chip in distributor.
this motor is going in my 1971 mach 1, all part are new and its a 4 speed manuel
so heres the problem, broke in the motor at 2,000 rpms for 20 mins. i have about 20 miles on motor. got fuel and spark, timing at 12 idel and 37 max. around 3,000 the motor backfires. the motor hesates when yourev it and theres no power at all.pulled the plugs and all dry black carbon, drove about 4 to 5 miles and used up 1\4 of a tank about 4 gallons
WHATS wrong with my mach1. any thoughts are appreciated
04-26-2008, 05:11 AM
#2
1st Gear Member
Join Date: Apr 2008
Location:
Posts: 98
RE: 351cleveland 4v lack of power help please
ORIGINAL: MUSTANG ROBERT
hi guys,
i just built a 351 cleveland 4v heads. has 10.0 to 1 speed pro, isky solid 530 lift and 278 duration cam, 1.75 roller rockers, screw in studs, manley valves, dual springs, new water oil and fuel pump, milodon 9 quart oil pan, 4150 double pump holley, pertronics coil and chip in distributor.
this motor is going in my 1971 mach 1, all part are new and its a 4 speed manuel
so heres the problem, broke in the motor at 2,000 rpms for 20 mins. i have about 20 miles on motor. got fuel and spark, timing at 12 idel and 37 max. around 3,000 the motor backfires. the motor hesates when yourev it and theres no power at all.pulled the plugs and all dry black carbon, drove about 4 to 5 miles and used up 1\4 of a tank about 4 gallons
WHATS wrong with my mach1. any thoughts are appreciated
hi guys,
i just built a 351 cleveland 4v heads. has 10.0 to 1 speed pro, isky solid 530 lift and 278 duration cam, 1.75 roller rockers, screw in studs, manley valves, dual springs, new water oil and fuel pump, milodon 9 quart oil pan, 4150 double pump holley, pertronics coil and chip in distributor.
this motor is going in my 1971 mach 1, all part are new and its a 4 speed manuel
so heres the problem, broke in the motor at 2,000 rpms for 20 mins. i have about 20 miles on motor. got fuel and spark, timing at 12 idel and 37 max. around 3,000 the motor backfires. the motor hesates when yourev it and theres no power at all.pulled the plugs and all dry black carbon, drove about 4 to 5 miles and used up 1\4 of a tank about 4 gallons
WHATS wrong with my mach1. any thoughts are appreciated
If you fuel pressure is okay, it could be a float adjustment.
Or a piece of crap stuck in the needle valve(very common on new installs).
You do have a fuel filter right.
04-28-2008, 04:36 PM
#4
Thread Starter
Join Date: Jun 2007
Location:
Posts: 31
RE: 351cleveland 4v lack of power help please
yeah i do have a filter. the carb is 4150 hp series 750 brand new out of the box only ajusted idle. i planned to put a inline pressure gauge but i forgot i had it and already cut and installed my steal braided lines.
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