ford 460 problems

[navyman_98_99]

ok so i have a 78 glastron 23.5ft jet boat with a ford 460 that has been built like crazy and at high rpms like when the secondaries kick in it back fires thru the carb. the specs of the motor are... ford 460 +030, edelbrock 750, weiand stealth cj intake, speed pro forged dished pistons +22.00cc dove heads ported polished with 2.25 stainless and 1.76 stainless valves, comp cams bee hive springs, scorpion adjustable roller rockers, comp cams 7/16 guide plates and comp cams 7/16 pushrods. comp cams marine xtreme xm288h, stock crank, eagle h beam rods. high output oil pump, holley blue fuel pump and a truck oil pan. accell super coil and pertronix electronic ignition module. base timing is set to 6btdc as the cam spec card says. I always run 91 octain. Im wondering if I dont have enough carb. I do have the carb running pretty rich at idle but cant really tell when the secondaries kick in??? it has always done this since i got the motor from the engine builder so i just try to stay about 4500rpms and no pop thru the carb. also the boat has a brand new jet pump with a aggressor "A" impeller and shoulder wear ring because I thought the pump was slipping. when i give it some juice on the throttle it still does it it takes the rpm gauge to about 6500 and then backs down to about 6000 steady. it did that before and after the new berkeley pump. so i try to stay out of the throttle and just keep it steady at 4500 rpm untill i figure out the popping and studdering at higher then 4500 rpm or when the secondaries kick in. any help is appreciated. thanks in advance.

[Duane HTP]

Give me a call. I can help you. Too much to type. 417-858-8616
Duane HTP

[navyman_98_99]

ok thanks i just got home from work let me know a good time to call. thanks Mike

[Duane HTP]

I'm at the shop 8:00 am-12:00. 1:00 pm-5:00pm. CST

Usually have my phone turned to my cell in the early evenings.

Duane HTP

[SS-201]

Backfireing thru the carb usually means problems on the intake side, ex. intake valve, bent pushrod, rocker, cam, on the intake side of the engine

[fkboatman]

Lean or its a timing issue.

[navyman_98_99]

hummm? i just noticed this weekend water bubbling out of my waterlogs where they mate to the heads??? maybe cracked waterlogs? all I know is my spark plugs are spotless like brand new after 10 trips to the lake. maybe a lean condition from water? they r berkeley waterlogs but have new gaskets on the riser.

[SS-201]

460 Fords are known for water leaking from the water passages from intake manifold to block.
retorque get hot retorque again. Before you condem the exhaust manifold be sure that in fact they are leaking, expensive changes, been thru that with my 460.

[thompy]

how about a few pics of your boat, plan on looking for one next year