Thread: 2/4bbl/blown slantsix

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pay attention to what tech. is trying to tell you . your fuel pressure is ok at the start of the run but 3/4 in the pressure is not holding up .

i did not mean to sound like i was not listening,i am just trying to give you all the info that i have learned this race season and try to cover all the possible bases so next season i mite be closer to the right tune up for this combo,thanks

i said this??????????????????

Originally posted by lt1s10
and that would be the reason you're not blowing head gaskets,

denny i think its more like head gasket not plural

Originally posted by gassersrule_196
denny i think its more like head gasket not plural

i meant head "gaskets" gassersrule_196, i understood that he had done this more than one time, and if he had went threw the 1/8 of the mile with no fuel prussure, he would have blown a gasket everytime. two or more "runs" = two or more head "gaskets". how did denny get into this? i believe you've been sniffing to much racing fuel.

terrylittlejohn, i ran blowers a lot of years and had about every problem you can think of, but one thing i just thought about and was one of the hardest things to find is i had a float in a 750 holley that would sink under load and do the same thing yours is doing. everybody told me there was no way a 471 blower would sink a float, so i didnt do anything about it untill there was nothing else to do. at the time they had a blower none sinkable float. that fixed mine. you're not playing out of fuel you are flooding it, and as soon as you let up the purssure in the carb. decrease and the float will come back up. if you have cork floats you need to change them anyway.

thanks for that tip, but i only have brass or plasitic floats, can you explain what a cork float is?

Originally posted by terrylittlejohn
thanks for that tip, but i only have brass or plasitic floots, can you explain what a cork floot is?

it looks like black styrofoam and you can scratch it with your finger. then you have a harder plasitic and the brass, im not sure what i had or what i ended up with, but the brass ones would be the best ones i would think. go over to blower serv. and see what they have. they was the ones that told me i didnt need new floats and 2 mos. later 6 or 7 trips to the drag strip and falling on my face i bought them anyway and fixed the car. i wouldnt run nothing but the brass. ill check on it to ,if i find out anything ill let you know.

thanks i need a little help, thats what my summer was like,either jetting through the roof or taking all the timing out and seeing the same results, hopfully some of these ideas will cover my problem.

Originally posted by terrylittlejohn
thanks i need a little help, thats what my summer was like,either jetting through the roof or taking all the timing out and seeing the same results, hopfully some of these ideas will cover my problem.

you are lucky, i started off lean and have 25 head gaskets and 6 or 7 sets of pistons to show for it. that how i know you ant running lean.

you said you loss a head gasket and all the ex valves if you are not lean then what are you? and i have afbs edelbrocks and have been lean but did not hurt any thing i have not see the floats sink from a blower?? how dose this happen?? but from to much fuel psi and have done it with holleys and afbs - edelbrocks

boy is it that dam hard to put a fuel psi gauge on this ??to find out what you have for psi ?? do what you want . i think you should start here and a fuel pump that is rated at 72 feeding two carbs and four float bowls. this is not going to cut it .and you may not have it running lean but when you get the bog out and get it to run a full pass it will run out of fuel .

if you think i can help you terrylittlejohn, you can pm me. pat seem to have all the answers though. pat just because you never sank a float dont mean it cant be done. if you dont know what make them sink im not gonna tell you. ive had a lot of them sink on reg. motors, so i know they will sink on a blower motor.

yes ,at the first few times at the track when the car did not feel right, witch was usually high gear full throtle, i would lift and when i checked the plugs you could see porislen and electrode damage.after jetting up till you could breath in the car with no change and still finding plug damage i tried timing, after reducing it to 15deg total, witch was 2deg retarded at idle,i still had the same outcome.so the last run i had on the last weekend,i threw all causion to the wind and stayed in it, when i shut the car off it would not restart.after i got home and pulled the engine i found the head gasket burnt between1&2,5&6 and #5ex burnt also 3 of the piston had cracks in the skirts.all i can say in first & second the car never felt or perform better, so whether i am over carbed, under fuel pump or pressered i will have to see after i put all these great suggestion to work,so keep them coming, thanks

you should have added all that the first time terrylittlejohn thats a dead give away its lean. i didnt get the blown head gaskets out of the first post. falling on its face and blowing up is a lot dif. from falling on its face and not blowing up.