LUVTruck.com

i have a 75 luv with a 231 v6.
the problem i have is that when you step on gas lightly and knd of roll into it, it gets up in rpm's just fine but when i want to break loose at a stoplight and stomp on it, itgoes but does alot of popping and missing,
i have put a new edelbrock 650 on it, double checked all vacuum lines, checked timing all is good, i am at a loss, when i do end up putting a v8 in it i want to sell this motor so i want it in good running order until then.

any help is appreciated

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zyanug
75 luv stepside... Work in progress
76 fleetside 350hp 1968 327cu
"No replacement for displacement!"
___/__l____
[_@l__l__@_]***

Check plugs and wires as they will cause a miss when you put the motor under a heavy sudden load when bad.This condition will be even worse when you add a extra load like the extra fuel from a bigger carb.Also you may want to adv. the timing a couple of deg. as well.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s

ok i now realize that i havent explained my motor too well

i dont know what exactly has been done to it cause it was that way when i bought it, but in my experience i would say that it definately has a cam upgrade, and had some work done to the heads, so its hard to say if the carb is too much. i have tried to adjust the timing advanced and retarded, no good

the only other thing i can think of is maybe the dist is bad

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zyanug
75 luv stepside... Work in progress
76 fleetside 350hp 1968 327cu
"No replacement for displacement!"
___/__l____
[_@l__l__@_]***

You may also want to check the dist cap. Sometimes they carbon track inside by the terminals. You can see a little line that looks like a crack.

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Life is a DRAG RACE!!!
I like my Luv WILD!!!

Sometimes too much to drink isn't enough!!
Kinky is using a feather. Perverted is using the whole chicken.
http://www.wildluvracing.com

Just reread your post i also think you have to much carb for the size of your motor.You should have the 500 cfm carb.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s

Carb is fine.......

i bet i know whats wrong, same that happens to all of these V6s.......

check your compression on cyl # 3. or pull the valve cover and measure the movement of the rockers.

I bet you money #3 exhaust lobe is going flat.

Buicks DO NOT like flat tappets. period.

UNLESS........ you like adding copious amounts of ZDDP to your oil.

I can however, show you how to upgrade to rollers for cheap! (well cheap in buick terms)

A.j.

P.S. oh yea, did I mention i was a BOP Nazi?

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http://www.youtube.com/watch?v=ykgDNjeTa0g

Yup any kind of more then stock spring pressure will get the cam in Buick V6's as well as the bigger ones. I have been real lucky so far but as the oil has changed now it's time to take far more precautions on lube and parts. A roller upgrade would be the answer but real costly on my motor.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s

I didnt know that V8 buicks suffer from this problem as well......

now I do know that the valley is open between the lifters on the V8s, but if we could manufactor a spider of some sorts, then a factory style roller sytem could be used - that would be a third of the cost of the Comp retrofit system. The only drawback is its limited on total lift.... good for a mild engine though.....

A.j.

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http://www.youtube.com/watch?v=ykgDNjeTa0g

TA builds a support for the 455s that works for roller retrofit but it is costly though still less then a broke motor due to a lifter bore breaking off.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s

do explain the roller set up please

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zyanug
75 luv stepside... Work in progress
76 fleetside 350hp 1968 327cu
"No replacement for displacement!"
___/__l____
[_@l__l__@_]***

Well its an interesting system,

it uses the spider assembly from the later series 2 3800 buick engines, and the rollers and dogbones from a 60* V6. Now you would think that you could just swap everything from the later 3800 to the early 3.8/4.1 but the lifters are of a different height, and the oiling is incorrect. The 60* v6 lifters have improved oiling and are the correct height. The hard part, is that the block has to be drilled for 2 studs, these are what retain the spider bracket. next the block has to be relieved just a little bit around the lifters so that the dog bone can sit flat. other than that its just a matter of assembling it all together and getting custom pushrods. Its actually very cheep to set up - as most parts can be found in the junk yard. The expensive part is the roller cam, and the custom pushrods.

The Bad side of the system, being that it is a factory roller system that uses a spider and bones, it is limited to the amount of lift that the cam can have, so it kinda keeps it on the mellow side. HOWEVER, most factory buick GN cams were mellow anyways, but they were designed to work very well with the turbo... it has been proven that a stock cam can take you easily into the 11s and a mild aftermarket has seen the 10s multiple times.

I came about all of this in my quest for a better roller lifter........ ive been fighting for about 3 years now with the crappy Comps, Cranes and Iskys, im sorry... but they just CANNOT make a proper lifter for a Buick V6. There always way too much like a SBC lifter and the end result is a very noisey valvetrain that tends to break valvesprings. A bunch of us have been pushing TA performance to start selling the Morel brand lifters as a few of us have tested them and are very happy with the quality.... but at 400 bucks for a set.... its pricey.

I have pics to show the conversion, but i cant post them while im at work... so I will try and get them up tonight. or should I just do a whole post on the conversion? what do you guys think?

A.j.

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http://www.youtube.com/watch?v=ykgDNjeTa0g

All right it's nice to see somebody has done there home work and please post the whole conversion for others to follow.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s

Ok I can show the whole conversion, what section of the forum should I post this in?

A.j.

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http://www.youtube.com/watch?v=ykgDNjeTa0g