LUVTruck.com

okay, bear with me for another thread.

alright. to start off im gonna tell everyone what parts i have.

right now in the truck is a 1984 impulse engine with about 90k on it. it has stock flattop pistons, and thats about it. it also has a stock impulse G200 head. nothin special about it. it just goes with the motor.

in the garage is a 1977 G180 head with 8 bent valves. it has the stock valvetrain in it also. the head is going to get 8 new valves and probably guides also. might even get ported.

okay, now the questions about the 1977 head.

are the valves in it smaller than the G200 head?
can lager valves be put in this head?
will valvetrain parts like rockers and rocker tubes interchange from the G200 head to the G180?

what id like to do is put the rebuilt g180 head on the rebuilt impulse G200 bottom end, and have a little compression motor. id also like to run the rockers and tubes from the G200 head on the G180 head. the G180 rockers look alot weaker than the G200 pieces. id also like to be able to rev this engine to at least 6000rpms safley. now thats going to to be more cam right there.

now questions about the assembly of the motor.

are there any problems i might run into with the timing components? ie: ending up with too much or not enough slack in the timing chain.

i already know that the coolant passages are going to be fine. the motor that was in the pup when i got it was a G180/200 hybrid. its had a G180 bottom end with a G200 head. it ran fine and cooled fine also. i also have a G180/200 in my luv. runs fine, cools fine. not worried about that.

also. what kind of compression will i be looking at when i get this together? the stock impulse motor has 9.2:1 compression. a G200 with dish pistons has 8:1. a G180 head on a non-impulse G200 makes around 10:1 right? so on a 9.2:1 bottom end, i should be lookin at about 11-11.5:1 comp?

if it does turn out to be a high compression number like that, what kind of cam specs am i goin to be lookin at?

id like to finally know the ins an outs of the hybrid G seires engine. theres been alot of i dont knows about them on here, so id like to finally get all the info straightened out and have some useful info that could be used later.

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

I want to have the same setup for my '78 but my biggest worry is having more compression then the stock rods can handle. I think it would be okay for normal street driving but too many rpms might kill it.

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1975 V8 Luv
1980 Bagged Luv

your compression his not going to ruin your rods and bottom end all your compression is going to do is give you more power but on the flip side you will have to run a diluted mixture of 91 and 110 octane i would say you need around a 3/4 to one ratio on the fuel.....i work for johnny demasters racing engines here in joplin and i called and asked him about the compression stuff and that was his input on it

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Arquing with me is like running in the special olympics, even if you win your still retarded.

11.5:1 just seems like alot to me on the stock rods, thats all.

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1975 V8 Luv
1980 Bagged Luv

i dont think there will be any problems with the stock bottom end. ive read alot of turbo G series buildup threads, and they run stock bottom ends with crazy high boost settings and they hold up fine. the bottom ends in these engines were derived from diesel engines, so they are plenty strong. that and the rods are huge in these motors.

the only thing i can see going wrong is blowin a hole though a stock cast pistons from the added heat from the compression. but i plan putting a better radiator in the truck anyways.

and i dont think ill have to run a mixed fuel in this also. itll run premium all the time, and it will be tuned on premium. i might put some race fuel in it for the track, but i doubt thatll happen.

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

Ok cool cause this is what I want to do also.

Which truck are you going to do this to?

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1975 V8 Luv
1980 Bagged Luv

well the motor can go in either truck, but it will be in the pup first. if i had the dough to build this motor and the 355, the 4 banger would go in the luv, and the v8 would end up in the pup. but with the way gas is spendy, the v8 isnt gonna happen.

so with building this engine, ill only be in it like 500 bux at the most. i already have the engine parts. i just need the $210 engine kit, and the reground cam.

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

okay, ive come up with the grind for the cam.

im thinkin its going to be a 272*intake 272*exhaust .420lift cam. im still not sure on the LSA still. the longer duration will bleed off a little of the cylinder pressure, and will give it a very nice lope. im also bein very conservative on the lift right now since i dont know if theres going to be clearance issues with the valves and pistons with the G180 head. when i get the motor apart and set the other head on the block, then i can find out what my max lift can be.

im going to have delta cams regrind one of my cores that i have. they should be able to help me out with the LSA and any other things i need.

i think with that cam, im also going to have to get a new set of valve springs. im not sure if delta would have anything for my application, but i could ask. the new springs would also help me be able spin this thing up to 6000-6500 no problem.

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."