Thread: gm sent wrong engine??

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can anyone tell me if this is right motor?? casting# on block is 10066036. the number on the paper tag is 12499529. i know that this is a target motor with bigger cam, but the motor does not run like 290 horse motor!!!! i think gm sent me a target motor(249hrse) and labeled it a 290 horse motor. how can i tell?? it doesnt lope at all, has 15 in. of vac and wont time right(shows more timing than it runs like,shows alot of timing but u can tell its lugging) takes more timing too run right, and balancer is right on tdc, checked it. any suggestions????? do you think i need too put a adj timing gear because i was told that with this 327 cam (450-460 lift) back in the day that gm had too retard it 30 deg because people would here it run at the dealership and hear it lope and they wouldnt buy because they thought something was wrong with it so gm recalled them and retarded them to take the lope out of it. so is this motor 30deg slow, do i need to put offset cam gear too fix it or did i just get a motor that i cant time because no one can figure it out!! numbers on front pad by the head are imo713-7h04, if that helps at all.

If the cam was 30 degrees off, the engine wouldn't run at all....

Thats what im saying . if i put 34deg timing in it it lugs(sounds too slow) ive had three diff old school racers listen to it they all say the same thing theres no way that motor has that much total timing in it because if it did it wouldnt even start and it sounds way too slow!! they all do the same thing time it buy ear and vac gauge. then put light on it and total is thru the roof!! something isnt right ive checked everythig and fixed spit and hesitation. I CANT GET TIMING TOO READ RIGHT. im thinking cam gear has to be off a tooth or something, it still doesnt run like a 290 hrse motor its way slow, no matter who looks at it(experienced mech or me) im frustrated again , i really am starting too think ive got a plain ole 249hrse target motor, because it runs like it!!!!

Well ............at least the delivery people didn't break it in half.

Well ............at least the delivery people didn't break it in half.

Now that's funny.....

I'd pull the timing cover off and see if it's all lined up correctly.

ill try that because im no mechanic(obviously), but ive been around enough hotrods to know something isnt right. thanks guys.

Do you have the right timing tag on it? There is a difference between a 305 and a 350, could you have the wrong tag on it? Is the tag at about one aclock or about two?

Did you check the centrifugal advance in your distributor to see that it asn't sticking ? Be easier to pull the distributor cap and see if the rotor snaps back after grabbing the rotor and twisting the advance forward.

It does happen that the the cetrifugal advance sticks, seizes or is not working right.

I just did a search and that part number comes up to a 290hp 350. I see no intake on it. If the intake was not properly installed you could have a vacuum leak....

Originally Posted by bigdude

Do you have the right timing tag on it? There is a difference between a 305 and a 350, could you have the wrong tag on it? Is the tag at about one aclock or about two?

yeah they sent two tabs one for 7" and one for8" im running 6.75 so i put the 7" tab on it it is at 2-0clock. and also southerner i have checked the adv weights (first thing i did) and they are moving freely and canister is working(suck on adv hose and it idles up).

Originally Posted by ceh383

I just did a search and that part number comes up to a 290hp 350. I see no intake on it. If the intake was not properly installed you could have a vacuum leak....

wich # did you pull up because i put in 12499529(gm tag part#) and it is 290/350 but if you put in 10066036(casting#) it shows 249/350.

Here is an easy way to check your timing. Bring no 1 up to TDC firing stroke using a piston stop and check where your timing mark is on the balancer. If you have a dial indicator you can check your cam timing by reading of the intake valve when it just starts to open. The dial guage method will only work if you have a fully degreed balacer or timing mark stick on tape and the cam specs. This way sure beats dumping the coolant, pulling the water pump, and front cover and replacing seals and gaskets if the cam timing checks out okay.

I used the tag number because the same block can be used for several different motor combinations.
I did look a little further and found THIS
Look at the specs...It shows a different block casting number for the 290/350.

It may not be what you ordered.....or it could be a typo......

yeah i see that im gonna google the diff block number and see what it pulls up. THANKS 383 YOU MAY HAVE JUST ANSWERED A 1700$$ QUESTION ILL LET YA KNOW SHORTLY

Well When I Pull Up #10066036 It Shows Target Motor, When I Pull Up 10066034 It Pulls Up 290/350. Same When I Pull Up 12499529=290/350. Hell I Dont Know But Ill Find Out Tommorow, If They Sent Me Target Motor Im Gonna Be So Pissed!!!!! How Much Trouble Do You Think Itll Be To Get Them Too Replaceit With The Correct Motor??????