Engine miss and low power rebuilt 350 Chevy

[Yav8]

Please do tell us what that little 350 has? One of the easyist one I have done is a complete vortec motor with just a freshen or the rings rods mains and the addition of one of GM cams. The cam came from a marine motor and is the same one used in the basic GM 383 build. Last three numbers are 395 and has a light blue paint mark near the end of the shaft. This and a set of 1.6 rockers and you have what GM call the Ram Jet 350. You can use the stock valve springs with this cam and rockers with no problem. I have this one in my weekly bracket truck, 4425lb with a th350 and a 3.42 gear. Mid to uppers 14s at 93mph if the wind isn't blowing to hard. I do have it running with a carb and a HEI to make it simple. GM says it should make 350hp and 400tq and it is one heck of a tow vehicle with all that TQ. I did all the work my self and with out the intake and carb I have a little over $280 in the complete motor. If you really want more then get the GM HOT CAM and upgrade the valve springs.

 

[pontiacgp]

was the block zero decked?

 

[Pontiac455]

Sounds to me there is an internal leak in the lifter valley. If the heads were planed too much it would interfere with the sealing between the intake and the heads. That being said did u check yer push rod length? Planing the heads also changes the length.

 

[64nailhead]

You should narrow down the miss to what cylinder it is. Compression test as mentioned previously and/or the hillbilly cut out test by pulling a plug wire while it's running to determine which cylinder is creating the misfire. IMO, a leaking intake gasket is not going to create a cyclical miss unless the leak is enormous. But you should be able to identify that with a manifold vacuum gauge that jumps around severely when the miss occurs.

 

[Judge Mills]

I vote yank the heads. If you changed the intake and there is still a problem, I'm guessing something went wrong on the machining.

 

[lilbowtie]

I already changed intake manifolds and its doing the same thing. The heads were a craigslist buy and seller only knew they were fresh from machine shop. I was told nothing about any milling or surfacing which obviously has been done

The only reason I told you to make the check if the heads have been milled it doesn't matter what manifold you use it won't be right.

 

[HAFROD]

The only reason I told you to make the check if the heads have been milled it doesn't matter what manifold you use it won't be right.

I changed intakes because the air gap is an 1/8 off of one end and thought it was my issue.

 

[HAFROD]

Not sure how to check if heads have been milled with them bolted on. I'm pretty much tired of messing with these 882s. I'm going to put on my Edelbrock aluminum ones but going to remove engine and thoroughly check bearings and cam/lifters. Got to buy about $500 worth of sh*t to put it back together (head bolts, head gaskets, push rods, zinc oil, cam/lifters, one piece Felpro pan gasket, and engine gaskets). Going to put back in the Goodwrench 350 this weekend.