Okay got a question about gmc motor. I am getting offered a 228 gmc motor for 250 obo. Got couple questions though. Is it full presurised oil system. Is it a good motor? How good do they run. Is it reliable. Any help would be great. It is close to me and my son is interested in it but before he jumps on it i would like some info on it. Could you help? Thanks in advance.
Full pressure yes. Good motor, sure. Reliable yes. Popular, no. The 228 and 248 are the same basic design as the 270 and 302, but not nearly as popular.
Yep full pressure. Power 'bout the same as a 235 Chevy, more reliable I would say. Parts are more than what 235 bits would be. Will fit where a Chevy 6 would ,but are about 2 inches longer.
thanks. Is there anything i should know about this engine in particular? any main problems all of them have or??
I dont know any real problems but they are the heavy duty version of chevy 6,s of that era. Back in the day most of the cars n truc usually all had different engines. One step up from Chevy was the GMC. And it is built like a brick ---- house compared to Chevy. It had forged rods , pistons, crank, good oiling, just a real tuff engine. The only thing about the 228 was it was the smaller version in cubic inches from the 270, 292, 302, versions. The heads were like most of the old time engines simple and practical for what they were designed to do.The heads werent that great but most those heads didnt breath too good , but they can be ported. Like if you built up a chevy you would need to beef up pistons, rods, oiling, etc the GMC you dont. And if you ran a blower that engine will take it. and you wudnt need any more cubic inches. Its a good solid engine.
For the most part no one wants a 228 other than some one restoring an original truck.The 270 and especially the 302 are way more popular. The Chevy 235-261 has forged rods and crank.The 235 rods are adequate up to near 180 hp and 5000 rpm.The 261 rods are beefier and can stand more power.The sturdier GMC rods have larger floating pins .In the old days Chevy builders used the GMC rods for racing . Comparing a GMC and Chevy 235 crankshaft,you'll see they look about the same,rod and main journal diameters are identical,both have 4 main bearings,the Chevy 235 has slightly wider bearings.The flywheel bolts are different,the 235 has six 7/16 inch bolts,the GMC 4 or 6 half inch bolts depending on the year.302 GMC's all have 6 bolt cranks I believe.The GMC crank and block is stronger and good for just about any power the engine can make.The GMC engine at 580 lbs is a little lighter than the 235-261 Chevy.The GMC has about 4 different heads ,the big port 270 and D shaped 302 head being the best and far better than a Chevy.
Most of them have Zollinger pop up forged pistons. I have owned several they are very good engines. OldWolf
considering the cost vs. the displacement, and that it cost as much to rebuild a 228 as it does a 302, I think I would p*** on it for something a bit bigger. If it is a solid runner, and you're not looking to soup it up, then it is probably a good buy.
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