doitnow Posted February 11, 2009 Share Posted February 11, 2009 I am trying to build the 3800 engine. How much can you take off the heads to increase compression?Old Guy Link to comment Share on other sites More sharing options...
Tinker Posted February 11, 2009 Share Posted February 11, 2009 Old Guy, welcome to the forum. Your question might be better answered on this forum: BUICK-PERFORMANCE/MODIFIED although, you might get a few answers from the people here also. Link to comment Share on other sites More sharing options...
2seater Posted February 12, 2009 Share Posted February 12, 2009 I don't know about shaving the heads, except to clean them up if necessary, but you can install vin L pistons in the vin C engine to gain about .5 compression ratio. The aftermarket pistons, I used Silvolite, are about .050" higher compression height. I am a little concerned that if the heads are shaved a bunch, the non-adjustable rockers may cause a valve geometry problem? New pushrods might be required? Link to comment Share on other sites More sharing options...
Guest Greg Ross Posted February 12, 2009 Share Posted February 12, 2009 Interesting looking plenum on the Dome there now Hal!Sompin new? Link to comment Share on other sites More sharing options...
2seater Posted February 13, 2009 Share Posted February 13, 2009 Yes, it is a modified stock manifold. A friend of mine is a welding instructor and he did the welding. My upper radiator hose is made of welded copper, not brazed or soldered, which we also did as an experiment. The hat on top is removable and in addition to the added volume I was considering adding a small air/water intercooler inside. It's mostly an experiment. I had considered using a snakes style manifold lower intake with a big box on top, but there are too many differences in the manifold connections to make that worth the effort. The individual ports still flow within 2% of each other, so it didn't destroy the internal balance I had been working on. It certainly looks different. Link to comment Share on other sites More sharing options...
Guest Bobby Valines Posted February 14, 2009 Share Posted February 14, 2009 2seater could you put a picture of your motor on here, looks interesting. Link to comment Share on other sites More sharing options...
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