Add the GM Performance Parts hydraulic roller Hot cam and package, and this rascal will thump with a reasonable 400 hp and do it on pump gas. is an outstanding street engine, and while the cam specs may look conservative, with the addition of a larger 750-cfm carburetor and an Edelbrock Performer RPM Air Gap intake, we've shown that this package is capable of an outstanding 370 hp and almost 410 lb-ft of torque. That's what we're going to dive into this month.ĬonclusionRight out of the box, the GM Performance Parts 350 H.O. While we were impressed with the small-block's significant gains, we felt that a cam change would be worth even more. Those simple bolt-on changes pumped the 350 up from its stock power rating of 330 hp and 380 lb-ft of torque to a stout 377 hp and 415 lb-ft of torque. In search of more power, we added Hedman headers, an Edelbrock Performer RPM Air Gap dual-plane intake, and a 750-cfm Holley double-pumper carburetor. We began testing using the Deluxe model that comes completely outfitted with a water pump, HEI distributor, spark plugs, and a 600-cfm vacuum secondary carburetor. Last month, we introduced you to the GM Performance Parts 350 H.O. Intake: Air Flow Research FloPower RPM (An Edelbrock RPM with an AFR Logo)Ĭamshaft: Air Flow Research hydraulic, with 218/223° of duration 0.050 in. You would be close with your current cam but no cigar.Jack

The Jegs Cylinder Heads did extremely well in a Mag head shoot-out and you could substitute them for the AFR's to stay in budget but will probably have to upgrade your cam to get over 400. You would lose 10 or so HP over the cam they used but your stock cam would still put you slightly over the 400 mark. You would not notice the difference in HP with the 180 Heads and probably pick up a little torque where your stock cam would make its power. Here is a build from Ryan's Combo listing that is similar. JackĬlick to expand.Swapping the heads for a set of 180 AFR's with an Edelbrock RPM intake will probably get you to the 400 mark very easily and without even changing the cam or compression ratio. The key to making great power with the HO 350 is getting the running (Dynamic) compression correct with a better head choice. I'm not impressed and in my opinion they used the wrong choice of parts for the upgrade. Here is one build from Super Chev Mag that used IK180's, 750DP, RPM and a cam upgrade after the first results on the stock HO 330 GM Crate.

350 350 hp cam specs