Goodwrench Heads
10-04-2010, 07:43 AM
#1
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Goodwrench Heads I have sum goodwrench 350 heads in my el camino and i was gonna put those on my new 350 im building and since moneys kinda short i was going to get better springs and have some work done to it to flow better. But my question is wats the most I can get out of my stock heads with a slight improvement? I was also looking at roller rockers, thankx 4 tha help
10-05-2010, 06:09 PM
#2
These heads are used on the GMPP crate 290 HP 350, and I recall seeing evidence of this hitting 350 real horses with an RPM AirGap, a demon, and 1.625" long-tubes. But that's the wrong cam for these heads. Going to larger intake valves shows poor return on investment on the flow bench. Instead, buy good valves, such as the swirl-polished, stainless, undercut-stem, 1-piece versions that CP sells for $80 / set of 16, then have them back-cut. Do taper the exhaust guides, then polish the exhaust ports. Do mill them 0.030" Do use a dual-pattern cam. Comp's Nitrous Xtreme 268H with flat-tops should get you over 370 horses, and peak around 5500, with decent pull to 6000.
