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Re: Chevy High Performance 350- Fit or no fit?
Quote:
Originally Posted by Jake Wade
More like 7.8-7.9:1. One would be better off with the 260HP version with that paltry CR.
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I agree 100%. Cylinder pressure with the bigger cam is very low. And that means low torque and not-so-great throttle response, certainly under 2500 RPM.
I don't know what GMPP was thinking, unless they wanted a lopey idle (misfires) and didn't care about loss of torque. At least they could have selected a cam with a tighter LSA, or cylinder heads with smaller combustion chambers. I think CompCam's #12-306-4 at 206/212 on a 108 LSA would work much better than the larger GM cam. You can also get it on a 110 LSA as #12-308-4.
On another note, I have had a couple 9.0:1 to 9.3:1 engines with iron heads, Neither one needed premium gas except on very hot days with coolant temp at 200-210. Of course, quench height on both was in the .040"-.045" range. On the GM crate engines it's .060"-.070", which is more prone to detonation.
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Mike
1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
Last edited by MikeB; 02-12-2014 at 12:59 PM.
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