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**MikeB** · 08-04-2002, 11:29 AM

Have them magnafluxed before you spend a nickle on them, and don't use them because you think they are bigger or better than 350 heads. Chevy did NOT make a performance version of the 400. It was built to make gobs of torque from idle to 2500 rpm and peak horspepower (not much) at maybe 3500 rpm. Also, the combustion chambers are 76cc, so you'd need flat-top pistons with a 350 to get 9:1 compression.

08-04-2002, 11:29 AM	#5
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,665	Have them magnafluxed before you spend a nickle on them, and don't use them because you think they are bigger or better than 350 heads. Chevy did NOT make a performance version of the 400. It was built to make gobs of torque from idle to 2500 rpm and peak horspepower (not much) at maybe 3500 rpm. Also, the combustion chambers are 76cc, so you'd need flat-top pistons with a 350 to get 9:1 compression. __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- 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 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!