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Re: Opinions on daily driver 350 Engine Build
The GM Targetmaster/Goodwrench engine has a very mild flat tappet cam, around 195/202, 112LSA, .383"/.401" valve lift. Seems like some had .390" intake lift.
Having installed a few of them over the years, I can say they have a smooth idle and make really good torque right out of the box. Dual exhaust or a set of headers with small primaries, along with a 600cfm or smaller 4-bbl will wake up the engine and fatten up the power curve. Been there done that at least 3 times.
Actual compression as measured by magazines (and my math) is around 7.8:1. So your 60cc TF heads would bump compression up to around 9.0:1. You could also use a .028" head gasket for a little more. But I'd use whatever gaskets TF recommends.
I had always looked at an Isky cam at 208/208 on a 108 LSA, but that was with stock heads and 7.8:1 compression. With 9.0:1 you could run a cam with 110 LSA for a less overlap and a wider power band.
Guessing at head gasket thickness and how far "down the hole" the pistons are (varies from .025"-.030"), I'd say going from 75cc to 60cc chambers will get you more like 9.0:1.
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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; 04-01-2024 at 08:16 PM.
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