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12-18-2015, 10:23 PM
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#5 |
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Senior Member
 
Join Date: Jul 2000
Location: North Texas
Posts: 4,038
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Re: new L31 crate motor to replace 87 5.7 tbi
Hard to beat the price on the L31 crate engine. It's perfect for trucks with tall axle ratios. I considered buying one for my 82 C10, but wanted to run a mechanical fuel pump with my carbureted setup. Ended up rebuilding a 1997 L31 block and using a RamJet 350 cam, which is still fairly mild.
If you are using stock 87 exhaust manifolds, use an exhaust gasket as a template and make sure the manifolds don't block the top 3/8" of the Vortec heads' exhaust ports. Grind away some material if they do.
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Mike 1969 Custom/10 LWB -- owned for 37 years. 350/TH350, 3.08 posi, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. Hedman stainless headers. Old Air installation in progress. 1982 Custom Deluxe 10 SWB -- converted from 250-six to roller cam 350 w/ Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) which 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 26 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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