will a cam swap work?



will a cam swap work?

Postby grumpyvette » November 17th, 2014, 7:38 pm

I bought a '71 LT-1 rolling chassis. Great shape, Red interior, Red paint. I also just found a '71 L-48 hydraulic engine that had .30 over 9:1s installed 16,000 miles ago at the rebuild. Love the crackle of a solid motor through the headers and side pipes. Can I just drop in a stock mechanical cam / lifter set and approximate an LT-1 for sound and general performance? I'm hearing some trusted ones say yes. But other trusted ones say valve springs...need a tiebreaker.


I hear questions like this all to frequently , so lets step back and look at this from my perspective as a guy who builds serious engines, you can,t make "a silk purse out of a sows ear" THERES virtually no parts directly interchange between the two engines.....yes they can be physically swapped and will bolt on, but they are NOT the same!
now IM not saying you can,t swap to screw in rocker studs and a solid lifter cam and new solid lifters but the low 9:1 compression and smaller port heads etc. WILL REDUCE performance noticeably, and the longer duration cam won,t run well at the lower compression ratio
the LT1 engine had different components,you can't take a significantly lower compression engine with pressed in rocker studs ,smaller valves, smaller ports a different combustion chamber,different pistons, cast crank and weak rods an inferior oil system, a restrictive intake manifold, two bolt block, ETC. and just swap cam, lifters and maybe valve springs and expect it to run in a similar manor
he LT-1 was the ultimate 350 cu in (5.7 L) V8, becoming available in 1970. It used solid lifters, 11:1 compression, a high-performance camshaft, and a 780 CFM Holley four-barrel carburetor on a special aluminum intake with ramhorn exhaust manifolds and a low-restriction exhaust to produce a factory rated 370 hp (276 kW) (the NHRA rated it at 425 hp for classification purposes) and 380 lb·ft (515 N·m). Redline was 6500 rpm but power fell off significantly past 6200 rpm.

The LT-1 was available on the Corvette and Camaro Z28.


READ THIS LINK
http://www.superchevy.com/how-to/vemp-1008-1970-gm-350-small-block-engine/

Power was down in 1971 to 330 hp (246 kW) and 360 lb·ft (488 N·m) with 9:1 compression, and again in 1972 (the last year of the LT-1, now rated using net, rather than gross, measurement) to 255 hp (190 kW) and 280 lb·ft (380 N·m).

just swapping cams and expecting the same result would be about like grabbing the l48 represented here by this picture
Image

and swapping the shoes between the two,
and expecting the LT1 represented HERE! [/color]

Image
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: will a cam swap work?

Postby 87vette81big » November 17th, 2014, 8:01 pm

Crane.
Crower.
Isky.
Must Run on pump gas.
Dedicated High Octane Race Fuel Build Ok but limited street driving.
Track use only be best then.
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Re: will a cam swap work?

Postby philly » November 17th, 2014, 11:18 pm

race gas gets expensive for a frequent driver or cruiser, better keep it safe of 91=93 whatever your state has
-phil

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