Does the block still have the VIN stamping?

 

Below are the numbers that I have found on the engine. Where else should I look to find VIN # ?

Front engine block 399289 or3899289 (I need to verify with metal brush)
Front engine block reads T1017XCH
Right siderear engine block 125-78 Rt.
Drivers side rear engine block GM 10 T CONV

 

Besides pulling the tank to find the build sheet are there any other areas where I might find a build sheet?

 

Most Corvette build sheets were placed on top of the gas tank. Occassionally, they were placed under the seat between the springs and the foam. Those did not last very long.

 

I am going to try to drop tank sometime this week. I have heard that build sheets could be under the dash between gauges and down by kick panels. I will let you know what I find. The car does have a 6500-rpm redline tach which I understand came with the 435HP and L88 cars?

 

[align=left]Your heads come up as:
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3946074....69&71...rect...OPEN...'69 427 L88, ZL1, Aluminum, 118cc chamber
'71 454 LS6, "round exhaust port"

[align=left]I'm betting that your heads are the round exhaust port version though, since your block casting number is:

3999289....454.......71-79...2 or 4 bolt, some "CE" replacement blocks had four bolt main caps
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Looks like someone threw in an LS6 (or at least an L88 variant with LS6 heads) to me. From wikipedia:

the LS6 engine was rated at 450hp (336kW). It is generally accepted that the LS6 was substantially underrated (a common practice at the time to avoid undue attention from insurance companies) and actually produced well over 500horsepower as delivered from the factory. This notion was supported by the fact that an LS6 powered 1970 Corvette, in full street trim (including tires), was capable of accelerating from a standstill to 60 miles per hour (96 kilometers per hour) in less than four seconds, and covering a standing quarter-mile in little more than 12 seconds. Top speed was well over 160 miles per hour (256 kilometers per hour).

A 465hp (347kW) and 490ft·lbf (664N·m) version of the 454, dubbed LS7, was also produced, but was only available as a stand-alone or dealer-installed engine. Actually capable of some 600 horsepower when optimally tuned, the LS7 was probably the most powerful production automobile engine ever manufactured in the USA.
Power began falling off after 1970, with the 1971 LS5 producing 365hp (272kW) and 465ft·lbf (630N·m), and the LS6 option coming in at 425hp (317kW) and 475ft·lbf (644N·m). Only the LS5 remained in 1972, when SAE net power ratings and the move towards emission compliance resulted in to 270hp (201kW) and 390ft·lbf (529N·m). The 1973 LS4 produced 275hp (205kW) and 390ft·lbf (529N·m), with 5hp (4kW) and 10ft·lbf (14N·m) gone the following year. 1974 was the last year of the 454 in the Corvette.

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Hey all a few more questions:

How I can identify the trans as a M22 Rock Crusher? Someone who looked at the car said that was what is under the car.
Numbers I found on the trans are the following:

3925660 located on pass side
US Patent 3088336 General Motors Corp
Back of tranny reads Vertical P9H10A

The L89 aluminum heads that were produced did these heads come with the L71 427 435 HP motor?

Any idea what the heads and tranny(if M22 Rock Crusher) are worth?

Any input would beGREAT !!!!!

 

The M22 aka rock crusher sounds like a truck transmission in its low, low gear (granny). In other words it is noisy because it has straight cut gears because the are stronger than helical cut gears which most manual trans use.

The aluminum heads were an option on the 427/435 engine.

Might look on eBay or check Hemmings for worth.