Re: Ebay 70 Chevelle SS396 L-89 Convertible
 

Actually, I believe the aluminum heads are open chamber. Because of the already 12.5 to 1 compression ratio of the motor, and new emmission laws, a closed chamber was unnecessary. The important match up is square port vs round port on the exhaust side. The 569 intake is the low rise L78 intake manifold.

Re: Ebay 70 Chevelle SS396 L-89 Convertible
 

The more I think about it, the ZL1 experts might be able to confirm this. I think there were three applications for that 074 open chamber head in 1970- the L89, the ZL1, and the often anticipated but never produced LS7. To get back to the car, I think the parts were right and I think if the POP is valid, the car is probably right.

Re: Ebay 70 Chevelle SS396 L-89 Convertible
 

For the Chevelle SS in 1970,during the first 4 months of production,the L-78 Chevelle when optioned w/L-89 Aluminum heads used #842 closed chamber heads with 11:1 pistons,(as was carried over from 1968-69 L-78/L-89's),and used with the #569 intake Manifold...but the M-22 rock crusher was not a possibility with the 1970 L-78 or L-89 Chevelle,do to retooling/production constraints for the new 454 engine release.

The #074 Open Chamber heads were used on the larger piston 1969 ZL-1 Camaro-Corvette,1969 L88 Corvette & 1971 LS-6 Corvette.

Why has the seller ended this auction early?

Re: Ebay 70 Chevelle SS396 L-89 Convertible
 

I thought the reverse was true. Didn't they switch to the open chamber head when they phased out the 396 in late '69 and went to the 402?

Re: Ebay 70 Chevelle SS396 L-89 Convertible
 

The more high performance and rare the vehicle, the more important the paperwork.
A 250 horse 1965 Corvette has more value with the original driveline than with the original paperwork. A L89 Camaro convertible world get more value out of having the original window sticker than the original engine where as a Camaro SS 350 would have more value with its original engine than a window sticker. These are just my feelings, but the rare, high dollar cars are faked and stamped. If it has a real window sticker, it is probably what it is even if the engine is a restamp.

Re: Ebay 70 Chevelle SS396 L-89 Convertible
 

Tim G.:

Definitely agree!!! Factory paperwork is worth MORE THAN its weight in gold for sure. Especially for the rare and desireable musclecars.

My other conclusion is a "survivor" car is worth way more than a restored car, especially the internal guts of the powerplant. Once opened up, no one ever seems to rebuild them with factory original parts again.