OK, thanks for the info. According to that write-up, it says "Introduction of the 4P code to L30/M20 is believed to have started in the time frame of late December 1966 to early January." Since firehoseman's car was built the first week of January, determining the 4P designation as SS350 or not is teeteringon the fence between definite and maybe! I would use the style of engine mounts as the determining factor.

 

I'm Thinking i would have to look at other things. First off im not disputing that his car is an ss at all merely coversing on the possibilites.I havent seen any pic's of deck stamp for his motor or a vin to match it too. Also havent seen a good pic of the tag or firewall area so I can say ya or na on anything pertaining to fire's car.This is an example of a few thing's id be looking for ....The owner still needs to determine where the speedometer cable comes through the firewall. One more thing to look for is the brake valve on the drivers side of the subframe. Here is a link to what I am talking about: http://www.camaros.org/brake-valve-67CSM.jpgI also have a 67 completely original 350 ss fully documented 37k actual .The documentation also has a recall for motor mount's that keept breaking causing the throttle to stick wide open. I have the recall letter and the fix it pictures as well.My point there is most likely he dont have original mount's.I am still searching for documentation on what you have said about difference in the mount's for an ss no luck so far ?here are a couple of pic's to what i am refering to

 

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Car Original paint also never touched good 10 footer still

 

and this is what the 4p is refering to "not the motor size" the 4p was on many different model's from the Lm20(which is also a sought after model)to z28's and also big block car's The 4p designation definetly belong's on desirable car's

 

M.M., I don't want to mislead you and send you off on a wild goose chase.I do know for a fact that there was a difference in frame mounts (not motor mounts) in the 69 model. In addition to the markings, they werealso a lower profile mount to allow formore hood clearance. Possibly 67 didn't have a special one for the SS 350/Z28?
Oh, and nice car by the way!

 

INST these the motor mount's you are refering to ? "M.M., I don't want to mislead you and send you off on a wild goose chase.I do know for a fact that there was a difference in frame mounts (not motor mounts) in the 69 model. In addition to the markings, they werealso a lower profile mount to allow formore hood clearance. Possibly 67 didn't have a special one for the SS 350/Z28?
Oh, and nice car by the way! Thanks on the compliment . I am confussed on this are we talking about the mounts that the engine sit on which connect them to the frame? if so those are engine/motor mounts. What i show in the pics is the GM way of fixing a bad motor/engine mount design that repeatidely failed

 

No, I'm referring to the engine frame bracket that bolts to the frame, and the motor mount bolts to that. In the picture you can see (I hope) the 4 dimples on top, and it's also a lower profile than what was used in the other small block cars. This style was unique to the SS350 & Z/28, at least for 69.
That GM installed mount fix you showis interesting, like what the racers would do to limit travel. At least it's better than wedging a block of wood between the air cleaner and hood!

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