1970 Camaro L78 Heads

[mfchassisworks]

Sorry Chuck, I can't help you with an under the hood pix. I will keep my eyes open. The car is already in the registry. I just emailed Mike, I never thought of him.

Thanks Guys!

Andrew

1970 Camaro SS RS L78 4spd
1970 Camaro SS396 10.5 tire

[deuce-less]

my late 69 L-78 nova had one 291 and one 840....
my 70 L-78 camaro had 291's, i believe the camaro was an early car, the heads were dec-69 and jan 70

[CamarosRus]

My L-78 was probably in the first Norwood group, 01C.

291 Heads Here, on a Nov assembled engine

Would be interesting to hear from 70 L-78 and LS-6 Chevelle owners re: 840 heads ????

[markjohnson]

The biggest difference between those two heads is that the the exhaust valve diameters are larger on the #291 (1.88 Diam.) The #840 still had the 1.72 exhaust valves. Now somebody enlighten me as to what kind of seat is on the spark plug of the 1969 #840 heads. I thought that 1970 #291's used a short-reach, tapered seat. I've heard of several late-1969 L78 cars using a #291 cylinder head on one side and an #840 head on the other. That points towards the #840 head being phased out even before the 1969 model year was over so I would think that ALL 1970 L78 and LS6 engines used the #291's. Especially the late introduced 1970.5 Camaros.

[69 Post Sedan]

I agree with you Mark. I have seen a lot of June of 1969 built 291 heads. That means some of the late '69 cars could have gotten 291's when they ran out of the 840's.

That's a good question. If each head took a different plug, you would have to get 2 sets of plugs.
Kurt

[mfchassisworks]

I have 1 840 head that takes the newer plugs? Would that be for that NOVA application with the mixed heads?