Yes youngsters, there is a "Turbo" head for SBC. An over the counter only part. Part # 3965784, casting number 340292...
Gee, then why don't we just throw Low Port, Mirror Port, "Canuk's", R.Flow, 9C1's, GTZ's, SB2.2's, and maybe even them "Roll-Overs"
names at him also
That will really help answer the question he asked...
He asked a question about a single head number 3917291.
His question was;
... ive also been told that the 2.02 heads with id # 3917291 are "turbo" heads ,not sure what they ment by this?? can any one help??
I answered THAT
... There is no such thing as a '291 "Turbo Head" - these will not fit Corvairs, the only car manufactured by GM with a turbo that year...
The '291 is a 1968 (year model) casting only...
Hope this helps...
I didn't try to 'confuse the issue with facts' about what some other
GM heads are refered to - by some.
Specially some of the low-production "over-the-counter" units sold only for a few years...
I highly doubt that one GM/MTG employee's in the 70's would ever refer to those heads by that name anyway - none I ever talked to did when they were supplying me with them
Oh, btw - only
the post 1976 production '292's have the higher 'tin' alloy content (this helped with the head gasket failures by strengthening the deck section), the earlier versions don't
You also forgot to mention the need for different head bolt lengths at some locations vs. standard heads - but, folks that build performance engines would know this...
These were Chevys top racing heads until the Bowtie line came out.
Most folks building performance engines using GM heads still prefered the earlier '746' 'Raised Plug' head for high compression engines - prefering the stronger deck over smoother port flow (unported) for engine longevity.
My wife did get a kick out of the "youngsters" comment though
She told me "don't let it go to your head