1970 Z28 intake, carb, heads and air cleaner find

[Furback]

Who said that 492 angle plug heads came on a 70 Z??????

[Furback]

Who said that 492 angle plug heads came on a 70 Z??????

[Furback]

Actually, 492 straight plug heads were used in late production 1970, part number 3987376, this was also the superceded part number for the discontinued "186" 1969 Z28 head. Early production 70 Z28,s/Corvettes had "186" heads before the "492" was used. The Z28 and Corvette LT1 had 2.02X1.60 valve size and screw in studs. The "492" head was also used in 350/300hp but was a 1.94X1.50 with pressed studs.
71,72 and 73 used "487" casting, it was a large chamber 2.02X1.60 on the Z28 and Corvette LT1. Low horse passenger cars also used this casting but as a 1.94X1.50 and pressed studs. A friend has some M dated 1.94 492 heads, he got them off a 300 HP Taxi.

[SuperNovaSS]

Are you having a conversation with yourself?


Jason

[Furback]

LOL, no it is a quote. Seems that way though.

[68moz28rs]

I think you should do some research. 186 heads were 1969-1970. 487 were 71+. Use some google if you want to argue. They're all over the counter. And post some pictures if you really have 492 heads with straight plugs. They didn't make them.

Brandon

[supercomp 8.90]

when did they come out with the 292 turbo head? I remember years ago seeing a set of turbo heads that a circle track racer had a machine shop turn the angle plugs into straight plug style to pass tech lol!!

[Schonyenko2]

I believe there were some 186 angle plug heads floating around. OTC only. 186 heads ran into late production LT/1s My deuce has them. Colvin's book is not always 100% correct.

We ran 292s on a small blk 406. They make a lot of power.

[x77-69z28]

I have a set of 292 angle plug heads on my 69 Z. They do make a lot of power. It is a peanut plug as well.
Buddy

[68moz28rs]

Jenkins used a set of 492s on his 331 sbc and made somewhere around 700hp. I bought the heads from Jenkins and they're in a museum. They have a huge amount of meat in them for porting and the build quality tops those other fuelie heads in my opinion. I've personally never used 292s but hear a lot of good stuff about them!

Brandon