unclenasty

Desperately in need of a pair of heads for a 1958 FI casting numbers 3748772-58X....

HALP!

427390HP

Do you mean 3748770? If so, my brother has a very nice date matched pair I think he will sell separate from a 58 engine he has.

If you're interested, send me an email to terryhaut@mchsi.com with your phone number and I'll have him call you right away.

Terry

unclenasty

Hi Terry,

I think the 770 heads are the only ones that had the X58 casting for the FI engine. I am doing some research for a customer of mine and i now believe the 772 are for the 58-61 regular passenger cars and most likely even had the 2 bbl carb.

I was trying to also find info on just what the difference was between the 770's and a 3737739 that was also used in the 283, 57-62, Corvette, FI but doesn't have the X58....

Any thoughts?

Thanks

Ben

427390HP

Ben,

There was only one head number for all 58 engines - 3748770. 3737739 was the block casting number for 58 and early 59 engines. No 57-62 Corvette engines had a 3737739 head casting number. I think you're mixing up block numbers with head numbers.

If you need a pair of heads correct for any 58 engine, whether it's a single 4BBL, dual quads, or FI, they have to be 3748770. There's no other number that would be correct. Naturally , other heads will work, but not be correct.

Terry

unclenasty

Thanks for straightening out Terry!

Top Notch!

You wouldn't know where i could find valve specs for those heads would you?

427390HP

Yes, everything you need to know is in the Service Manual.

unclenasty

Thanks again Jerry,

One last question. What do you think would cause the exhaust manifolds to get red hot within just a couple minutes of starting it up? Engine temp seems normal. Too much air getting in???....thanks a mil,,i really do appreciate it!

Ben

62corvette

[Timing way off will really heat up manifolds.QUOTE=unclenasty;1578279043]Thanks again Jerry,

One last question. What do you think would cause the exhaust manifolds to get red hot within just a couple minutes of starting it up? Engine temp seems normal. Too much air getting in???....thanks a mil,,i really do appreciate it!

Ben[/QUOTE]

relics6067

Unclenasty:

I have a set if you still need a pair. They are buried out in the shop (like everything else......) and have been for some time (like about 30 years............).

Let me know if I can help.

HTH

Rocky a

I have a set of 772-58x heads with new valves and springs

oldskydog

772 heads were never used in production on Corvettes in 58. The 772 heads were used on 2 barrel pass car engines.