[grivera]

Originally Posted by Txbobcat

Ok I am going to get some other heads for this. I dont want detonation problems or blowing the motor either. Do you guys think 98cc heads will be Ok. 4x. or do I need to try to find some 100 cc heads.. And question 2 will my power steering and alternator brackets fit onto later heads like 6x 5c or 7m5.
The 13 heads I have may be for sale. Fresh valve job and mild port job by Elliot port works. Never mounted in fact I havent even picked them up yet.

As indicated by B-Man - 6x4's would be great:

http://forums.maxperformanceinc.com/...65#post5989065

[Formulas]

I wish the 1970 455 # 64 head was more prevalent i want a set bad for my 4 inch stroke program compression wise they are in the sweet spot with simple flat tops and with large valves and screw in studs

Most people want stupid money for them if I'm going to pay 80% value of aluminum heads i will just go there

[tom s]

Done set
https://www.ebay.com/itm/Pontiac-350...frcectupt=true

[tom s]

9 to 1 with 96 CCs and zero deck and 39 head gasket.Also has all the exhaust bolt holes.Tom

[quicksilver97ta]

Bob sent me this pic of the piston.

[tom s]

OK so it it does have a dish,now you have to get all the specs and KNOW where you will be,dont GUESS!Tom

[will slow gto]

Originally Posted by tom s

Done set
https://www.ebay.com/itm/Pontiac-350...frcectupt=true

Wow, $2300 for a set of 96 heads that aren’t the Ram Air versions.

[tom s]

Like many eBay items,just reaching for someone that has to have a set.One year only head I think.Tom

[77 TRASHCAN]

Jim Hand had a set of 64's on his 473 inch wagon engine, when it was running serious 1/4 mile times. I have been to several Pontiac events he raced at and spoke at. He went into detail about the work he had to perform on those 64 heads to make them into what was needed for his engine. I don't remember all the details, but it had a lot to do with where the short angle (floor) exited into the valve opening.

I know Jim ran those heads for a while. I was thrilled when he went to 6X's because I have 6X's also. I know the 6X heads have powered the wagon to 11.40's, which is crazy!!!

I would not choose 64 heads for a 455 as first pick. They do have a proper sized combustion chamber, but other heads can work.

Jim?

[grivera]

See post 21- I provided link to ready to install set of 6x4s for $850

http://forums.maxperformanceinc.com/...65#post5989065

[77 TRASHCAN]

is it in yet?

[lust4speed]

Really, really didn't want to follow that line, but got tired of waiting for another post.

How come the stock engines I tear down the pistons are .006" to no more than.010" down in the hole, but I keep seeing .020" to .025" quoted? Just never saw a stock piston that far down on initial teardown. The distance would be true for crap aftermarket pistons, but hope people are measuring actual depth and not believing internet hearsay.

[Txbobcat]

Got some 5c heads at the shop now which will lower compression and make it a good driver. Should get them back in a week or so then install the motor.

[77 TRASHCAN]

Originally Posted by lust4speed

Really, really didn't want to follow that line, but got tired of waiting for another post.

How come the stock engines I tear down the pistons are .006" to no more than.010" down in the hole, but I keep seeing .020" to .025" quoted? Just never saw a stock piston that far down on initial teardown. The distance would be true for crap aftermarket pistons, but hope people are measuring actual depth and not believing internet hearsay.

Sorry for my rude forward push..

My take on the deck heights, in general...is that 455's are usually .005 down, in stack form, and with replacement pistons...400's are usually .020 or slightly more...not sure of 428's though.

My thinking was that the 455's were that way, because of the high wrist pin placement, and the creators used up as much territory as possible to keep the ring pack where they thought it needed to be. They even went to the trouble of using one 1/16" comp. ring...Saying all this, the 428's are not quite as squeezed together as the 455's...

[quicksilver97ta]

Bob decided to go with the 5C's which will drop his compression ratio.
The 13's are now posted for sale, asking $750 OBO.
I might have tried to run the 13's and played with the tuning but Bob didn't want to do all that and I can't say as I blame him. He wants to run regular gas if possible, tune it to spec, and otherwise not worry about it. His Catalina is a convertible and absolutely beautiful.

[Dragncar]

Run the 72cc heads and just buy the right piston. Smaller the chamber usually equals better short turn.