[NeighborsComplaint]

Locate the secondary stamp on the heads to see what size chamber you have. Wallace Racing on this board has a handy guide here: http://www.wallaceracing.com/head1.htm

If your car has a combination of low compression heads and an aggressive camshaft, you can wind up with a lazy engine that doesn't build cylinder pressure early enough to have a strong low-end performance. In other makes, you might compensate with higher stall and lower gearing to keep the engine the "fun zone" but Pontiacs don't respond well to those methods.

If vacuum advance, carburetion and compression (static) are where they should be, then the camshaft is the culprit. A cranking compression check should confirm this.

[78w72]

Originally Posted by 78w72

... confirm what version they are by looking under the boss on the side of the heads, might need to use a mirror to see it.

http://www.wallaceracing.com/head1.htm

...

[NeighborsComplaint]

Originally Posted by 78w72

...

Yeah, I blew right by that with my tires spinning. lol

A really quick check is to throw on a vacuum gauge. If you're down in the 10" Hg area, you have a bit more cam than the compression may be able to handle.

[Vckline313]

Last time I checked idle vaccum was around 12° at 900rpm on a warm engine

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[77 TRASHCAN]

As mentioned, get a cranking PSI, go from there.
Those tires are way tall...car needs 3.73's to compensate for that...
Advance the timing a couple of degrees, see if you can get it to ping, if not try a couple more degrees, being careful..

[Vckline313]

Car has 3.73 its been stated 4 times already lol

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[77 TRASHCAN]

Originally Posted by Vckline313

Car has 3.73 its been stated 4 times already lol

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Yes, my post was a conformation of what you stated, not trying to sound like a Beavis, here......

Your hugely tall tires could probably do well with a 4 series gear, like a 4.10, and not have a lot og highway RPM.

Looking forward to more of your posts concerning your awesome car!!!

[Vckline313]

Originally Posted by 77 TRASHCAN

Yes, my post was a conformation of what you stated, not trying to sound like a Beavis, here......



Your hugely tall tires could probably do well with a 4 series gear, like a 4.10, and not have a lot og highway RPM.



Looking forward to more of your posts concerning your awesome car!!!

The tire height is only 25.6
I was under the impression that going to a 4 something gear would make my highway rpms even worse

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[PunchT37]

Originally Posted by Vckline313

The tire height is only 25.6
I was under the impression that going to a 4 something gear would make my highway rpms even worse

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You`ve got plenty of gear. So, it`s either a basic tune or a hardware tune. Did you find the version of the head casting you have?

[Vckline313]

Originally Posted by PunchT37

You`ve got plenty of gear. So, it`s either a basic tune or a hardware tune. Did you find the version of the head casting you have?

No I will look in the morning. I keep the car in storage and didn't have a chance to get out there today. I changed plugs and wires when I got the car, it's been afew months I need to pull a plug and read that as well

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[PunchT37]

Originally Posted by Vckline313

No I will look in the morning. I keep the car in storage and didn't have a chance to get out there today. I changed plugs and wires when I got the car, it's been afew months I need to pull a plug and read that as well

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Cool deal.


Back to the original question. For the money, 72cc aluminum heads will wake that thing up, even if the cam, converter, carb is not optimized. If you get a good combo together after the heads, that car will rip. You will have to get your driving skills together.

[Vckline313]

Originally Posted by PunchT37

Cool deal.


Back to the original question. For the money, 72cc aluminum heads will wake that thing up, even if the cam, converter, carb is not optimized. If you get a good combo together after the heads, that car will rip. You will have to get your driving skills together.

Who do you think I will be able to get heads from the fastest? Everyone seems to be on backorder

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[PunchT37]

Originally Posted by Vckline313

Who do you think I will be able to get heads from the fastest? Everyone seems to be on backorder

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Ain`t been shopping lately. The bigger boys will prolly get heads faster. Summit, Butler, SD Perf, etc for edel heads. Don`t forget KRE.

[lust4speed]

Originally Posted by steve25

First off, the bigger intake and exh port overall volume and minimum port area that is contained in any aftermarket Aluminum head will do nothing for increased off idle torque, so drop that possibility / notion fast!...

Fully agree. Aluminum heads will reduce low RPM torque, and the more money spent on porting will make the problem worse. Hate to see people talk the OP into spending money on aluminum heads only to have less low RPM torque.

[PunchT37]

Originally Posted by lust4speed

Fully agree. Aluminum heads will reduce low RPM torque, and the more money spent on porting will make the problem worse. Hate to see people talk the OP into spending money on aluminum heads only to have less low RPM torque.

Gimme a break. How much port volume and cfm does my daily driver 5.3 have? I know it`s OBD2. But, it doesn`t have VVT.

[NeighborsComplaint]

KRE told me 12 weeks … that was 2 weeks back. No heads in stock.

[Vckline313]

Originally Posted by NeighborsComplaint

KRE told me 12 weeks … that was 2 weeks back. No heads in stock.

Are they taking pre-orders or will it be a fcfs basis when they stock

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[Dragncar]

Originally Posted by NeighborsComplaint

KRE told me 12 weeks … that was 2 weeks back. No heads in stock.

At least they are made here and you are not waiting for some container ship from CHYNA to be unloaded in Los Angeles.
Worth the wait for Made in the USA.

[NeighborsComplaint]

Originally Posted by Vckline313

Are they taking pre-orders or will it be a fcfs basis when they stock

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Orders filled on FIFO basis once heads are cast is what I was told. While they didn't mention it, I assume they need sufficient paid-in-advance orders to proceed with a run of head castings. The 12 weeks is part estimate for minimum casting run orders to accumulate plus actual casting and machining time.

[78w72]

Originally Posted by lust4speed

Fully agree. Aluminum heads will reduce low RPM torque, and the more money spent on porting will make the problem worse. Hate to see people talk the OP into spending money on aluminum heads only to have less low RPM torque.

agreed. thats why i suggested milling the 5c or 6x he has now to up the comp to 9.5 with a good performance valve job & with the over $1k+ left compared to alum head price, changing the cam to match the comp, converter & gears. would be a better matched all around combo for street use.... & still have some $$ left over for other things or maybe some different wheels & tires?? no offense if he prefers them.

unless the plans are making a lot more HP that alum heads can support, the price doesnt really justify the performance gain, especially with an unknown cam, vs the cost of upgrading the 5c or 6x & picking a good HR or FT cam to match the rest of the combo.

again just a suggestion of a different way to increase power/tq based on the parts he has & spending less money than alum heads.