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Old 07-02-2018, 10:38 AM
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Default What should I build?
I have a virgin IA IIA block and a really nice set of 68cc E Wideports, very nice victor 4500 ported to the heads,T&D 1.6 shaft rockers. Plan is to run Boost in the form of a Procharger. Either methanol or Q16. I want this block to be usable for a long time so I want rebuilds left in it.

What bore/stroke should I go with? How many CI?

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Old 07-02-2018, 10:44 AM
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What bore is the block currently? Personally i'd got 4.310bore (if that bore is possible), 4.250stroke

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Old 07-02-2018, 11:09 AM
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What bore is the block currently? Personally i'd got 4.310bore (if that bore is possible), 4.250stroke
X 2 ....no doubt!

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Old 07-02-2018, 11:09 AM
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4.310 Bore X 4" Stroke.

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Old 07-02-2018, 11:34 AM
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What bore is the block currently? Personally i'd got 4.310bore (if that bore is possible), 4.250stroke
496? Why?

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Old 07-02-2018, 11:34 AM
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4.310 Bore X 4" Stroke.
466?

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Old 07-02-2018, 11:51 AM
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Boost will make the torque 4 inch stroke will make for more RPMs alot of torque in a high RPM = greater HP .. in a apples to apples comparison.. be my guess

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Old 07-02-2018, 12:14 PM
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Unless your in need of well over 1000 hp and have the car set up to hook that power,I don't see the need for wide ports when your pressure feeding the motor!

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Old 07-02-2018, 02:47 PM
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My vote:

4.250 bore to give plenty of rebuild room and plenty of meat between cylinders.

4.00 stroke to keep more of the piston skirt up in the bore at BDC. With boost, you don't need cubes to make power.

454 cubic inches but let's call it 455 to be more Pontiac-oriented.


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Old 07-02-2018, 03:20 PM
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If I was to do it over, I would go less stroke. I have a 4.250 , I would like the 4.00 or less. You will still make plenty of power and piston skirt / wall will be better with the 4.00 stroke.

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Old 07-02-2018, 03:36 PM
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Originally Posted by Elarson View Post
My vote:

4.250 bore to give plenty of rebuild room and plenty of meat between cylinders.

4.00 stroke to keep more of the piston skirt up in the bore at BDC. With boost, you don't need cubes to make power.

454 cubic inches but let's call it 455 to be more Pontiac-oriented.


JMHO,
Eric
4.255 bore and 4" stroke is 455.0154 CI . No need to be a 454 lol.
That's what I'd want for dimensions.

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Old 07-02-2018, 03:36 PM
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If I was to do it over, I would go less stroke. I have a 4.250 , I would like the 4.00 or less. You will still make plenty of power and piston skirt / wall will be better with the 4.00 stroke.
X2.

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Old 07-02-2018, 05:46 PM
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Unless your in need of well over 1000 hp and have the car set up to hook that power,I don't see the need for wide ports when your pressure feeding the motor!
Goal is more than 1200 Hp...car will be in the chassis shop all winter. I have all of the wide port stuff and would like to use it...

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Old 07-02-2018, 06:05 PM
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The bigger ports allow more flow per psi. Somewhat like an intercooler effect.
Yep, run em if you got em!

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Old 07-02-2018, 06:19 PM
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Goal is more than 1200 Hp...car will be in the chassis shop all winter. I have all of the wide port stuff and would like to use it...
Even with the 4 inch stroke 15 psi will get you 1200. Since you are running c 16 or Meth, if you turn it up to say 25 psi I bet 1600-1800 depending on the combo.

Rich Guido just did drag week with his new turbo set up(65 GTO) to work out the bugs. Had trouble hooking with all the power and torque. He drove it 3000 miles round trip. His mph in the 1/4 was an 8 second car and that was at 10 psi. He ran in the 9's with 6 psi.

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Old 07-02-2018, 10:02 PM
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496? Why?
Lots of bore left to clean up and los of meat in cylinders for strength. Stroke is a good stroke for the block height.

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Old 07-02-2018, 10:37 PM
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Sell your block and build a Chevy... less B.S.

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Old 07-02-2018, 11:18 PM
BruceWilkie BruceWilkie is offline
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Lots of bore left to clean up and los of meat in cylinders for strength. Stroke is a good stroke for the block height.
NA or maybe N2O I'd agree.... Boosted he just doesn't need as much stroke. Yes plenty run big stroke boosted but blowers and turbos make more torque than adding stroke NA.

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Old 07-02-2018, 11:21 PM
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NA or maybe N2O I'd agree.... Boosted he just doesn't need as much stroke. Yes plenty run big stroke boosted but blowers and turbos make more torque than adding stroke NA.
Im just gave my opinion and i stand by it.

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Old 07-05-2018, 04:27 PM
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Sell your block and build a Chevy... less B.S.
My next motor will be a LS with a pair of turbos .. ..lol

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