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Search: Posts Made By: 68xr7cat
Forum: Engine Tech 08-20-2015, 06:35 PM
Replies: 15
Views: 599
Posted By 68xr7cat
Unless your blower is in the way of your valve...

Unless your blower is in the way of your valve covers is no reason you cannot swap valve springs. If your blower is in the way of taking off your valve covers you have have bigger problems as any...
Forum: Engine Tech 08-16-2015, 01:44 PM
Replies: 14
Views: 844
Posted By 68xr7cat
Although not common there are production blocks...

Although not common there are production blocks that would take a 4.50" bore. A 4.75" stroke is about as most in a stock height block so 604ci I'd say is possible.
Forum: Engine Tech 07-19-2015, 12:59 PM
Replies: 8
Views: 430
Posted By 68xr7cat
Did it have a second o2 sensor after the cat? If...

Did it have a second o2 sensor after the cat? If it did it will set a code if you don't have the sensors hooked up and the cats working. If it is the case you can either get the PCM reprogrammed to...
Forum: Engine Tech 07-03-2015, 06:16 PM
Replies: 9
Views: 426
Posted By 68xr7cat
Regarding pistons and rebalance if you use stock...

Regarding pistons and rebalance if you use stock replacement pistons the weights should be close enough to not need rebalance. I've seen factory stuff be 20 grams off. That all said I personally feel...
Forum: Engine Tech 07-03-2015, 06:04 PM
Replies: 9
Views: 426
Posted By 68xr7cat
When you have ridge at top of bore is first clue...

When you have ridge at top of bore is first clue bore is worn. Most wear is at top of ring travel as cylinder pressure is pushing rings into bore. The old cast iron rings wear more than then the moly...
Forum: Engine Tech 07-02-2015, 09:39 AM
Replies: 10
Views: 620
Posted By 68xr7cat
Other than the P-51 may want to also look at the...

Other than the P-51 may want to also look at the TFS street 325, Eliminator CJ, and AFR 300 (If it ever becomes available). What be best fit will depend a lot on your rules.
Forum: Engine Tech 07-01-2015, 03:31 PM
Replies: 14
Views: 508
Posted By 68xr7cat
From memory you disconnect the tsp and adjust...

From memory you disconnect the tsp and adjust idle to 525. Connect the tsp, open throttle to make sure it extends, then adjust tsp for idle speed 650. Is there so engine don't run on when you shut it...
Forum: Engine Tech 06-27-2015, 08:29 PM
Replies: 11
Views: 705
Posted By 68xr7cat
Dont know if still true but 20 years ago were...

Dont know if still true but 20 years ago were studies that found engine wear goes up a lot below 180 f.

A cold bore and a hot piston can lead to piston scuffing or seizing so always should build...
Forum: Engine Tech 06-27-2015, 08:11 PM
Replies: 47
Views: 3,354
Posted By 68xr7cat
I would not recommend a 4.5 stroker for a street...

I would not recommend a 4.5 stroker for a street car. A 4.3 stroke and 6.8 rod much better choice. I see a lot of what is out there is about selling parts not what right for an application. The 4.5...
Forum: Engine Tech 06-12-2015, 09:11 PM
Replies: 31
Views: 2,051
Posted By 68xr7cat
So tell me what the 429 SCJ was homologated for?

So tell me what the 429 SCJ was homologated for?
Forum: Engine Tech 06-12-2015, 09:08 PM
Replies: 1
Views: 127
Posted By 68xr7cat
Moroso makes a really nice set, just a bit spendy.

Moroso makes a really nice set, just a bit spendy.
Forum: Engine Tech 06-12-2015, 09:03 PM
Replies: 31
Views: 2,051
Posted By 68xr7cat
Is common to find old Chevy trucks with 4 bolt...

Is common to find old Chevy trucks with 4 bolt 350 engines. The reason as I've been told had to do with detonation issues at low RPM causing cap walk.
Forum: Engine Tech 06-12-2015, 08:52 PM
Replies: 31
Views: 2,051
Posted By 68xr7cat
Good question, but only the ones at Ford at the...

Good question, but only the ones at Ford at the time can say for sure. What I do see is that they used the 4 bolt mains in applications that would see higher RPM. If cap walk is a concern then 4 bolt...
Forum: Engine Tech 06-12-2015, 05:51 PM
Replies: 31
Views: 2,051
Posted By 68xr7cat
I doubt it. I'd say their engineering department...

I doubt it. I'd say their engineering department felt it was needed to pass their durability testing and meet warranty. Most of what gets built here see's a lot less use typically and is more narrow...
Forum: Engine Tech 06-11-2015, 08:23 PM
Replies: 31
Views: 2,051
Posted By 68xr7cat
Ford put 4 bolt mains on 370hp 429's. There is no...

Ford put 4 bolt mains on 370hp 429's. There is no single answer. Depends on application, how careful you are about not detonating it, and how reliable it has to be. I have to say I've known a Chevy...
Forum: Engine Tech 06-07-2015, 06:29 PM
Replies: 7
Views: 425
Posted By 68xr7cat
You have an experienced engine builder so why not...

You have an experienced engine builder so why not let him do his job? Tell him honestly what you goals are and what is a must have and what be nice, but not a must have. IMO that is what you should...
Forum: Engine Tech 05-27-2015, 11:37 PM
Replies: 14
Views: 680
Posted By 68xr7cat
So you saying I'm a liar? So what cu in. on the A...

So you saying I'm a liar? So what cu in. on the A head intake?
Forum: Engine Tech 05-27-2015, 11:00 PM
Replies: 14
Views: 680
Posted By 68xr7cat
With how much cu. in.? Not really. Just...

With how much cu. in.?


Not really. Just some radiusing and cleaning up any casting flash. Some of those Mafia intakes need some clean up too...



Well no kidding it is wrong. Think that is...
Forum: Engine Tech 05-27-2015, 09:13 PM
Replies: 14
Views: 680
Posted By 68xr7cat
Paper or plastic? Ported can mean different...

Paper or plastic? Ported can mean different things to different people and is a loaded question just like effects of different spacers and shear plates. Not going there.

I see the Victor and...
Forum: Engine Tech 05-27-2015, 09:02 PM
Replies: 33
Views: 1,940
Posted By 68xr7cat
For a stock application the stock seals likely...

For a stock application the stock seals likely will last longer than you will have the truck. The stock seals usually last atleast 10 years before heat and age harden them up and they start falling...
Forum: Engine Tech 05-27-2015, 08:39 PM
Replies: 14
Views: 680
Posted By 68xr7cat
Given the small cam and displacement a Victor may...

Given the small cam and displacement a Victor may be faster...
Forum: Engine Tech 05-16-2015, 02:59 PM
Replies: 18
Views: 873
Posted By 68xr7cat
All the flat tappet hydraulic lifter are about...

All the flat tappet hydraulic lifter are about the same, although some are of better quality. By a good name brand set. Why are you replacing the lifters? Are you changing the cam? If you are...
Forum: Engine Tech 05-16-2015, 01:46 PM
Replies: 47
Views: 3,354
Posted By 68xr7cat
FYI Those cometic head gaskets can be reused. ...

FYI Those cometic head gaskets can be reused.

You have as mentioned too much compression for pump gas and that octane booster does not help much. Need either race gas or race gas/pump gas mix or...
Forum: Engine Tech 05-14-2015, 07:52 PM
Replies: 25
Views: 1,119
Posted By 68xr7cat
Tight buget, 429 crank, 750 hp, nitrous. Not a...

Tight buget, 429 crank, 750 hp, nitrous. Not a good combination. You be $$$ ahead to get another block that is std. bore with a 460 crank and build on that. 460 pistons are shelf items and are a lot...
Forum: Engine Tech 05-14-2015, 07:36 PM
Replies: 288
Views: 50,928
Posted By 68xr7cat
Because that is what companies do and AFR is far...

Because that is what companies do and AFR is far from alone on this. If AFR took peoples money two years ago I'd see it different, but they did not.

Really if you guys cannot wait go buy...
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