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Search: Posts Made By: jcisworthy
Forum: Street & Performance 05-06-2022, 10:10 AM
Replies: 4
Views: 2,259
Posted By jcisworthy
AMC cylinder head flow data

I have never seen a 304 head cracked.

I like to use the 086 castings if available and the exhaust side is all 3/8

Not a big deal making all exhaust threads 3/8 on the castings with four 5/16...
Forum: Street & Performance 05-04-2022, 05:44 PM
Replies: 4
Views: 2,259
Posted By jcisworthy
AMC Cylinder head Flow data

A chamber cut will help a little also
Forum: Street & Performance 05-04-2022, 05:42 PM
Replies: 4
Views: 2,259
Posted By jcisworthy
AMC Cylinder head Flow data

I like starting with the 304 heads because of the "clean slate" to work with

Little more work getting to the larger valves but good product in the end.

The cutters I have show better results on...
Forum: Street & Performance 04-22-2022, 05:11 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
LS Rockers

Update

.100" long SBC valve with an .080" lash cap or a 5.2" long valve worked out better for this engine with a zero deck and no machining to the bridge pads.

OR

Mill 0.200" off the bridge...
Forum: Street & Performance 04-12-2022, 05:29 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
LS rockers

Here is a link to pictures

https://theamcforum.com/forum/topic115071_post1003390.html#1003390
Forum: Street & Performance 04-12-2022, 05:20 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
LS rockers

Ok, pictures will not upload and I resized them twice so maybe it needs to be a postage stamp?
Forum: Street & Performance 04-12-2022, 05:16 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
LS Rockers

5.020 long 11/32 stem valves in 502 casting heads. No machining, literally a bolt on setup.

Pushrods clear the factory holes with .600 lift, no milling the factory bridge bosses, complete bolt on....
Forum: Street & Performance 03-18-2022, 06:55 AM
Replies: 79
Views: 69,497
Posted By jcisworthy
LS Rockers

Using a .5020-.5050 long or so valve and keeping the valve lift to .550-.600 looks good for a bolt on setup.
Forum: Street & Performance 03-12-2022, 04:12 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
LS Rockers

After using a valve 4.900 long and starting the sweep at the center of the valve stem, I will use a valve around 5" long in all future LS rocker arm swaps.

The LS rocker travels across the valve...
Forum: Street & Performance 12-02-2020, 05:52 AM
Replies: 18
Views: 7,330
Posted By jcisworthy
Pinging

Installing the timing chain and gears dot to dot means nothing. The only way to know if your cam timing is where you want it is by checking it with a degree wheel.

If your engine does not ping...
Forum: Street & Performance 05-17-2020, 09:52 AM
Replies: 79
Views: 69,497
Posted By jcisworthy
The engine is a 360 with 10:1 CR, street ported...

The engine is a 360 with 10:1 CR, street ported heads around 260 CFM at the lift of the cam with the 1.7's. Port matched Air gap intake, hydraulic flat tappet Bullet custom grind, 214/226 @ .050,...
Forum: Street & Performance 05-17-2020, 06:21 AM
Replies: 79
Views: 69,497
Posted By jcisworthy
LS Rockers on bridge heads

Found a couple pictures of LS rockers on a 401 I built for a customer. I have a 360 going on the dyno, should be this week, using LS rockers after the break in with factory bridge 1.6 rockers.

I...
Forum: Street & Performance 04-30-2020, 03:56 PM
Replies: 12
Views: 12,639
Posted By jcisworthy
Heads moves really good air for an 1.84 valve. I...

Heads moves really good air for an 1.84 valve. I did a lot of work on them to see how the engine would do. They were around 230 cfm at .525 and kept going to high 350's I believe.

That was with...
Forum: General FSJ Tech 08-28-2019, 06:05 AM
Replies: 5
Views: 1,362
Posted By jcisworthy
It was the fuse on the thermal relay. I fixed it...

It was the fuse on the thermal relay. I fixed it yesterday.

Thank you for the replies.
Forum: General FSJ Tech 08-17-2019, 07:29 AM
Replies: 5
Views: 1,362
Posted By jcisworthy
That relay looks like the correct one based on...

That relay looks like the correct one based on wire colors and there is no power to that relay

Is there a fusible link wire in that circuit?
Forum: General FSJ Tech 08-17-2019, 07:22 AM
Replies: 5
Views: 1,362
Posted By jcisworthy
I found one relay under the switch in easy reach...

I found one relay under the switch in easy reach and swapped a good one I had here and no power.

Not sure if that was the correct one it was the low hanging fruit I had easy access to

I will look...
Forum: General FSJ Tech 08-17-2019, 06:35 AM
Replies: 5
Views: 1,362
Posted By jcisworthy
Heater Blower Motor

No power to the blower motor switch in my 1986 J20

All fuses good, any ideas?
Forum: Street & Performance 04-28-2019, 05:23 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
Correct

Correct
Forum: Street & Performance 04-14-2019, 06:15 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
Don't expect big gains with this mod, it is just...

Don't expect big gains with this mod, it is just an excellent option when upgrading your rockers.

Not very difficult or expensive in the end.

I have pictures of a mini shaft installation but they...
Forum: Street & Performance 04-10-2019, 02:31 AM
Replies: 79
Views: 69,497
Posted By jcisworthy
Cannot beat that price. I just ordered a set...

Cannot beat that price.

I just ordered a set with trunions installed for a 360 build in the near future. I have been using mini shaft adjustable rockers but decided to go back a torque and go...
Forum: Street & Performance 04-09-2019, 01:52 AM
Replies: 79
Views: 69,497
Posted By jcisworthy
You can get the rockers with trunion upgrade...

You can get the rockers with trunion upgrade without stands on ebay for about 150 delivered I believe.

I recommend the trunion upgrade and stands are available from GM relatively cheap. It has been...
Forum: Street & Performance 04-08-2019, 12:32 PM
Replies: 12
Views: 12,639
Posted By jcisworthy
I built a similar 360 for a customer and it made...

I built a similar 360 for a customer and it made 437 hp and 458 tq at similar rpm ranges

Anyone you talk to at Bullet can help you. I take to whoever answers the phone
Forum: Street & Performance 04-07-2019, 04:45 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
They clear stock valve covers. Make sure you...

They clear stock valve covers.

Make sure you have enough distance to coil bind before doing anything. If the extra lift ends up in coil bind you will have issues.

Should have enough but it needs...
Forum: Street & Performance 04-06-2019, 12:16 PM
Replies: 79
Views: 69,497
Posted By jcisworthy
I do not remember having to slot the pushrod...

I do not remember having to slot the pushrod holes with the stock LS rocker setup but it was about five years ago when I built that engine

Trunion upgrade is not needed to about .600 lift with the...
Forum: Street & Performance 04-06-2019, 03:54 AM
Replies: 79
Views: 69,497
Posted By jcisworthy
I have a 401 engine in Australia with factory LS...

I have a 401 engine in Australia with factory LS rockers, stands, and Comp Cams trunion upgrade.

That setup is not adjustable, similar to the factory bridge rockers. That engine made 531 hp and it...
Showing results 1 to 25 of 43

 
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