HTL4248AS For my 318?

[bad440]

http://www.moparmusclemagazine.com/..._0312_solid_vs_hydraulic_lifters/viewall.html

This article shows a basic example of how much extra duration and overlap is needed to create the same quality engine switching from hydraulic cam to solid cam.

The hydraulic cam used in this example as a before spec is the 231/237 XE275HL, used in several 400hp 318 buildup articles. and it's generally agreed that it's an appropriate cam for a street/strip 318.

They replaced it with a 239/247 solid cam and got identical idle vacuum and cranking pressure.

I would consider running that exact grind if it wasn't custom. I don't think I could afford to wait the turn around time in a custom cam.

However this test was done with a 440.

i have that cam in my 360 it's the 269 mm series solid,mine had 10 inches of vac but wasnt installed at 104 now it is when i fire it iwill report back

 

[rumblefish360]

Double post/fat finger sysndrome LOL

 

[rumblefish360]

The last couple of sentences in your last post I would address like this;

The comparo between the short stroke and the long stroke engines is how, where and when the power comes on and gives up on the RPM range. The longer stroke providing more torque in the low rpm range will give up power a few hundred rpm sooner than a similarly build short stroke engine.

At the top of the rpm range, the longer stroke engine has a feel like the power just noses over and gives up where the shorter stroke engine doesn't. The short stroke engines hang on to there HP at high RPM's a lot longer.

Now between the short stroke group, there going to feel the same because of the short stroke but differently due to the greater cube advantage. The power curves will be very similar.

I'd agree with you "Hopped up 10.25/340 headed 318" feeling like a 340 because it is far removed from stock. However, if you build a 340 with the same overbore and comp ratio, a stark difference you will feel and note.

 

[66dartman]

I used the Comp XE-274S solid in my .030 over 318 with "302" heads and KB-844 domed pistons for 11.3:1 compression. Was good for 13.40's here at 5800' altitude, in a 3200# car, which I roughly translated to 330 hp. Even with 4.30 gear it needed much more, maybe 5.13. Pretty soft 60' times, like 1.92-1.96. If you go with a 230& bigger cam @ .050 in a 318, gear it accordingly, and you should have 12's at your altitude